|                                                                                      
|--------------------------------------------------------------------------------------
|UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549                 
|                                                                                      
|                                                                                      
|FORM 10-Q                                                                             
|                                                                                      
|                                                                                      
|QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934
|                                                                                      
|For the quarterly period ended March 31, 2006                                         
|                                                                                      
|Commission file number:  0-12668                                                      
|                                                                                      
|                                                                                      
|Hills Bancorporation                                                                  
|                                                                                      

|Incorporated in Iowa | I.R.S. Employer IdentificationNo. 42-1208067
|-------------------- | --------------------------------------------
|                     |                                             

|131 MAIN STREET, HILLS, IOWA 52235
|----------------------------------
|                                  
|Telephone number: (319) 679-2291  

|                                                                                                                                                                                                                                                                                                                                                       
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                       
|Indicate by checkmark whether the Registrant (1) has filed all reports required to be filed by Section
13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter
period that the registrant was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.
|xYes o No                                                                                                                                                                                                                                                                                                                                              

|                                                                                                                                                                                                                                              
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Indicate by checkmark whether the Registrant is a large accelerated filer, an accelerated filer, or
a non-accelerated filer. See definition of accelerated filer and large accelerated filer
in Rule 12b-2 of the Exchange Act. (Check one):
|Large accelerated filer _____ Accelerated Filerx Non-accelerated filer _____                                                                                                                                                                  

|                                                                                                                           
|---------------------------------------------------------------------------------------------------------------------------
|Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act). YesoNox   
|                                                                                                                           
|APPLICABLE ONLY TO CORPORATE ISSUERS:                                                                                      
|                                                                                                                           
|Indicate the number of shares outstanding of each of the issuers classes of common stock, as
of the latest practical date.
|                                                                                                                           

|CLASS                      |  | SHARES OUTSTANDINGAt April 30, 2006
|-------------------------- |  | -----------------------------------
|                           |  |                                    
|                           |  |                                    
|Common Stock, no par value |  | 4,559,350                          

|Page 1 of 30
|------------



|HILLS BANCORPORATIONIndex to Form 10-Q
|--------------------------------------
|                                      

|Part I               
|---------------------
|FINANCIAL INFORMATION
|                     
|                     
|                     
|Item 1.              
|                     
|                     
|                     
|                     
|                     
|                     
|                     
|                     
|Item 1A.             
|                     
|Item 2.              
|                     
|Item 3.              
|                     
|Item 4.              
|                     
|Part II              
|OTHER INFORMATION    
|                     
|Item 1.              
|                     
|Item 2.              
|                     
|Item 3.              
|                     
|Item 4.              
|                     
|Item 5.              
|                     
|Item 6.              
|                     
|Signatures           
|                     
|Exhibits Index       
|                     

|Page 2 of 30
|------------



|HILLS BANCORPORATIONCONSOLIDATED BALANCE SHEETS
(Amounts In Thousands, Except Shares)
|-------------------------------------------------------------------------------------
|                                                                                     

|ASSETS                                                                                                                                             |  | March 31, 2006
      (Unaudited) |           |  
|-------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------------- | --------- | -
|                                                                                                                                                  
|                                                                                                                                                   |  |                                  |           |  
|Cash and due from banks                                                                                                                            |  | $                                | 28,333    |  
|Federal funds sold                                                                                                                                 |  |                                  | 8,214     |  
|                                                                                                                                                   | 
|Total cash and cash equivalents                                                                                                                    |  | $                                | 36,547    |  
|Investment securities:                                                                                                                             |  |                                  |           |  
|Available for sale at fair value (amortized cost March 31, 2006 $198,736;
     December 31, 2005 $199,673)                                         |  |                                  | 195,159   |  
|Held to maturity at amortized cost (fair value March 31, 2006 $224;
     December 31, 2005 $225)                                                   |  |                                  | 215       |  
|Stock of Federal Home Loan Bank                                                                                                                    |  |                                  | 12,020    |  
|Loans held for sale                                                                                                                                |  |                                  | 2,804     |  
|Loans, net                                                                                                                                         |  |                                  | 1,173,421 |  
|Property and equipment, net                                                                                                                        |  |                                  | 22,069    |  
|Tax credit real estate                                                                                                                             |  |                                  | 7,418     |  
|Accrued interest receivable                                                                                                                        |  |                                  | 9,331     |  
|Deferred income taxes                                                                                                                              |  |                                  | 7,422     |  
|Goodwill                                                                                                                                           |  |                                  | 2,500     |  
|Other assets                                                                                                                                       |  |                                  | 3,349     |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  | $                                | 1,472,255 |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  |                                 
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                               |  |                                 
|                                                                                                                                                  
|                                                                                                                                                   |  |                                 
|Liabilities                                                                                                                                        |  |                                  |           |  
|Noninterest-bearing deposits                                                                                                                       |  | $                                | 143,360   |  
|Interest-bearing deposits                                                                                                                          |  |                                  | 932,131   |  
|                                                                                                                                                   | 
|Total deposits                                                                                                                                     |  | $                                | 1,075,491 |  
|Short-term borrowings                                                                                                                              |  |                                  | 32,921    |  
|Federal Home Loan Bank borrowings                                                                                                                  |  |                                  | 223,161   |  
|Accrued interest payable                                                                                                                           |  |                                  | 2,328     |  
|Other liabilities                                                                                                                                  |  |                                  | 8,526     |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  | $                                | 1,342,427 |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  |                                 
|Redeemable Common Stock Held by Employee Stock
   Ownership Plan (ESOP)                                                                            |  | $                                | 21,128    |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  |                                  |           |  
|STOCKHOLDERS EQUITY                                                                                                                               |  |                                  |           |  
|Capital stock, no par value; authorized 10,000,000 shares;
     issued March 31, 2006 4,563,476 shares; December 31, 2005 4,563,637 
       shares |  | $                                |          |  
|Paid in capital                                                                                                                                    |  |                                  | 11,985    |  
|Retained earnings                                                                                                                                  |  |                                  | 120,243   |  
|Accumulated other comprehensive income (loss)                                                                                                      |  |                                  | (2,209    | )
|Treasury stock at cost (March 31, 2006 4,126 shares;
     December 31, 2005 1,400 shares)                                                          |  |                                  | (191      | )
|                                                                                                                                                   | 
|                                                                                                                                                   |  | $                                | 129,828   |  
|Less maximum cash obligation related to ESOP shares                                                                                                |  |                                  | 21,128    |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  | $                                | 108,700   |  
|                                                                                                                                                   | 
|                                                                                                                                                   |  | $                                | 1,472,255 |  
|                                                                                                                                                   | 

|                                               
|-----------------------------------------------
|* Derived from audited financial statements.   
|See Notes to Consolidated Financial Statements.

|Page 3 of 30
|------------



|HILLS BANCORPORATIONCONSOLIDATED STATEMENTS OF INCOME (Unaudited)
(Amounts In Thousands, Except Per Share Amounts)
|------------------------------------------------------------------------------------------------------------------
|                                                                                                                  

|                                                    | Three Months Ended
      March 31, |  
|--------------------------------------------------- | ---------------------------------- | -
|                                                    |                                   
|
|                                                   
|Interest income:                                    |                                    |  
|Loans, including fees                               |                                    | $
|Investment securities:                              |                                    |  
|Taxable                                             |                                    |  
|Nontaxable                                          |                                    |  
|Federal funds sold                                  |                                    |  
|                                                    |                                   
|Total interest income                               |                                    | $
|                                                    |                                   
|Interest expense:                                   |                                    |  
|Deposits                                            |                                    | $
|Short-term borrowings                               |                                    |  
|FHLB borrowings                                     |                                    |  
|                                                    |                                   
|Total interest expense                              |                                    | $
|                                                    |                                   
|Net interest income                                 |                                    | $
|Provision for loan losses                           |                                    |  
|                                                    |                                   
|Net interest income after provision for loan losses |                                    | $
|                                                    |                                   
|Other income:                                       |                                    |  
|Net gain on sale of loans                           |                                    | $
|Trust fees                                          |                                    |  
|Service charges and fees                            |                                    |  
|Rental revenue on tax credit real estate            |                                    |  
|Other noninterest income                            |                                    |  
|                                                    |                                   
|                                                    |                                    | $
|                                                    |                                   
|Other expenses:                                     |                                    |  
|Salaries and employee benefits                      |                                    | $
|Occupancy                                           |                                    |  
|Furniture and equipment                             |                                    |  
|Office supplies and postage                         |                                    |  
|Advertising and business development                |                                    |  
|Outside services                                    |                                    |  
|Rental expenses on tax credit real estate           |                                    |  
|Other noninterest expense                           |                                    |  
|                                                    |                                   
|                                                    |                                    | $
|                                                    |                                   
|Income before income taxes                          |                                    | $
|Federal and state income taxes                      |                                    |  
|                                                    |                                   
|Net income                                          |                                    | $
|                                                    |                                   
|                                                    |                                    |  
|Earnings per share:                                 |                                    |  
|Basic                                               |                                    | $
|Diluted                                             |                                    |  

|                                               
|-----------------------------------------------
|See Notes to Consolidated Financial Statements.

|Page 4 of 30
|------------



|HILLS BANCORPORATIONCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
(Amounts In Thousands)
|------------------------------------------------------------------------------------------------------
|                                                                                                      

|                                                                                                            | Three Months Ended
      March 31, |  
|----------------------------------------------------------------------------------------------------------- | ---------------------------------- | -
|
|
|                                                                                                           
|                                                                                                           
|Net income                                                                                                  |                                    | $
|                                                                                                            |                                   
|                                                                                                           
|Other comprehensive income (loss):                                                                          |                                    |  
|Unrealized holding losses arising during the period,
         net of income taxes, 2006 ($264); 2005 ($937) |                                    |  
|                                                                                                            |                                   
|                                                                                                           
|Comprehensive income                                                                                        |                                    | $
|                                                                                                            |                                   

|                                               
|-----------------------------------------------
|See Notes to Consolidated Financial Statements.

|Page 5 of 30
|------------



|HILLS BANCORPORATIONCONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (Unaudited)
(Amounts In Thousands, Except Share Amounts)
|----------------------------------------------------------------------------------------------------------------------------
|                                                                                                                            

|                                                          | Paid In
      Capital |   | Retained
      Earnings |   | Accumulated 
      Other 
      Comprehensive
      Income (Loss) |         | Maximum 
      Cash 
      Obligation
      Related 
      To ESOP 
      Shares |   | Treasury
      Stock |   | Total |        
|--------------------------------------------------------- | --------------------- | - | ----------------------- | - | ----------------------------------------------------------------- | ------- | -------------------------------------------------------------------------------- | - | -------------------- | - | ----- | -------
|                                                         
|Balance, December 31, 2005                                |                       | $ | 11,970                  |   | $                                                                 | 119,989 |                                                                                  | $ | (1,783               | ) | $     | (20,634
|Issuance of 536 shares of
                 common stock   |                       |   | 26                      |   |                                                                   |        |                                                                                  |   |                     |   |       |       
|Forfeiture of 697 shares of
                 common stock |                       |   | (22                     | ) |                                                                   |        |                                                                                  |   |                     |   |       |       
|Shared-based compensation                                 |                       |   | 11                      |   |                                                                   |        |                                                                                  |   |                     |   |       |       
|Change related to ESOP shares                             |                       |   |                        |   |                                                                   |        |                                                                                  |   |                     |   |       | (494   
|Net income                                                |                       |   |                        |   |                                                                   | 3,949   |                                                                                  |   |                     |   |       |       
|Cash dividends ($.81 per share)                           |                       |   |                        |   |                                                                   | (3,695  | )                                                                                |   |                     |   |       |       
|Purchase of 2,276 shares of
         common stock         |                       |   |                        |   |                                                                   |        |                                                                                  |   |                     |   |       |       
|Other comprehensive income (loss)                         |                       |   |                        |   |                                                                   |        |                                                                                  |   | (426                 | ) |       |       
|                                                          |                      
|Balance, March 31, 2006                                   |                       | $ | 11,985                  |   | $                                                                 | 120,243 |                                                                                  | $ | (2,209               | ) | $     | (21,128
|                                                          |                      
|                                                          |                       |   |                         |   |                                                                   |        
|                                                          |                       |   |                         |   |                                                                   |         |                                                                                  |   |                      |   |       |        
|Balance, December 31, 2004                                |                       | $ | 11,364                  |   | $                                                                 | 108,199 |                                                                                  | $ | 576                  |   | $     | (16,336
|Change related to ESOP shares                             |                       |   |                        |   |                                                                   |        |                                                                                  |   |                     |   |       | (449   
|Net income                                                |                       |   |                        |   |                                                                   | 4,143   |                                                                                  |   |                     |   |       |       
|Cash dividends ($.75 per share)                           |                       |   |                        |   |                                                                   | (3,413  | )                                                                                |   |                     |   |       |       
|Other comprehensive income (loss)                         |                       |   |                        |   |                                                                   |        |                                                                                  |   | (1,594               | ) |       |       
|                                                          |                      
|Balance, March 31, 2005                                   |                       | $ | 11,364                  |   | $                                                                 | 108,929 |                                                                                  | $ | (1,018               | ) | $     | (16,785
|                                                          |                      
|                                                          |                       |   |                         |   |                                                                   |        

|                                               
|-----------------------------------------------
|See Notes to Consolidated Financial Statements.

|Page 6 of 30
|------------



|HILLS BANCORPORATIONCONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
(Amounts In Thousands)
|--------------------------------------------------------------------------------------------
|                                                                                            

|                                                                                                | Three Months Ended 
      March 31, |     
|----------------------------------------------------------------------------------------------- | ----------------------------------- | ----
|                                                                                                |                                    
|                                                                                                |                                     | 2006
|                                                                                               
|Cash Flows from Operating Activities                                                            |                                     |     
|Net income                                                                                      |                                     | $   
|Adjustments to reconcile net income to net cash
              provided by operating activities: |                                     |     
|Depreciation                                                                                    |                                     |     
|Provision for loan losses                                                                       |                                     |     
|Share-based compensation                                                                        |                                     |     
|Compensation expensed through issuance of common stock                                          |                                     |     
|Provision for deferred income taxes                                                             |                                     |     
|Increase in accrued interest receivable                                                         |                                     |     
|Amortization of discount on investment securities, net                                          |                                     |     
|Decrease in other assets                                                                        |                                     |     
|Increase in accrued interest and other liabilities                                              |                                     |     
|Loans originated for sale                                                                       |                                     |     
|Proceeds on sales of loans                                                                      |                                     |     
|Net gain on sales of loans                                                                      |                                     |     
|                                                                                                |                                    
|Net cash provided by operating activities                                                       |                                     | $   
|                                                                                                |                                    
|                                                                                                |                                    
|Cash Flows from Investing Activities                                                            |                                     |     
|Proceeds from maturities of investment securities
         available for sale                   |                                     | $   
|Purchases of investment securities available for sale                                           |                                     |     
|Loans made to customers, net of collections                                                     |                                     |     
|Purchases of property and equipment                                                             |                                     |     
|Investment in tax credit real estate, net                                                       |                                     |     
|                                                                                                |                                    
|Net cash used in investing activities                                                           |                                     | $   
|                                                                                                |                                    
|                                                                                                |                                    
|Cash Flows from Financing Activities                                                            |                                     |     
|Net increase in deposits                                                                        |                                     | $   
|Net decrease in short-term borrowings                                                           |                                     |     
|Forfeiture of common stock                                                                      |                                     |     
|Purchase of treasury stock                                                                      |                                     |     
|Dividends paid                                                                                  |                                     |     
|                                                                                                |                                    
|Net cash provided by financing activities                                                       |                                     | $   
|                                                                                                |                                    

|           
|-----------
|(Continued)

|Page 7 of 30
|------------



|HILLS BANCORPORATION
          CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)(Continued)(Amounts In Thousands)
|-----------------------------------------------------------------------------------------------------------------
|                                                                                                                 

|                                                | Three Months Ended
      March 31, |       
|----------------------------------------------- | ---------------------------------- | ------
|
|
|                                               
|                                                |                                    |       
|Increase in cash and cash equivalents           | $                                  | 6,591 
|                                                |                                    |       
|Cash and due from banks:                        |                                    |       
|Beginning of year                               |                                    | 29,956
|                                                |                                   
|End of period                                   | $                                  | 36,547
|                                                |                                   
|                                                |                                    |       
|Supplemental Disclosures                        |                                    |       
|Cash payments for:                              |                                    |       
|Interest paid to depositors                     | $                                  | 5,943 
|Interest paid on other obligations              |                                    | 3,206 
|Income taxes paid (received)                    |                                    | 357   
|                                                |                                    |       
|Noncash financing activities:                   |                                    |       
|Increase in maximum cash obligation related to  |                                    |       
|ESOP shares                                     | $                                  | 494   
|                                                |                                    |       
|See Notes to Consolidated Financial Statements. |                                    |       

|Page 8 of 30
|------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Unaudited)
|-------------------------------------------------------------------------
|                                                                         

|Note 1. | Basis of Presentation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|        | The accompanying unaudited consolidated financial statements have been prepared in accordance with
accounting principles generally accepted in the United States of America for interim financial reporting
and with instructions for Form 10-Q and Regulation S-X. These financial statements include all adjustments
(consisting of normal recurring accruals) which in the opinion of management are considered necessary
for the fair presentation of the financial position and results of operations for the periods shown.
Certain prior year amounts may be reclassified to conform to the current year presentation. The Company
considers that it operates as one business segment, a commercial bank.
|        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|        | Operating results for the three-month period ended March 31, 2006 are not necessarily indicative of
the results that may be expected for the fiscal year ending December 31, 2006. For further information,
refer to the consolidated financial statements and footnotes thereto included in the Form 10-K Annual
Report of Hills Bancorporation and subsidiary (the Company) for the year ended December
31, 2005 filed with the Securities Exchange Commission on March 10, 2006.                                                                                                                                                                                                                           
|        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Note 2. | Earnings Per Share                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

| | Basic earnings per share amounts are computed by dividing net income (the numerator) by the weighted
average number of common shares outstanding (the denominator) during the period. Diluted per share
amounts assume the conversion, exercise or issuance of all potential common stock equivalents unless
the effect is to reduce the loss or increase the income per common share from continuing operations.
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |                                                                                                                                                                                                                                                                                                                                                                                                                  
| | The computation of basic and diluted earnings per share for the periods presented is as follows:                                                                                                                                                                                                                                                                                                                 
| |                                                                                                                                                                                                                                                                                                                                                                                                                  

| | Three months ended 
      March 31,                                                                                                     |  
| | --------------------------------------------------------------------------------------------------------------------------------------- | -
| |                                                                                                                                         |  
|
| |                                                                                                                                         |  
| |                                                                                                                                         |  
| | Common shares outstanding at the beginning of the period                                                                                |  
| | Weighted average number of net shares redeemed                                                                                          |  
| |                                                                                                                                         |  
| | Weighted average shares outstanding (basic)                                                                                             |  
| | Weighted average of potential dilutive shares
     attributable to stock options granted, computed under
     the treasury stock method |  
| |                                                                                                                                         |  
| | Weighted average number of shares (diluted)                                                                                             |  
| |                                                                                                                                         |  
| |                                                                                                                                         |  
| | Net income (In Thousands)                                                                                                               | $
| |                                                                                                                                         |  
| |                                                                                                                                         |  
| | Earnings per share:                                                                                                                     |  
| | Basic                                                                                                                                   | $
| |                                                                                                                                         |  
| | Diluted                                                                                                                                 | $
| |                                                                                                                                         |  

|Page 9 of 30
|------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)(Unaudited)
|-------------------------------------------------------------------------------------
|                                                                                     

|Note 3. | Recent Accounting Pronouncements
|------- | --------------------------------
|        |                                 

|As of January 1, 2006, the Company adopted Statement of Financial Accounting Standards (SFAS) No. 123
(revised 2004), Share-Based Payment (FAS 123R) which requires companies to recognize in compensation expense the grant-date fair value
of stock awards issued to employees and directors. The Company adopted FAS 123R using the modified
prospective transition method. In accordance with the modified prospective transition method, the
Companys Consolidated Financial Statements for prior periods have not been restated to reflect
the impact of FAS 123R. As a result of applying FAS 123R, the Company recognized share-based compensation
expense of $11,000 for the three months ended March 31, 2006 (see Note 4.)
In March 2004, the Emerging Issues Task Force (EITF) revisited EITF Issue No. 03-1,The Meaning of Other-Than-Temporary Impairment and its Application of Certain Investments. Effective with reporting periods beginning after June 15, 2004, companies carrying certain types
of debt and equity securities at amounts higher than the securities fair market values would
have to use more detailed criteria to evaluate whether to record a loss and would have to disclose
additional information about unrealized losses. The FASB subsequently issued a staff position deferring
the effective date of the measurement and recognition provisions of the revised EITF No. 03-1
until further implementation issues may be resolved. On November 3, 2005, the FASB issued a Staff
Position (FSP) that addresses the determination as to when an investment is considered impaired,
whether that impairment is other than temporary, and the measurement of an impairment loss. This
FSP also includes accounting considerations subsequent to the recognition of an other-than-temporary
impairment and requires certain disclosures about unrealized losses that have not been recognized
as other-than-temporary impairments. The guidance in the FSP shall be applied to reporting
periods beginning after December 15, 2005. Adoption of the new issuance could have a material impact
on the Companys financial position and results of operations but the extent of any impact will
vary due to the fact that the model, as issued, calls for many judgments and additional evidence
gathering as such evidence exists at each securities valuation date.
In December 2004, the FASB issued FASB Statement No. 153,Exchanges of Nonmonetary Assets, which eliminates an exception in APB 29 for recognizing nonmonetary exchanges of similar productive
assets at fair value and replaces it with an exception for recognizing exchanges of nonmonetary assets
at fair value that do not have commercial substance. This Statement is effective for the Company
for nonmonetary asset exchanges occurring on or after January 1, 2006. The adoption of this Statement
will not have a significant effect on the Companys financial statements.
In May 2005, the FASB issued FASB Statement No. 154,Accounting Changes and Error Corrections. Statement 154 establishes, unless impracticable, retrospective application as the required method
for reporting a change in accounting principle in the absence of explicit transition requirements
specific to a newly adopted accounting principle. The Company implemented the provisions of this
statement as of January 1, 2006 and it did not have a significant effect on its financial statements.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 10 of 30
|-------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)(Unaudited)
|-------------------------------------------------------------------------------------
|                                                                                     

|Note 4. | Employee Benefit Plans
|------- | ----------------------
|        |                       

|The Company has a Stock Option and Incentive Plan for certain key employees and directors whereby shares
of common stock have been reserved for awards in the form of stock options or restricted stock awards.
Under the plan, the aggregate number of options and shares granted cannot exceed 198,000 shares.
A Stock Option Committee may grant options at prices equal to the fair value of the stock at the
date of the grant. Options expire 10 years from the date of the grant. Directors may exercise options
immediately and officers rights under the plan vest over a five-year period from the date of
the grant. Prior to January 1, 2006, the Company accounted for the stock options under the recognition
and measurement principles of Accounting Principles Board (APB) Opinion No. 25, Accounting for Stock Issued to Employees.
On January 1, 2006, the Company adopted FAS 123R, which requires the measurement and recognition of
compensation expense for all stock-based awards made to employees and directors. The Company adopted
FAS 123R using the modified prospective transition method. The Consolidated Financial Statements
as of and for the three months ended March 31, 2006 reflect the impact of FAS 123R. In accordance
with the modified prospective transition method, the Consolidated Financial Statements for prior
periods have not been restated.
Information concerning the issuance of stock options is presented in the following table:
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

|                                      | Options |        | Weighted-
      Average
      Exercise Price |   | Weighted-
      Average 
      Remaining
      Contractual 
      Term (years) |  | Aggregate
      Intrinsic Value
      (In Thousands) |     
|------------------------------------- | ------- | ------ | -------------------------------------------- | - | ------------------------------------------------------------------------------ |  | ---------------------------------------------------- | ----
|                                     
|Outstanding at March 31, 2006         |         | 62,619 |                                              |   | 26.69                                                                          |  |                                                      | 5.59
|                                     
|Options exercisable at March 31, 2006 |         | 44,019 |                                              | $ | 25.27                                                                          |  |                                                      | 4.52
|                                     

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|The fair value of each option is estimated as of the date of grant using a Black-Scholes option pricing model. The expected lives of options granted incorporate historical employee exercise behavior. The risk-free rate for periods that coincide with the expected life of the options is based on the annual 10 year interest rate swap rate as published by the Federal Reserve Bank. Expected volatility is based on volatility levels of the Companys peers common stock as the Companys stock has limited trading activity. Expected dividend yield was based on a set dividend rate.
      At March 31, 2006, 119,579 shares were available for issuance under the plan. No stock options were granted or exercised during the three months ended March 31, 2006.
    As of March 31, 2006, there was 70,000 in unrecognized compensation cost for stock options granted under the Plan. This cost is expected to be recognized over a weighted-average period of 1.18 years.

|Page 11 of 30
|-------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)(Unaudited)
|-------------------------------------------------------------------------------------
|                                                                                     

|Note 4. | Employee Benefit Plans (continued)
|------- | ----------------------------------
|        |                                   

|The results for the first quarter of 2006 are not directly comparable to the same period in 2005. Prior to the adoption of FAS 123R, the Company applied the existing accounting rules under APB Opinion No. 25, which provided that no compensation expense was charged for options granted at an exercise price equal to the market value of the underlying common stock on the date of the grant. If the fair value recognition provisions of FAS 123R had been applied to stock-based compensation for the three months ended March 31, 2005, the Companys pro forma net income and earnings per share would have been as follows:
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

| | Three months ended
      March 31, 2005                                                                                                              |  
| | ---------------------------------------------------------------------------------------------------------------------------------------------------- | -
| |                                                                                                                                                      |  
| | Net income:                                                                                                                                          |  
| | As reported                                                                                                                                          | $
| |                                                                                                                                                      |  
| | Deduct total stock-based employee compensation expense
     determined under fair value based method for all awards,
     net of related tax effects |  
| |                                                                                                                                                      |  
| | Pro forma                                                                                                                                            | $
| |                                                                                                                                                      |  
| |                                                                                                                                                      |  
| | Basic earnings per share:                                                                                                                            |  
| | As reported                                                                                                                                          | $
| |                                                                                                                                                      |  
| | Pro forma                                                                                                                                            | $
| |                                                                                                                                                      |  
| |                                                                                                                                                      |  
| | Diluted earnings per share:                                                                                                                          |  
| | As reported                                                                                                                                          | $
| |                                                                                                                                                      |  
| | Pro forma                                                                                                                                            | $
| |                                                                                                                                                      |  

|        |                         
|------- | ------------------------
|Note 5. | Stock Repurchase Program
|        |                         

|In July of 2005, the Companys Board of Directors approved a stock repurchase program pursuant to which the Company may repurchase 750,000 shares of its common stock from time to time through December 31, 2009. Pursuant to this authorization, the Company has purchased 4,126 shares of its common stock in privately negotiated transactions from August 1, 2005 through March 31, 2006. Of these 4,126 shares, 2,726 shares were purchased during the quarter ended March 31, 2006, at an average price per share of $46.87.
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

|Note 6. | Commitments and Contingencies
|------- | -----------------------------
|        |                              

|The Companys subsidiary, Hills Bank and Trust (the Bank) is a party to financial
instruments with off-balancesheet risk in the normal course of business to meet the financing
needs of its customers. These financial instruments include commitments to extend credit, credit
card participations and standby letters of credit. These instruments involve, to varying degrees,
elements of credit risk in excess of the amount of the amount recognized in the consolidated balance
sheets.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 12 of 30
|-------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)(Unaudited)
|-------------------------------------------------------------------------------------
|                                                                                     

|Note 6. | Commitments and Contingencies (continued)
|------- | -----------------------------------------
|        |                                          

|The Banks exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit, credit card participations and standby letters of credit is represented by the contractual amount of those instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. A summary of the Banks commitments at March 31, 2006 and December 31, 2005 is as follows:
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

| | March 31, 2006                                               |   |       
| | ------------------------------------------------------------ | - | ------
|
| | (Amounts In Thousands)                                      
| | Firm loan commitments and unused portion of lines of credit: |   |       
| | Home equity loans                                            | $ | 17,188
| | Credit card participations                                   |   | 26,820
| | Commercial, real estate and home construction                |   | 78,341
| | Commercial lines                                             |   | 84,229
| | Outstanding letters of credit                                |   | 9,625 

|         |             
|-------- | ------------
|Item 1A. | Risk Factors
|         |             

|There have been no material changes from the risk factors disclosed in the Companys Annual Report on Form 10-K for the year ended December 31, 2005.
|-----------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                     

|Item 2. | Managements Discussion and Analysis of Financial Condition
    And Results of Operations
|------- | -----------------------------------------------------------------------------------------
|        |                                                                                          

|The following is managements discussion and analysis of the financial condition of Hills Bancorporation
(Hills Bancorporation or the Company) and its banking subsidiary Hills Bank
and Trust Company (the Bank) for the dates and periods indicated. The discussion should
be read in conjunction with the consolidated financial statements and the accompanying footnotes.
Special Note Regarding Forward Looking Statements
This report contains, and future oral and written statements of the Company and its management may
contain, forward-looking statements within the meaning of such term in the Private Securities Litigation
Reform Act of 1995 with respect to the financial condition, results of operations, plans, objectives,
future performance and business of the Company. Actual results may differ materially from those included
in the forward-looking statements. Forward-looking statements, which may be based upon beliefs, expectations
and assumptions of the Companys management and on information currently available to management,
are generally identifiable by the use of words such as believe, expect, anticipate,
plan, intend, estimate, may, will, would,
could, should or other similar expressions. Additionally, all statements
in this document, including forward-looking statements, speak only as of the date they are made,
and the Company undertakes no obligation to update any statement in light of new information or future events.
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 13 of 30
|-------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)(Unaudited)
|-------------------------------------------------------------------------------------
|                                                                                     

|Item 2. | Managements Discussion and Analysis of Financial Condition
    And Results of Operations (continued)
|------- | -----------------------------------------------------------------------------------------------------
|        |                                                                                                      

|The Companys ability to predict results or the actual effect of future plans or strategies is
inherently uncertain. Factors which could have a material adverse effect on the operations and future
prospects of the Company include, but are not limited to, the following:
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                             

| |  | The strength of the United States economy in general and the strength of the local economies in which
the Company conducts its operations which may be less favorable than expected and may result in,
among other things, a deterioration in the credit quality and value of the Companys assets.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |   |                                                                                                                                                                                                                                                                                                    
| |  | The effects of, and changes in, laws, regulations and policies affecting banking, securities, insurance
and monetary and financial matters as well as any laws otherwise affecting the Company.                                                                                                    
| |   |                                                                                                                                                                                                                                                                                                    
| |  | The effects of changes in interest rates (including the effects of changes in the rate of prepayments
of the Companys assets) and the policies of the Board of Governors of the Federal Reserve System.                                                                                           
| |   |                                                                                                                                                                                                                                                                                                    
| |  | The ability of the Company to compete with other financial institutions as effectively as the Company
currently intends due to increases in competitive pressures in the financial services sector.                                                                                                
| |   |                                                                                                                                                                                                                                                                                                    
| |  | The ability of the Company to obtain new customers and to retain existing customers.                                                                                                                                                                                                               
| |   |                                                                                                                                                                                                                                                                                                    

| |  | The timely development and acceptance of products and services, including products and services offered
through alternative delivery channels such as the Internet.                                                                             
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |   |                                                                                                                                                                                                                                                 
| |  | Technological changes implemented by the Company and by other parties, including third party vendors,
which may be more difficult or more expensive than anticipated or which may have unforeseen consequences
to the Company and its customers.
| |   |                                                                                                                                                                                                                                                 
| |  | The ability of the Company to develop and maintain secure and reliable electronic systems.                                                                                                                                                      
| |   |                                                                                                                                                                                                                                                 

| |  | The ability of the Company to retain key executives and employees and the difficulty that the Company
may experience in replacing key executives and employees in an effective manner.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |   |                                                                                                                                                                                       
| |  | Consumer spending and saving habits which may change in a manner that affects the Companys business
adversely.                                                                       
| |   |                                                                                                                                                                                       
| |  | The economic impact of terrorist attacks and military actions.                                                                                                                        
| |   |                                                                                                                                                                                       

| |  | Business combinations and the integration of acquired businesses and assets which may be more difficult
or expensive than expected.
| | - | -----------------------------------------------------------------------------------------------------------------------------------
| |   |                                                                                                                                    
| |  | The costs, effects and outcomes of existing or future litigation.                                                                  
| |   |                                                                                                                                    

| |  | Changes in accounting policies and practices, as may be adopted by state and federal regulatory agencies
and the Financial Accounting Standards Board.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------
| |   |                                                                                                                                                       
| |  | The ability of the Company to manage the risks associated with the foregoing as well as anticipated.                                                  

|Page 14 of 30
|-------------



|HILLS BANCORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)(Unaudited)
|-------------------------------------------------------------------------------------
|                                                                                     

|Item 2. | Managements Discussion and Analysis of Financial Condition
    And Results of Operations (continued)
|------- | -----------------------------------------------------------------------------------------------------
|        |                                                                                                      

|These risks and uncertainties should be considered in evaluating forward-looking statements and undue
reliance should not be placed on such statements. Additional information concerning the Company and
its business, including other factors that could materially affect the Companys financial results,
is included in the Companys filings with the Securities and Exchange Commission.
Critical Accounting Policy
The Companys financial statements are prepared in accordance with accounting principles generally
accepted in the United States of America. The financial information contained within these statements
is, to a significant extent, financial information that is based on approximate measures of the financial
effects of transactions and events that have already occurred. Based on its consideration of accounting
policies that involve the most complex and subjective decisions and assessments, management has identified
its most critical accounting policies to be those which are related to the allowance for loan losses.
The Companys allowance for loan loss methodology incorporates a variety of risk considerations,
both quantitative and qualitative in establishing an allowance for loan loss that management believes
is appropriate at each reporting date. Quantitative factors include the Companys historical
loss experience, delinquency and charge-off trends, collateral values, changes in non-performing
loans, and other factors. Quantitative factors also incorporate known information about individual
loans, including borrowers sensitivity to interest rate movements. Qualitative factors include
the general economic environment in the Companys markets, including economic conditions throughout
the Midwest and in particular, the state of certain industries. Size and complexity of individual
loans in relation to loan structure, existing loan policies and pace of portfolio growth are other
qualitative factors that are considered in the methodology. As the Company adds new products and
increases the complexity of its loan portfolio, it will enhance its methodology accordingly. This
discussion and analysis should be read in conjunction with the Companys financial statements
and the accompanying notes presented elsewhere herein, as well as the Managements Discussion
and Analysis of Financial Condition and Results of Operation that is included. Although management
believes the levels of the allowance as of March 31, 2006 and December 31, 2005 were adequate to
absorb probable losses inherent in the loan portfolio, a decline in local economic conditions, or
other factors, could result in increasing losses that cannot be reasonably predicted at this time.
Overview
The Company is a holding company engaged in the business of commercial banking. The Companys
subsidiary is Hills Bank and Trust Company, Hills, Iowa (the Bank), which is wholly owned.
The Bank was formed in Hills, Iowa in 1904. The Bank is a full-service commercial bank extending
its services to individuals, businesses, governmental units and institutional customers primarily
in the communities of Hills, Iowa City, Coralville, North Liberty, Mount Vernon, Kalona, Cedar Rapids
and Marion, Iowa. At March 31, 2006 the Bank has twelve full service locations.
Net income for the period ended March 31, 2006 was $3.95 million compared to $4.14 million for the
first quarter of 2005, a decrease of 4.68%. The decrease in net income is due primarily to the increase
the provision for loan losses of $644,000 that was offset by an increase in net interest income of
$343,000. Return on average equity was 14.48% and return on average equity net of ESOP obligation
was 12.15% for the three months ended March 31, 2006, compared to 16.07% and 13.84%, respectively,
for the same period in 2005. Return on average assets was 1.09% in 2006 compared to 1.26% in 2005.
Dividends of $.81 per share were paid in January 2006 to 1,499 shareholders. The 2006 dividend was
an 8.0% increase over the prior years dividend of $.75.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 15 of 30
|-------------



|HILLS BANCORPORATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Item 2.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|The Banks net interest income is the largest component of revenue and it is a function of the
      average earnings assets and the net interest margin percentage. For the period ended March 31, 2006,
      the Bank achieved a net interest margin of 3.41% compared to 3.68% in 2005. The reduction in the
      margin was expected and the overall net interest income has increased due to the higher volume of
      earnings assets in the first quarter of 2006 compared to 2005.
    Highlights noted on the balance sheet as of March 31, 2006 for the Company included the following:
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

| | Net loans are $1.173 billion.                                                              
|- | -------------------------------------------------------------------------------------------
|  |                                                                                            
| | Loan growth of $33.81 million and deposit growth of
$39.08 million since December 31, 2005.
|  |                                                                                            

|A detailed discussion of the financial position and results of operations follows this overview.
Financial Position
The asset growth of $38.6 million included a net loan increase of $33.8 million and an increase in
federal funds sold of $8.2 million. Since December 31, 2005, the federal funds target rate has been
raised by the Federal Reserve Open Market Committee twice by .25%, from 4.25% to 4.75%. The upward
movement of the federal funds target rate started on June 30, 2004 when the rate was 1.00% and created
opportunities for consumers to place funds with institutions offering higher interest rates. Interest
rates on loans are generally affected by these increases since interest rates determined by the U.S.
Treasury market rates normally increase when the Federal Reserve Board raises the federal funds target
rate. In pricing of loans and deposits, the Bank considers the U.S. Treasury indexes for benchmarks
in determining interest rates. Loans secured by real estate accounted for $23.1 million or 68% of
the increase in loans. Increases in the interest rates may at some point significantly reduce loan
demand and slow the economy, but at the current interest rate levels, demand for loans remains good.
The overall economy in the Companys principal market area, Johnson and Linn Counties, remains
good with unemployment levels that remain low.
The tables below set forth the composition of the loan portfolio as of March 31, 2006 and December
31, 2005 (dollars in thousands), along with changes in the allowance for loan losses and non-performing
loan information:
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

|                               | March 31, 2006         |           |  | December 31, 2005 |       
|------------------------------ | ---------------------- | --------- |  | ----------------- | ------
|
|
|
|(Amounts In Thousands)         | (Amounts In Thousands)
|                              
|Agricultural                   | $                      | 43,320    |  |                   | 3.64  
|Commercial and financial       |                        | 102,020   |  |                   | 8.58  
|Real estate:                   |                        |           |  |                   |       
|Construction                   |                        | 85,918    |  |                   | 7.22  
|Mortgage                       |                        | 926,862   |  |                   | 77.92 
|Loans to individuals           |                        | 31,451    |  |                   | 2.64  
|                               |                        |           |  |                   |       
|                               | $                      | 1,189,571 |  |                   | 100.00
|Less allowance for loan losses |                        | 16,150    |  |                   |       
|                               |                        |           |  |                   |       
|                               | $                      | 1,173,421 |  |                   |       
|                               |                        |           |  |                   |       

|                                                                                                                                                                                                                                                                                                                                                                                                                 
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|The Bank has an established formal loan origination policy. In general, the loan origination policy
attempts to reduce the risk of credit loss to the Bank by requiring that, among other things, maintenance
of minimum loan to value ratios, evidence of appropriate levels of insurance carried by borrowers
and documentation of appropriate types and amounts of collateral and sources of expected payment.

|Page 16 of 30
|-------------



|HILLS BANCORPORATION                                                                                  
|------------------------------------------------------------------------------------------------------
|                                                                                                      
|Item 2.                                                                                               
|                                                                                                      
|Changes in the allowance for loan losses for the periods shown in the following table were as follows:
|                                                                                                      

| |                               | Three Months Ended 
      March 31, |        |     
| | ----------------------------- | ----------------------------------- | ------ | ----
| |                               |                                     |       
| |                               | 2006                                |        | 2005
| |                               |                                     |       
| |                               | (Amounts In Thousands)              |        |     
|
| | Balance, beginning            | $                                   | 15,360 |     
| | Provision charged to expenses |                                     | 655    |     
| | Recoveries                    |                                     | 500    |     
| | Loans charged off             |                                     | (365   | )   
| |                               |                                     |       
| | Balance, ending               | $                                   | 16,150 |     
| |                               |                                     |       

|                                                                                        
|----------------------------------------------------------------------------------------
|Non-performing loan information at March 31, 2006 and December 31, 2005, was as follows:
|                                                                                        

| |                                                   | March 31, 2006         |        | December 31, 2005 |   |       
| | ------------------------------------------------- | ---------------------- | ------ | ----------------- | - | ------
| |                                                   |                        |        |                   |   |       
| |                                                   | (Amounts in thousands) |        |                  
|
| | Non-accrual loans                                 | $                      | 1,226  |                   | $ | 175   
|
| | Accruing loans past due ninety days or more       |                        | 3,063  |                   |   | 1,910 
|
| | Restructured loans                                |                        |       |                   |   |      
|
| | Non-performing loans (includes non-accrual loans) |                        | 15,808 |                   |   | 16,602

|                                                                                                                                                                                                                                                                                                                                                          
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Federal funds sold increased from zero at December 31, 2005 to $8.2 million at March 31, 2006. Deposit
growth of $39.1 million exceeded the funds required for loan growth and some were invested on a temporary
basis in federal funds sold. It is expected that some or all of the funds will be used to fund loan
growth in the second quarter of 2006.

|Page 17 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 2.             
|                    

|The estimated fair value of the investment securities held by the Company decreased by $1.6 million
        from March 31, 2005 to March 31, 2006. The market value of securities available for sale was $3.6
        million less than the amortized cost of such securities as of March 31, 2006. This is a decline of
        $690,000 in market value since December 31, 2005. The carrying values of investment securities for
    March 31, 2006 and December 31, 2005 are summarized in the following table (dollars in thousands):
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

|                              | March 31, 2006 |         |         | December 31, 2005 |       
|----------------------------- | -------------- | ------- | ------- | ----------------- | ------
|                              |                |         |        
|                              | Amount         |         | Percent |                   | Amount
|                              |                |         |        
|Securities available for sale |                |         |         |                   |       
|                              |                |         |         |                   |       
|U.S. Government agencies      |                |         |         |                   |       
|and corporations              | $              | 114,869 |         |                   | 58.86 
|                              |                |         |        
|State and political           |                |         |         |                   |       
|subdivisions                  |                | 80,290  |         |                   | 41.14 
|                              |                |         |        
|                              |                |         |         |                   |       
|Total securities              |                |         |         |                   |       
|available for sale            | $              | 195,159 |         |                   | 100.00
|                              |                |         |        
|                              |                |         |        
|Securities held to maturity,  |                |         |         |                   |       
|State and political           |                |         |         |                   |       
|subdivisions                  | $              | 215     |         |                   | 100.00
|                              |                |         |        

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Deposit growth was $39.1 million in the first quarter of 2006 and included a $37.5 million increase
in public funds that are temporary deposits. This large increase due to public funds is consistent
with the first quarter of 2005 when they increased $36.7 million. As a result of the deposit growth,
federal funds purchased included in short-term borrowings at December 31, 2005 were reduced $6.8
million to zero and federal funds sold increased $8.2 million. In the opinion of the Companys
management, the Company continues to have sufficient liquidity resources available to fund expected
additional loan growth.
Dividends and Equity
In January 2006, Hills Bancorporation paid a dividend of $3,695,000 or $.81 per share, an 8.0% increase
from the $.75 per share paid in January 2005. After payment of the dividend and the adjustment for
accumulated other comprehensive income, stockholders equity as of March 31, 2006 totaled $108.7
million. Under risk-based capital rules, the total amount of risk-based capital as of March 31, 2006,
was 13.49% of risk-adjusted assets, and is substantially in excess of the required minimum of 8.00%.
Risk-based capital was 13.84% and 13.80% as of March 31 and December 31, 2005, respectively.

|Page 18 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 2.             
|                    

|Net Income Overview
      Net income decreased $194,000 or 4.68% for the three months ended March 31, 2006 compared to the first
        quarter of 2005. Total net income was $3,949,000 in the 2006 quarter and $4,143,000 in the comparable
    2005 quarter. The changes from the first quarter in 2005 were primarily the result of the following:
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                       

| | Net interest income increased $343,000.             
|- | ----------------------------------------------------
|  |                                                     
| | The provision for loan losses increased by $644,000.
|  |                                                     
| | Other income increased by $400,000.                 
|  |                                                     
| | Other expenses increased $405,000.                  
|  |                                                     
| | Income taxes decreased $112,000.                    
|  |                                                     

|For the three-month periods ended March 31, 2006 and 2005, basic earnings per share were $.87 and $.91,
respectively. Diluted earnings per share were $.86 for the three months ended March 31, 2006 compared
to $.91 for the same period in 2005.
Quarterly fluctuations in the Companys net income continue to be driven primarily by three important
factors. The first important factor is the interaction between changes in net interest margin and
changes in average earning assets. Net interest income of $11.1 million for the first three months
of 2006 was derived from the Companys $1.366 billion of average earning assets and its net
interest margin of 3.41%. Average earning assets in 2005 were $1.223 billion and the net interest
margin was 3.68%. The margin compression was the result of the continued flattening of the yield
curve and pricing pressure on short-term deposits. The reduction in the margin was expected and the
overall net interest income has increased due to the higher volume of earnings assets in the first
quarter of 2006 compared to 2005. The importance of net interest margin is illustrated by the fact
that a decrease in the net interest margin of 10 basis points to 3.31% would have resulted approximately
in a $337,000 decrease in income before income taxes for the three-month period ended March 31, 2006.
Similarly, an increase in the net interest margin of 10 basis points to 3.51% would have resulted
approximately in a $337,000 increase in interest income before taxes. Despite the decline in the
net interest margin, net interest income for the Company increased due to the additional volume of
earning assets over the similar three-month period in 2005.
The second significant factor affecting the Companys net income is the provision for loan losses.
The majority of the Companys interest-earning assets are in loans outstanding, which amounted
to more than $1.192 billion at March 31, 2006. The provision adjustment is computed on a quarterly
basis and is a result of managements determination of the quality of the loan portfolio. The
provision reflects a number of factors including the size of the loan portfolio, loan concentrations,
the level of non-performing loans (which includes non-accrual loans) and loans past due 90 days or
more. The provision for loan losses was $655,000 in 2006 compared to $11,000 in 2005.
The amount of mortgage loans sold on the secondary market is the third factor that can cause fluctuations
in net income. In the quarters ended March 31, 2006 and 2005, the net gain on sale of loans was $154,000
and $238,000, respectively. The sale of loans is influenced by the real estate market and interest
rates. The decrease in the gain on sale of loans was expected because many customers had taken advantage
of lower interest rates in the prior three years to refinance loans.
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 19 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 2.             
|                    

|Net Interest Income
Net interest income is the excess of the interest and fees received on interest-earning bearing assets
over the interest expense of the interest-bearing liabilities. The factors that have the greatest
impact on net interest income are the volume of average earning assets and the net interest margin.
The net interest margin for the first three months of 2006 was 3.41% compared to 3.68% in 2005 for
the same period. The measure is shown on a tax-equivalent basis using a tax rate of 35% to make the
interest earned on taxable and non-taxable assets more comparable. The change in average balances
and average rates between years and the effect on the net interest income on a tax equivalent basis
for the three months ended in 2006 compared to 2005 are shown in the following table:
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

|                                 | Change in 
    Average Balance |         |   | Change in 
       Average Rate |       |   | Increase (Decrease) in Net Interest Income |  
|-------------------------------- | ------------------------------ | ------- | - | ------------------------------ | ----- | - | ------------------------------------------ | -
|
|
|                                 |                                |         |   |                                |       |   |                                            |  
|                                
|                                 | (Amounts in Thousands)         |        
|                                
|Interest income:                 |                                |         |   |                                |       |   |                                            |  
|                                 |                                |         |   |                                |      
|Loans, net                       | $                              | 153,754 |   |                                | 0.30  | % |                                            | $
|Taxable securitities             |                                | (12,858 | ) |                                | 0.05  |   |                                            |  
|Nontaxable securities            |                                | 5,414   |   |                                | 0.13  |   |                                            |  
|Federal funds sold               |                                | (4,087  | ) |                                | 1.31  |   |                                            |  
|                                 |                                |         |   |                                |       |   |                                            |  
|                                 | $                              | 142,223 |   |                                |       |   |                                            | $
|                                 |                                |         |   |                                |       |   |                                            |  
|                                 |                                |         |   |                                |      
|                                
|Interest expense:                |                                |         |   |                                |       |   |                                            |  
|Interest-bearing demand deposits | $                              | (5,106  | ) |                                | 0.23  |   |                                            | $
|Savings deposits                 |                                | (1,630  | ) |                                | 0.71  |   |                                            |  
|Time deposits                    |                                | 58,179  |   |                                | 0.78  |   |                                            |  
|Short-term borrowings            |                                | 21,519  |   |                                | 2.34  |   |                                            |  
|FHLB borrowings                  |                                | 55,618  |   |                                | (0.35 | ) |                                            |  
|                                 |                                |         |   |                                |       |   |                                            |  
|                                 | $                              | 128,580 |   |                                |       |   |                                            | $
|                                 |                                |         |   |                                |       |   |                                            |  
|Change in net interest income    |                                |         |   |                                |       |   |                                            | $
|                                 |                                |         |   |                                |       |   |                                            |  

|                                                              
|--------------------------------------------------------------
|A summary of the net interest spread and margin is as follows:
|                                                              

| | (Tax Equivalent Basis)                                                                                       | 2006 |      | 2005 |  |     
| | ------------------------------------------------------------------------------------------------------------ | ---- | ---- | ---- |  | ----
| |                                                                                                              |      |      |      | 
|
| | Yield on average interest-earning assets                                                                     |      | 6.12 | %    |  | 5.78
| | Rate on average interest-bearing liabilities                                                                 |      | 3.17 |      |  | 2.48
| |                                                                                                              |      |      |      |  |     
| | Net interest spread                                                                                          |      | 2.95 | %    |  | 3.30
| | Effect of noninterest-bearing funds                                                                          |      | 0.46 |      |  | 0.38
| |                                                                                                              |      |      |      |  |     
| | Net interest margin (tax equivalent interest income
             divided by average interest-earning assets) |      | 3.41 | %    |  | 3.68
| |                                                                                                              |      |      |      |  |     

|Page 20 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 2.             
|                    

|Provision for Loan Losses
The provision for loan losses was $655,000 in 2006 compared to $11,000 in 2005. The provision adjustment
is computed on a quarterly basis and is a result of managements determination of the quality
of the loan portfolio. The provision reflects a number of factors, including the size of the loan
portfolio, loan concentrations, the level of non-performing loans (which includes non-accrual loans)
and loans past due ninety days or more. The provision for loan losses increased in the first quarter
of 2006 as a result of the growth in the overall loan portfolio and an increase in watch and problem
loans of approximately $750,000 for the quarter. In contrast, in the quarter ended March 31, 2005,
the watch and problem loans decreased by $50,000. The large increase in 2006 is attributable to two
factors. One factor was managements determination that there had been a deterioration in the
quality of two commercial loans in the first quarter of 2006. The other factor was the overall growth
of net loans of $33.8 million compared to a smaller increase of $17.5 million in the first quarter
of 2005. The methodology used in 2006 is consistent with 2005. The allowance for loan losses balance
is also affected by the charge-offs, net of recoveries, for the periods presented. For the quarters
ended March 31, 2006 and 2005, recoveries were $500,000 and $252,000, respectively; and charge-offs
were $365,000 in 2006 and $303,000 in 2005.
The allowance for loan losses totaled $16,150,000 at March 31, 2006 compared to $15,360,000 at December
31, 2005. The allowance represented 1.35% and 1.33% of outstanding loans at March 31, 2006 and December
31, 2005, respectively. The allowance was based on managements consideration of a number of
factors, including loan concentrations, loans with higher credit risks (primarily agriculture loans
and spec real estate construction) and overall increases in net loans outstanding.
Net Gain on Sale of Loans
Net gain on sale of loans for the three months ended March 31, 2006 was $154,000 compared to $238,000
for the comparable period ended March 31, 2005. The number of loans sold in 2005 was approximately
79% of the volume in 2005. The decrease in the volume of loans was expected because many consumers
had taken advantage of lower interest rates in the prior three years to refinance loans.
Other Income
Service fees on deposit accounts increased $293,000 in 2006 of which $246,000 was primarily the result
of new fee income strategies implemented in September 2005. Debit card interchange fees increased
during the same period by $71,000 due to volume of activity. Trust fees were up $110,000 as of March
31, 2006 compared to 2005 and are the result of assets under management increasing from $690.6 million
to $800.0 million at March 31, 2006.
Other Expenses
Other expenses increased $405,000 in 2006 to $8,122,000 from the same period in 2005. This increase
of 5.25% included $327,000 in salaries and benefits. Direct salary expense was up $215,000 due to
additional employees in 2006 compared to 2005 and annual salary adjustments. Medical expense for
employees health insurance increased $38,000 due to premium increases of 12%. Outside services
increased $97,000 and the change is attributed primarily to debit card processing charges of $20,000
due to the increased volume of activity and the loss on sale of other real estate owned of $41,000.
Income Taxes
Federal and state income tax expenses were $1,794,000 and $1,906,000 for the three months ended March
31, 2006 and 2005, respectively. Income taxes as a percentage of income before taxes were 31.24%
in 2006 and 31.51% in 2005. The amount of tax credits in 2006 was $140,000, compared to $169,000
in 2004.
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 21 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 2.             
|                    

|Liquidity
The Company actively monitors and manages its liquidity position with the objective of maintaining
sufficient cash flows to fund operations, meet client commitments, take advantage of market opportunities
and provide a margin against unforeseeable liquidity needs. Federal funds sold and investment securities
available for sale are readily marketable assets. Maturities of all investment securities are managed
to meet the Companys normal liquidity needs, to respond to market changes or to adjust the
Companys interest rate risk position. Federal funds sold and investment securities available
for sale comprised 13.81% of the Companys total assets at March 31, 2006, compared to 13.73%
at December 31, 2005.
The Company has historically maintained a stable deposit base and a relatively low level of large deposits,
which has mitigated the volatility in the Companys liquidity position. As of March 31, 2006,
the Company had borrowed $223.2 million from the Federal Home Loan Bank (FHLB) of Des
Moines. The amount of advances from the FHLB of Des Moines is unchanged from December 31, 2005. These
advances were used as a means of providing both long and short-term, fixed-rate funding for certain
assets and for managing interest rate risk. The Company had additional borrowing capacity available
from the FHLB of approximately $183.5 million at March 31, 2006.
As additional sources of liquidity, the Company has the ability to borrow up to $10 million from the
Federal Reserve Bank of Chicago, and has lines of credit with two banks totaling $116.4 million.
Those two lines of credit require the pledging of investment securities when drawn upon. The combination
of high levels of potentially liquid assets, low dependence on volatile liabilities and additional
borrowing capacity provided sources of liquidity for the Company which management considered sufficient
at March 31, 2006.
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 22 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 3.             
|                    

|Market Risk Management
The Companys primary market risk exposure is to changes in interest rates. The Companys
asset/liability management, or its management of interest rate risk, is focused primarily on evaluating
and managing net interest income given various risk criteria. Factors beyond the Companys control,
such as market interest rates and competition, may also have an impact on the Companys interest
income and interest expense. In the absence of other factors, the Companys overall yield on
interest-earning assets will increase, as will its cost of funds on its interest-bearing liabilities
when market interest rates increase over an extended period. Conversely, the Companys yields
and cost of funds will decrease when market rates decline. The Company is able to manage these swings
to some extent by attempting to control the maturity or rate adjustments of its interest-earning
assets and interest-bearing liabilities over given periods.
Asset/Liability Management
The Bank maintains an asset/liability committee, which meets at least quarterly to review the Banks
interest rate sensitivity position and to review various strategies as to interest rate risk management.
In addition, the Bank uses a simulation model to review various assumptions relating to interest
rate movement. The model attempts to limit rate risk even if it appears the Banks asset and
liability maturities are perfectly matched and a favorable interest margin is present.
In order to minimize the potential effects of adverse material and prolonged increases or decreases
in market interest rates on the Companys operations, management has implemented an asset/liability
program designed to mitigate the Companys interest rate sensitivity. The program emphasizes
the origination of adjustable rate loans, which are held in the portfolio, the investment of excess
cash in short or intermediate term interest-earning assets, and the solicitation of savings or transaction
deposit accounts, which are less sensitive to changes in interest rates and can be re-priced rapidly.
Net interest income should decline as interest rates increase, while net interest income should increase
as interest rates decline. Generally, during periods of increasing interest rates, the Companys
interest rate sensitive liabilities would re-price faster than its interest rate sensitive assets
causing a decline in the Companys interest rate spread and margin. This would tend to reduce
net interest income because the resulting increase in the Companys cost of funds would not
be immediately offset by an increase in its yield on earning assets. In times of decreasing interest
rates, fixed rate assets could increase in value and the lag in re-pricing of interest rate sensitive
assets could be expected to have a positive effect on the Companys net interest income.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 23 of 30
|-------------



|HILLS BANCORPORATION
|--------------------
|                    
|Item 4.             
|                    

|The Company carried out an evaluation, under the supervision and with the participation of the Companys
management, including the Companys Chief Executive Officer and Chief Financial Officer, of
the effectiveness of the design and operation of the Companys disclosure controls and procedures
as defined in the Securities Exchange Act of 1934 Rule 13a-15(f). Based upon that evaluation, the
Companys Chief Executive Officer and Chief Financial Officer concluded that the Companys
disclosure controls and procedures are effective in recording, processing, summarizing and reporting,
on a timely basis, information required to be disclosed by the Company in the reports it files with
the Securities and Exchange Commission. There have been no changes in the Companys internal
controls over financial reporting during the first quarter of 2006 that have materially affected,
or are reasonably likely to affect materially, the Companys internal controls over financial reporting.
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Page 24 of 30
|-------------



|HILLS BANCORPORATIONPART II - OTHER INFORMATION                                                                                                                                                     
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                    
|Item 1.                                                                                                                                                                                             
|                                                                                                                                                                                                    
|                                                                                                                                                                                                    
|                                                                                                                                                                                                    
|Item 2.                                                                                                                                                                                             
|                                                                                                                                                                                                    
|The following table sets forth information about the Companys stock purchases, all of which were
    made pursuant to the 2005 Stock Repurchase Program, for the three months ended March 31, 2006:
|                                                                                                                                                                                                    

|Period                    | Total number of 
      shares purchased |  | Average price
      paid per share |       | Total number of shares 
      purchased as part of
      publicly announced 
      plans or programs |       | Maximum number of 
      shares that may yet be
      purchased under the 
      plans or programs (1) |        
|------------------------- | --------------------------------------- |  | ---------------------------------- | ----- | ---------------------------------------------------------------------------------------------------- | ----- | ------------------------------------------------------------------------------------------------------ | -------
|                         
|January 1 to January 31   | 1,046                                   |  | $                                  | 46.50 |                                                                                                      | 2,446 |                                                                                                        | 747,554
|February 1 to February 28 | 1,680                                   |  |                                    | 47.10 |                                                                                                      | 4,126 |                                                                                                        | 745,874
|March 1 to March 31       |                                        |  |                                    | NA    |                                                                                                      | 4,126 |                                                                                                        | 745,874
|Total                     | 2,726                                   |  | $                                  | 46.87 |                                                                                                      | 4,126 |                                                                                                        | 745,874

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(1)  On July 26, 2005, the Companys Board of Directors authorized a program to repurchase
up to 750,000 shares of the Companys common stock (the 2005 Stock Repurchase Program).
This authorization will expire on December 31, 2009. The Company expects the purchases pursuant to
the 2005 Stock Repurchase Program to be made from time to time in private transactions at a price
equal to the most recent quarterly independent appraisal of the shares of the Companys common
stock and with the Board reviewing the overall results of the 2005 Stock Repurchase Program on a
quarterly basis. All purchases made pursuant to the 2005 Stock Repurchase Program since its inception
have been made on that basis. The amount and timing of stock repurchases will be based on various
factors, such as the Boards assessment of the Companys capital structure and liquidity,
the amount of interest shown by shareholders in selling shares of stock to the Company at their appraised
value, and applicable regulatory, legal and accounting factors.
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

|Item 3. | Defaults upon Senior Securities                                                                 
|------- | ------------------------------------------------------------------------------------------------
|        |                                                                                                 
|        | Hills Bancorporation has no senior securities.                                                  
|        |                                                                                                 
|Item 4. | Submission of Matters to a Vote of Security Holders                                             
|        |                                                                                                 
|        | No
matters were submitted to a vote of security holders during the quarter ended March 31, 2006.
|        |                                                                                                 
|Item 5. | Other Information                                                                               
|        |                                                                                                 
|        | None                                                                                            
|        |                                                                                                 
|Item 6. | Exhibits                                                                                        
|        |                                                                                                 
|31      | Certifications
under Section 302 of the Sarbanes-Oxley Act of 2002                              
|        |                                                                                                 
|32      | Certifications
under Section 906 of the Sarbanes-Oxley Act of 2002                              

|Page 25 of 30
|-------------



|SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused
this report to be signed on its behalf by the undersigned thereunto duly authorized.
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                   
|                                                                                                                                                                                                   
|                                                                                                                                                                                                   

|Date: May 9, 2006 |  | By: /s/ Dwight O. Seegmiller                                         
|----------------- |  | ---------------------------------------------------------------------
|                  |  | Dwight O. Seegmiller, Director, President and Chief Executive Officer
|                  |  |                                                                      
|Date: May 9, 2006 |  | By: /s/ James G. Pratt                                               
|                  |  | James G. Pratt, Secretary, Treasurer and Chief Accounting Officer    

|Page 26 of 30
|-------------



|HILLS BANCORPORATIONQUARTERLY REPORT OF FORM 10-Q FOR THEQUARTER ENDED MARCH 31, 2006
|-------------------------------------------------------------------------------------
|                                                                                     

|Exhibit
      Number |  | Description                                                           |  | Page Number
      In The Sequential
      Numbering System
      March 31, 2006 Form 10-Q
|-------------------- |  | --------------------------------------------------------------------- |  | -----------------------------------------------------------------------------------------
|                    
|                     |  |                                                                       |  |                                                                                          
|31                   |  | Certifications under Section 302 of the Sarbanes-Oxley Act of    2002 |  | 28 - 29 of 30                                                                            
|                    
|32                   |  | Certifications under Section 906 of the Sarbanes-Oxley Act of    2002 |  | 30 of 30                                                                                 
|                     |  |                                                                       |  |                                                                                          
|                    
|                    

|Page 27 of 30
|-------------