Exhibit 31.2

I,
Todd D. Fanning, certify that:

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| | 1. | I have reviewed this annual
 report on Form 10-K of Princeton National Bancorp, Inc.;                                                                                                                                                                                                                                                     
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| | 2. | Based
 on my knowledge, this report does not contain any untrue statement of a
 material fact or omit to state a material fact necessary to make the
 statements made, in light of the circumstances under which such statements
 were made, not misleading with respect to the period covered by this report;                            
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| | 3. | Based
 on my knowledge, the financial statements, and other financial information
 included in this report, fairly present in all material respects the
 financial condition, results of operations and cash flows of the registrant
 as of, and for, the periods presented in this report;                                               
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| | 4. | The
 registrants other
 certifying officer and I are responsible for establishing and maintaining
 disclosure controls and procedures (as defined in Exchange Act Rules
 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
 defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and
 have:
| |    |                                                                                                                                                                                                                                                                                                                                           
| |    | a)                                                                                                                                                                                                                                                                                                                                         | Designed
 such disclosure controls and procedures, or caused such disclosure controls
 and procedures to be designed under our supervision, to ensure that material
 information relating to the registrant, including its consolidated
 subsidiaries, is made known to us by others within those entities,
 particularly during the period in which this report is being prepared;        
| |    |                                                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                            
| |    | b)                                                                                                                                                                                                                                                                                                                                         | Designed
 such internal control over financial reporting, or caused such internal
 control over financial reporting to be designed under our supervision, to
 provide reasonable assurance regarding the reliability of financial reporting
 and the preparation of financial statements for external purposes in
 accordance with generally accepted accounting principles;               
| |    |                                                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                            
| |    | c)                                                                                                                                                                                                                                                                                                                                         | Evaluated
 the effectiveness of the registrants disclosure controls and procedures and presented in
 this report our conclusions about the effectiveness of the disclosure
 controls and procedures, as of the end of the period covered by this report
 based on such evaluation; and                                                                                                    
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| |    | d)                                                                                                                                                                                                                                                                                                                                         | Disclosed
 in this report any change in the registrants internal control over financial reporting that
 occurred during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the
 case of an annual report) that has materially affected, or is reasonably
 likely to materially affect, the registrants internal control over financial reporting; and
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| | 5. | The
 registrants other
 certifying officer and I have disclosed, based on our most recent evaluation
 of internal control over financial reporting, to the registrants auditors and the audit
 committee of the registrants board of directors:                                                                                        
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| |    | a)                                                                                                                                                                                                                                                                                                                                         | all
 significant deficiencies and material weaknesses in the design or operation
 of internal control over financial reporting which are reasonably likely to
 adversely affect the registrants ability to record, process, summarize and report financial
 information; and                                                                                                              
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| |    | b)                                                                                                                                                                                                                                                                                                                                         | any
 fraud, whether or not material, that involves management or other employees
 who have a significant role in the registrants internal control over financial reporting.                                                                                                                                                                                                               

|/s/ Todd D. Fanning                             
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|                                                
|Todd D. Fanning                                 
|Senior
 Vice-President & Chief Financial Officer
|                                                
|March 17, 2008                                  

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