SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 10-K/A
 (Amendment No. 1)
 (Mark One)
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    Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act
of 1934
 For the fiscal year ended December 31, 2007
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    Transition report pursuant to Section 13 or 15(d) of the Securities and
Exchange Act of 1934
 Commission File No.: 001-32434
 MERCANTILE BANCORP, INC.
  Delaware
    
    37-1149138(State or Other Jurisdiction of 
Incorporation or Organization)
    
    (I.R.S. Employer
Identification Number)200 N. 33rdStreet, Quincy, Illinois
    
    62301(Address of Principal Executive Offices)
    
    (Zip Code)
 (217) 223-7300
  Title of Each Class
    
    Name of Each Exchange on Which RegisteredCommon Stock (par value $.42 per share)
    
    American Stock Exchange
  Not Applicable
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    Accelerated filer þ
    
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(Do not check if a smaller reporting company)
    
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Explanatory Note: I
 PART IV
 Item 15. Exhibits, Financial Statement Schedules




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SIGNATURES
  MERCANTILE BANCORP, INC.
(Registrant)By:
    
    /s/ Michael P. McGrathName:
    
    Michael P. McGrathTitle:
    
    Executive Vice President, Treasurer,Secretary and Chief Financial OfficerDated: January 20, 2009




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ExhibitNumber
    
    Description of Exhibit*3.1
    
    Certificate of Incorporation of Mercantile Bancorp, Inc., as amended, filed with the Registration
Statement on Form 10 dated May 12, 2004 (File No. 000-50757) (the Registration Statement), under the
same exhibit number.3.2
    
    Bylaws of Mercantile Bancorp, Inc., as amended, filed as Exhibit 99.1 to a Current Report on Form 8-K
filed November 21, 2007.4.1
    
    Shareholder Rights Agreement dated July 9, 1999 between the Company and Mercantile Trust & Savings
Bank, filed under same exhibit number with the Registration Statement.4.2
    
    Amendment to Shareholder Rights Agreement dated May 15, 2000 between the Company and
Mercantile Trust & Savings Bank, filed under same exhibit number with the
Registration Statement.10.1
    
    Amendment in its Entirety to Employment Agreement dated December 19, 2005, between
Mercantile Bancorp, Inc. and Mercantile Trust & Savings Bank and Dan S. Dugan, filed
as Exhibit 10.1 with the Annual Report on Form 10-K for the fiscal year ended
December 31, 2005.10.2
    
    Executive Employee Salary Continuation Agreement dated December 8, 1994 between
Mercantile Trust & Savings Bank and Dan S. Dugan, filed as Exhibit 10.3 with the
Registration Statement.10.3
    
    Amendment to Dugan Executive Employee Salary Continuation Agreement dated April 26,
2004, filed as Exhibit 10.4 with the Registration Statement.10.4
    
    Second Amendment to Dugan Executive Employee Salary Continuation Agreement dated
December 29, 2006, filed as Exhibit 10.1 to a Current Report on Form 8-K filed
January 5, 2007.10.5
    
    Executive Employee Salary Continuation Agreement dated December 8, 1994 between
Mercantile Trust & Savings Bank and Ted T. Awerkamp, filed as Exhibit 10.5 with the
Registration Statement.10.6
    
    Amendment to Awerkamp Executive Employee Salary Continuation Agreement dated April
26, 2004, filed as Exhibit 10.6 with the Registration Statement.10.7
    
    Second Amendment to Awerkamp Executive Employee Salary Continuation Agreement dated
December 18, 2007, filed herewith.**10.8
    
    Employment Agreement dated January 1, 2008, between the Company and Ted T. Awerkamp,
filed herewith.**10.9
    
    Employment Agreement dated January 1, 2008, between the Company and Michael P.
McGrath, filed herewith.**10.10
    
    Employment Agreement dated January 1, 2008, between the Company and Daniel J. Cook,
filed herewith.**10.11
    
    Mercantile Bancorp, Inc. Incentive Compensation Plan, filed as Exhibit 10.4 to a
Current Report on Form 8-K filed on April 18, 2007.10.12
    
    Mercantile Bancorp, Inc. Profit Sharing Plan and Trust, filed as Exhibit 10.7 with
the Registration Statement.10.13
    
    401(k) Plan Adoption Agreement, filed as Exhibit 10.8 with the Registration Statement.10.14
    
    Amendment to the Profit Sharing Plan and Trust, filed as Exhibit 10.9 with the
Registration Statement.10.15
    
    Consulting Agreement dated March 2, 2007 between Mercantile Bancorp, Inc. and Dan S.
Dugan, filed as Exhibit 10.1 to a Current Report on Form 8-K filed March 7, 2007.




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ExhibitNumber
    
    Description of Exhibit*10.16
    
    Consulting Agreement dated January 15, 2008 between Mercantile Bancorp, Inc. and Dan
S. Dugan, filed herewith.**10.17
    
    Third Amended and Restated Term Loan Agreement dated November 10, 2006 by and between
Mercantile Bancorp, Inc., Borrower, and U.S. Bank National Association, formerly
known as Firstar Bank, N.A., Lender, filed as Exhibit 10.1 with the Periodic Report
on Form 10-Q for the quarter ended September 30, 2006 (the 2006 Third Quarter Form
10-Q).10.18
    
    First Amendment to Third Amended and Restated Loan Agreement between Mercantile
Bancorp, Inc. and U.S. Bank National Association, dated March 20, 2007, filed as
Exhibit 10.1 to a Current Report on Form 8-K filed March 24, 2007.10.19
    
    Second Amendment to Third Amended and Restated Loan Agreement between Mercantile
Bancorp, Inc. and U.S. Bank National Association, dated as of June 30, 2007, filed as
Exhibit 10.1 to a Current Report on Form 8-K filed July 19, 2007.10.20
    
    Third Amendment to Third Amended and Restated Loan Agreement between Mercantile
Bancorp, Inc. and U.S. Bank National Association, dated September 7, 2007, filed as
Exhibit 10.1 to a Current Report on Form 8-K filed September 12, 2007.10.21
    
    Construction Agreement dated August 24, 2006 by and between Mercantile Trust &
Savings Bank, Owner, and Clayco, Inc., Contractor, filed as Exhibit 10.2 with the
2006 Third Quarter Form 10-Q.10.22
    
    General Conditions of the Contract for Construction by and between Mercantile Trust &
Savings Bank, Owner, and Clayco, Inc., Contractor, filed as Exhibit 10.3 with the
2006 Third Quarter Form 10-Q.14.1
    
    Code of Ethics, filed under same exhibit number with Annual Report on Form 10-K for
fiscal year ended December 31, 2004.21.1
    
    Subsidiaries of registrant, filed herewith.**31.1
    
    Certification of the Chief Executive Officer pursuant to Rule 13a-14(a) of the
Securities Exchange Act of 1934, as amended, filed herewith.31.2
    
    Certification of the Chief Financial Officer pursuant to Rule 13a-14(a) of the
Securities Exchange Act of 1934, as amended, filed herewith.32.1
    
    Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350,
adopted pursuant to 906 of the Sarbanes-Oxley Act of 2002, filed herewith.32.2
    
    Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350,
adopted pursuant to 906 of the Sarbanes-Oxley Act of 2002, filed herewith.
 
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    To the extent not filed herewith, the document is incorporated herein by reference from the
filing listed in the index.**
    
    Filed on March 17, 2008, with the Annual Report on Form 10-K.
    
    Management contract or compensatory plan or arrangement.