UNITED STATES SECURITIES AND EXCHANGE COMMISSION

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Form S-3

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Mercantile Bank Corporation

Michigan		38-3360865
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification Number)

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5650 Byron Center Avenue SW

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Gerald R. Johnson, Jr.

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Copies of Communications to:

Jerome M. Schwartz		Jennifer R. Evans
Dickinson Wright PLLC		Vedder, Price, Kaufman & Kammholz, P.C.
500 Woodward Avenue		222 North LaSalle Street
Suite 4000		Suite 2600
Detroit, Michigan 48226		Chicago, Illinois 60601
(313) 223-3628		(312) 609-7500

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     Approximate date of commencement of proposed sale to the public: As soon as practicable after this Registration Statement becomes effective.

     If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box:     o

     If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box:     o

     If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.     x     Registration No. 333-107814.

     If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.     o

     If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box.     o

CALCULATION OF REGISTRATION FEE

				Proposed Maximum		Proposed Maximum
Title of Each Class of		Amount to be		Offering Price		Aggregate Offering		Amount of
Securities to be Registered		Registered		Per Share		Price		Registration Fee
Common Stock		224,606 shares		$33.26		$7,470,396		$605

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      In accordance with the provisions of General Instruction IV of Form S-3, Mercantile Bank Corporation is registering the additional securities for an offering pursuant to Rule 462(b) under the Securities Act of 1933, and incorporates by reference the contents of its Registration Statement on Form S-3, Registration No. 333-107814 (the “Incorporated Registration Statement”). The Incorporated Registration Statement was declared effective by the Securities and Exchange Commission on Wednesday, September 17, 2003.

Item 16.     Exhibits

      All Exhibits filed with the Incorporated Registration Statement are incorporated by reference into this Registration Statement, except the following, which are filed with this Registration Statement.

Exhibit No.				Description
	5.1			Opinion of Dickinson Wright PLLC
	23.1			Consent of Crowe Chizek and Company LLC
	23.2			Consent of Dickinson Wright PLLC (included in opinion filed as Exhibit 5.1 above)

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      Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Wyoming, State of Michigan, on September 18, 2003.

	MERCANTILE BANK CORPORATION

	By	/s/ GERALD R. JOHNSON, JR.

	Gerald R. Johnson, Jr.
	Chairman of the Board and
	Chief Executive Officer

	Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

Signature				Title		Date
/s/ BETTY S. BURTON* Betty S. Burton				Director		September 18, 2003
/s/ DAVID M. CASSARD* David M. Cassard				Director		September 18, 2003
/s/ CHARLES E. CHRISTMAS Charles E. Christmas				Senior Vice President, Chief Financial Officer and Treasurer (principal accounting and financial officer)		September 18, 2003
Edward J. Clark				Director		September 18, 2003
/s/ PETER A. CORDES* Peter A. Cordes				Director		September 18, 2003
/s/ C. JOHN GILL* C. John Gill				Director		September 18, 2003
/s/ DOYLE A. HAYES* Doyle A. Hayes				Director		September 18, 2003
/s/ DAVID M. HECHT* David M. Hecht				Director		September 18, 2003
/s/ GERALD R. JOHNSON, JR. Gerald R. Johnson, Jr.				Chairman of the Board, Chief Executive Officer and Director (principal executive officer)		September 18, 2003

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Signature				Title		Date
/s/ SUSAN K. JONES* Susan K. Jones				Director		September 18, 2003
/s/ LAWRENCE W. LARSEN* Lawrence W. Larsen				Director		September 18, 2003
/s/ CALVIN D. MURDOCK* Calvin D. Murdock				Director		September 18, 2003
/s/ MICHAEL H. PRICE Michael H. Price				Director		September 18, 2003
/s/ DALE J. VISSER* Dale J. Visser				Director		September 18, 2003
Donald Williams, Sr.				Director		September 18, 2003
/s/ ROBERT M. WYNALDA* Robert M. Wynalda				Director		September 18, 2003
* Signed pursuant to power of attorney
By:		/s/ GERALD R. JOHNSON, JR. Gerald R. Johnson, Jr.

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Exhibit No.				Description
	5	.1		Opinion of Dickinson Wright PLLC
	23	.1		Consent of Crowe Chizek and Company LLC
	23	.2		Consent of Dickinson Wright PLLC (included in opinion filed as Exhibit 5.1 above)