S-8

As filed with the Securities and Exchange Commission on March 30, 2009

Registration No. 333-                    

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

Mercantile Bank Corporation

(Exact name of registrant as specified in its charter)

Michigan	38-3360865
(State or other jurisdiction of	(I.R.S. Employer Identification No.)
of incorporation or organization)

310 Leonard Street NW, Grand Rapids, Michigan, 49504
(Address of Principal Executive Offices) (Zip Code)

Mercantile Bank Corporation Employee Stock Purchase Plan of 2002
(Full title of the plan)

Charles E. Christmas
Mercantile Bank Corporation
310 Leonard Street NW,
Grand Rapids, Michigan 49504
(Name and address of agent for service)

(616) 406-3000
(Telephone number, including area code, of agent for service)

Copies of Communications to:
Jerome M. Schwartz
Dickinson Wright PLLC
500 Woodward Avenue, Suite 4000
Detroit, Michigan 48226

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer o	Accelerated filer þ	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

CALCULATION OF REGISTRATION FEE

Title of securities	Amount to be	Proposed maximum	Proposed maximum aggregate	Amount of
to be registered	registered (1)	offering price per share(2)	offering price (2)	registration fee
Common Stock	30,000 Shares	$5.55	$166,500	$10

(1) Plus an indeterminate number of additional shares which may be required to be issued to prevent dilution resulting from stock splits, stock dividends or similar transactions.

(2) Estimated pursuant to rule 457(h) and (c) solely for purposes of calculating the registration fee, based upon the average of the high and low prices of the common stock on March 25, 2009, as reported on The Nasdaq Stock Market LLC.

TABLE OF CONTENTS

PART I
	Item 1. Plan Information
	Item 2. Registrant Information and Employee Plan Annual Information
Part II
	Item 3. Incorporation of Documents by Reference
	Item 4. Description of Securities
	Item 5. Interests of Named Experts and Counsel
	Item 6. Indemnification of Directors and Officers
	Item 7. Exemption from Registration Claimed
	Item 8. Exhibits
	Item 9. Undertakings
SIGNATURES
EXHIBIT INDEX
EX-4.C
EX-4.D
EX-5
EX-23.A
EX-23.B

Explanatory Note

          This registration statement on Form S-8 is filed by Mercantile Bank Corporation (“Mercantile”). It relates to 30,000 shares of Mercantile common stock that may be purchased by participants pursuant to the Mercantile Bank Corporation Employee Stock Purchase Plan of 2002, as amended (the “Plan”), plus an indeterminate number of additional shares of Mercantile common stock that may be issued to prevent dilution resulting from stock splits, stock dividends or similar transactions (“Adjustment Shares”). The 30,000 shares and the Adjustment Shares are in addition to shares of common stock previously registered for purchase pursuant to the Plan, including those shares previously registered pursuant to Mercantile’s registration statement on a Form S-8 that was filed with the SEC (Commission file number 333-99853) on September 19, 2002.

PART I

INFORMATION REQUIRED IN SECTION 10(A) PROSPECTUS

Item 1. Plan Information.

          Not filed as part of this registration statement pursuant to Note to Part I of Form S-8.

Item 2. Registrant Information and Employee Plan Annual Information.

          Not filed as part of this registration statement pursuant to Note to Part I of Form S-8.

Part II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference.

          Mercantile incorporates by reference in this registration statement the following documents previously filed with the Securities and Exchange Commission (the “Commission”) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”):

          1. Mercantile’s annual report on Form 10-K for the year ended December 31, 2008.

          2. All other reports filed by Mercantile pursuant to Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the annual report referred to in paragraphs 1 above.

          3. The description of Mercantile’s common stock in Item 1 of Mercantile’s amended Form 8-A registration statement dated November 23, 2005, filed with the Commission under the

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Exchange Act on November 23, 2005, including any amendments or reports filed for the purpose of updating the description.

          All documents subsequently filed with the Commission by Mercantile pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold shall be deemed to be incorporated in this registration statement by reference and to be a part of this registration statement from the date of filing of such documents.

          Any statements contained in this registration statement or in a document incorporated or deemed to be incorporated by reference in this registration statement shall be deemed to be modified or superseded for purposes of this registration statement to the extent that a statement contained in this registration statement or in any other subsequently filed document which also is or is deemed to be incorporated by reference in this registration statement modifies or supersedes such earlier statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this registration statement.

Item 4. Description of Securities.

          Not Applicable.

Item 5. Interests of Named Experts and Counsel.

          As of March 26, 2009, members of Dickinson Wright PLLC who perform services for Mercantile owned approximately 14,000 shares of common stock of Mercantile.

Item 6. Indemnification of Directors and Officers.

          Indemnification

          Sections 561-571 of the Michigan Business Corporation Act, as amended, grant Mercantile broad powers to indemnify any person in connection with legal proceedings brought against that person by reason of their present or past status as an officer or director of Mercantile, provided that the person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to Mercantile’s best interests, and with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful. The Michigan Business Corporation Act also gives Mercantile broad powers to indemnify defined persons against expenses and reasonable settlement payments in connection with any action by or in the right of Mercantile, provided the person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to Mercantile’s best interests, except that no indemnification may be made if that person is adjudged to be liable to Mercantile unless and only to the extent the court in which that action was brought determines upon application that, despite the adjudication, but in view of all the circumstances of the case, the person is fairly and reasonably entitled to indemnity for reasonable expenses as the court deems proper. In addition, to the

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extent that any specified person is successful in the defense of any defined legal proceeding, Mercantile is required by the Michigan Business Corporation Act to indemnify him or her against expenses, including attorneys’ fees, that are actually and reasonably incurred in connection with the proceeding.

          Mercantile’s Articles of Incorporation provide that it shall indemnify its present and past directors, officers, and such other persons as the Board of Directors may authorize to the full extent permitted by law.

          Mercantile’s Bylaws contain indemnification provisions concerning third party actions as well as actions in the right of Mercantile. The Bylaws provide that Mercantile shall indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of Mercantile) by reason of the fact that he or she is or was a director or officer of Mercantile or while serving as such a director or officer, is or was serving at the request of Mercantile as a director, officer, partner, trustee, employee or agent of another foreign or domestic corporation, partnership, joint venture, trust or other enterprise, whether for profit or not, against expenses (including attorney’s fees), judgments, penalties, fees and amounts paid in settlement actually and reasonably incurred by him or her in connection with such action, suit or proceeding if he or she acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of Mercantile or its shareholders and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful.

          Federal Deposit Insurance Corporation regulations impose limitations on indemnification payments which could restrict, in certain circumstances, payments by Mercantile or its subsidiary, Mercantile Bank of Michigan, to their respective directors or officers otherwise permitted under the Michigan Business Corporation Act or the Michigan Banking Code.

          With respect to derivative actions, the Bylaws provide that Mercantile shall indemnify any person who was or is a party to or is threatened to be made a party to any threatened, pending or completed action or suit by or in the right of Mercantile to procure a judgment in its favor by reason of the fact that he or she is or was a director or officer of Mercantile, or while serving as such a director or officer, is or was serving at the request of Mercantile as a director, officer, partner, trustee, employee or agent of another foreign or domestic corporation, partnership, joint venture, trust or other enterprise, whether for profit or not, against expenses (including attorney’s fees) and amounts paid in settlement actually and reasonably incurred by him or her in connection with the action or suit if he or she acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of Mercantile or its shareholders. No indemnification is provided in the Bylaws in respect of any claim, issue or matter in which such person has been found liable to Mercantile except to the extent that a court of competent jurisdiction determines upon application that, despite the adjudication of liability but in view of all circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which such court shall deem proper.

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          Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of Mercantile pursuant to the provisions discussed above or otherwise, Mercantile has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable.

          The Michigan Business Corporation Act permits Mercantile to purchase insurance on behalf of its directors and officers against liability arising out of their positions with Mercantile (or positions held with another entity at the request of Mercantile), whether or not the liabilities would be within the indemnification provisions described above. Under an insurance policy maintained by Mercantile, its directors and officers are insured within the limits and subject to the limitations of the policy, against specified expenses in connection with the defense of specified claims, actions, suits or proceedings, and specified liabilities which might be imposed as a result of claims, actions, suits or proceedings, which may be brought against them by reason of being or having been directors and officers of Mercantile.

Limitation of Director Liability

          Section 209(1)(c) of the Michigan Business Corporation Act permits corporations to limit the personal liability of their directors in certain circumstances. However, under the Michigan Business Corporation Act, a corporation may not eliminate or limit a director’s liability to the corporation or its shareholders for money damages for any action taken or any failure to take any action as a director for any of the following: (1) the amount of a financial benefit received by a director to which he or she is not entitled; (2) intentional infliction of harm on the corporation or its shareholders; (3) a violation of Section 551 of the Michigan Business Corporation Act; and (4) an intentional criminal act.

          Mercantile’s Articles of Incorporation provide that its directors shall not be personally liable to it or its shareholders for monetary damages for breach of fiduciary duty, except for liability (1) for any breach of the director’s duty of loyalty to Mercantile or its shareholders; (2) for acts or omissions not in good faith or that involve intentional misconduct or a knowing violation of law; (3) for a violation of Section 551(1) of the Michigan Business Corporation Act; or (4) for any transaction from which the director derived any improper personal benefit. Under the Michigan Business Corporation Act, if prior to October 24, 1997 the articles of incorporation of a corporation contained a provision which, subject to exceptions, eliminated liability of a director as Mercantile’s does, that provision is considered to eliminate liability of a director to the extent permitted in Section 209(1)(c) of the Michigan Business Corporation Act.

          Pursuant to Mercantile’s Articles of Incorporation, if the Michigan Business Corporation Act is amended after the date of the Articles of Incorporation to authorize corporate action eliminating or limiting the personal liability of directors, then the liability of a director of Mercantile shall be eliminated or limited to the fullest extent permitted by the Michigan Business Corporation Act, as so amended.

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Item 7. Exemption from Registration Claimed.

          Not Applicable

Item 8. Exhibits.

          The following exhibits are filed with this registration statement:

Exhibit
Number	Exhibit
4(a)	Article III of the Articles of Incorporation of Mercantile, is incorporated by reference to Article III, as amended, of exhibit 3.1 of Mercantile’s Form 10-Q for the quarter ended June 30, 2008
4(b)	Mercantile Bank Corporation Employee Stock Purchase Plan of 2002 is incorporated by reference to exhibit 10.47 of Mercantile’s Form 10-K for the year ended December 31, 2008
4(c)	First Amendment to Mercantile Bank Corporation Employee Stock Purchase Plan of 2002
4(d)	Second Amendment to Mercantile Bank Corporation Employee Stock Purchase Plan of 2002
5	Opinion of Counsel, Dickinson Wright PLLC
23(a)	Consent of BDO Seidman, LLP
23(b)	Consent of Crowe Horwath LLP
23(c)	Consent of Dickinson Wright PLLC is included in exhibit 5
24	Power of Attorney is included on the signature pages of the registration statement

Item 9. Undertakings.

     (a) The undersigned registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

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               (i) to include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;

               (ii) to reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement, provided that any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b), if in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement;

               (iii) to include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement.

          (2) That, for purposes of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

     (b) The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant, in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question of whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

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SIGNATURES

          The Registrant. 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-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Grand Rapids, State of Michigan on March 26, 2009.

Mercantile Bank Corporation
By	/s/ Charles E. Christmas
	Charles E. Christmas, Senior Vice President,
	Chief Financial Officer and Treasurer

          Each person whose signature appears below constitutes and appoints Michael H. Price, Robert B. Kaminski, Jr. and Charles E. Christmas, and each of them, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, severally, for him or her, and in his or her name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this registration statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

          Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities indicated on March 26, 2009.

/s/ Betty S. Burton	/s/ Calvin D. Murdock
Betty S. Burton, Director	Calvin D. Murdock, Director
/s/ David M. Cassard	/s/ Michael H. Price
David M. Cassard, Director	Michael H. Price, Chairman of the Board, President and Chief Executive Officer (principal executive officer)
/s/ Edward J. Clark	/s/ Merle J. Prins
Edward J. Clark, Director	Merle J. Prins, Director
/s/ Peter A. Cordes	/s/ Timothy O. Schad
Peter A. Cordes, Director	Timothy O. Schad, Director
/s/ Doyle A. Hayes	/s/ Dale J. Visser
Doyle A. Hayes, Director	Dale J. Visser, Director
/s/ Susan K. Jones	/s/ Donald Williams, Sr.
Susan K. Jones, Director	Donald Williams, Sr., Director
/s/ Lawrence W. Larsen	/s/ Charles E. Christmas
Lawrence W. Larsen, Director	Charles E. Christmas, Senior Vice President, Chief Financial Officer and Treasurer (principal financial and accounting officer)

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EXHIBIT INDEX

Number	Exhibit
4(a)	Article III of the Articles of Incorporation of Mercantile, is incorporated by reference to Article III, as amended, of exhibit 3.1 of Mercantile’s Form 10-Q for the quarter ended June 30, 2008
4(b)	Mercantile Bank Corporation Employee Stock Purchase Plan of 2002 is incorporated by reference to exhibit 10.47 of Mercantile’s Form 10-K for the year ended December 31, 2008
4(c)	First Amendment to Mercantile Bank Corporation Employee Stock Purchase Plan of 2002
4(d)	Second Amendment to Mercantile Bank Corporation Employee Stock Purchase Plan of 2002
5	Opinion of Counsel, Dickinson Wright PLLC
23(a)	Consent of BDO Seidman, LLP
23(b)	Consent of Crowe Horwath LLP
23(c)	Consent of Dickinson Wright PLLC is included in exhibit 5
24	Power of Attorney is included on the signature pages of the registration statement

EX-4.C

Exhibit 4(c)

FIRST AMENDMENT TO

MERCANTILE BANK CORPORATION

EMPLOYEE STOCK PURCHASE PLAN OF 2002

     THIS AMENDMENT to the Mercantile Bank Corporation Employee Stock Purchase Plan of 2002 (the “Plan”) is adopted effective as of February 28, 2009.

     WHEREAS, the Board of Directors of Mercantile Bank Corporation (the “Company”) adopted the Plan effective as of October 1, 2002;

     WHEREAS, Section 10.2 of the Plan authorizes the Committee or the Board of Directors of the Company to adopt amendments to the Plan;

     WHEREAS, the Company wishes to increase the number of shares available for purchase under the Plan from 25,000 to 55,000;

     NOW, THEREFORE, this Amendment is adopted, effective as of February 28, 2009:

     1. Section 4.1 of the Plan is amended in its entirety as follows:

     “4.1 Number of Shares of Common Stock. There shall be reserved for issuance to and purchase by Participants under the Plan an aggregate of 55,000 shares of Common Stock, subject to adjustment as provided in Section 4.2. Shares of Common Stock available under the Plan shall be authorized and unissued shares or shares purchased by the Company.”

     2. Capitalized terms used in this Amendment and not defined have the meanings given to them in the Plan. Except as hereby amended, the Plan shall remain in full force and effect.

     IN WITNESS WHEREOF, this Amendment is executed by an authorized officer of the Company.

MERCANTILE BANK CORPORATION
By:	/s/ Michael H. Price
Its:	Chairman and CEO

Approved by the Board of Directors on February 26, 2009
Effective: February 28, 2009

EX-4.D

Exhibit 4(d)

SECOND AMENDMENT TO

MERCANTILE BANK CORPORATION

EMPLOYEE STOCK PURCHASE PLAN OF 2002

     THIS AMENDMENT to the Mercantile Bank Corporation Employee Stock Purchase Plan of 2002 is adopted effective as of March 26, 2009.

     WHEREAS, the Board of Directors of Mercantile Bank Corporation (the “Company”) adopted the Employee Stock Purchase Plan of 2002 effective as of October 1, 2002, and subsequently amended the plan by a First Amendment effective as of February 28, 2009 (as so amended, the “Plan”);

     WHEREAS, Section 10.2 of the Plan authorizes the Committee or the Board of Directors of the Company to adopt amendments to the Plan;

     WHEREAS, the Company wishes to revise the method of determining the Fair Market Value of the shares of Common Stock purchased on the Stock Purchase Date;

     NOW, THEREFORE, this Amendment is adopted, effective as of March 26, 2009:

     1. Section 2.8 of the Plan is amended in its entirety to provide as follows:

     “2.8 “Fair Market Value” as of any Stock Purchase Date means the consolidated closing bid price of the Common Stock reported on The Nasdaq Stock Market (or other stock exchange or quotation system on which the Company’s Common Stock may be traded on the date in question) on such Stock Purchase Date or, if such Stock Purchase Date is not a trading day, the most recent date on which shares of Common Stock were traded on The Nasdaq Stock Market (or such other stock exchange or quotation system). If the Company’s Common Stock is not listed on The Nasdaq Stock Market, or another stock exchange or quotation system on the Stock Purchase Date in question, the Fair Market Value shall be determined by any means deemed fair and reasonable by the Committee, which determination shall be final and binding on all parties.”

     2. Capitalized terms used in this Amendment and not defined have the meanings given to them in the Plan. Except as hereby amended, the Plan shall remain in full force and effect.

     IN WITNESS WHEREOF, this Amendment is executed by an authorized officer of the Company.

MERCANTILE BANK CORPORATION
By:	/s/ Michael H. Price
Its:	Chairman and CEO

Approved by the Board of Directors on March 26, 2009
Effective: March 26, 2009

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EX-5

Exhibit 5

500 Woodward Avenue, Suite 4000
Detroit, Michigan 48226-3425
Telephone: (313) 223-3500
Facsimile: (313) 223-3598
http://www.dickinsonwright.com

Jerome M. Schwartz
JSchwartz@dickinsonwright.com
(313) 223-3628

March 26, 2009

Mercantile Bank Corporation
310 Leonard Street NW
Grand Rapids, Michigan 49504

Re:  Mercantile Bank Corporation
Employee Stock Purchase Plan of 2002, as amended
Registration Statement on Form S-8

Ladies and Gentlemen:

     We are acting as counsel for Mercantile Bank Corporation, a Michigan corporation (“Mercantile”), in connection with its registration on a Form S-8 registration statement (the “Registration Statement”) of 30,000 shares of its common stock (the “Plan Shares”) that may be issued under the Mercantile Bank Corporation Employee Stock Purchase Plan of 2002, as amended by the First Amendment to the Mercantile Bank Corporation Employee Stock Purchase Plan of 2002 and the Second Amendment to the Mercantile Bank Corporation Employee Stock Purchase Plan of 2002 (as so amended, the “Plan”). This opinion is being delivered pursuant to the requirements of Item 601(b)(5) of Regulation S-K under the Securities Act of 1933 (the “Act”).

     As counsel to Mercantile and in connection with this opinion, we have examined and relied upon copies, certified or otherwise identified to our satisfaction, of (i) the Articles of Incorporation of Mercantile, (ii) the Bylaws of Mercantile, (iii) records of actions of the shareholders and Board of Directors of Mercantile, (iv) resolutions of the Board of Directors of Mercantile relating to the adoption of the Plan, (v) the Registration Statement, and (vi) such other documents as we have deemed appropriate in connection with this opinion.

     In our examination, we have assumed the genuineness of all signatures, the legal capacity of all natural persons signing or delivering an instrument, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as certified, telecopied, facsimile, conformed or photostatic copies, and the absence of any understandings, waivers, or amendments which would vary the terms of any document which we have reviewed. As to various questions of fact material to this opinion, we have relied upon oral or written statements and representations of officers or other representatives of Mercantile and upon certificates or other documents of public officials. We have further assumed that this opinion will be used only in connection with the offer and sale of Plan Shares while the Registration Statement remains in effect under the Act.

Counselors At Law

Detroit       Nashville       Washington, D.C.       Toronto       Phoenix
Bloomfield Hills       Ann Arbor       Lansing       Grand Rapids

Mercantile Bank Corporation
March 26, 2009
Page 2

     Based upon the foregoing, and subject to the qualifications and limitations stated herein, it is our opinion that the Plan Shares have been duly authorized and, once the Registration Statement has become effective under the Act, when and to the extent Plan Shares are duly issued, sold, and paid for in accordance with the terms of the Plan, such Plan Shares will be validly issued, fully paid and non-assessable.

     Our opinions expressed herein are subject to bankruptcy, insolvency and other similar laws affecting the rights and remedies of creditors generally and general principles of equity.

     We have not reviewed for purposes of this opinion, and this opinion does not address: any ERISA laws, rules or regulations; any Federal or state securities or “blue sky” laws, rules or regulations; any Federal or state banking laws, rules or regulations, any laws relating to fiduciary duties; or any Federal, state or local taxation laws, rules, or regulations.

     This opinion is limited in all respects to matters arising under the Business Corporation Act of the State of Michigan, and, to the extent addressed herein, the Federal law of the United States of America.

     This opinion is limited to the matters set forth herein and no opinion is intended to be implied or may be inferred beyond those expressly stated herein. This opinion is predicated solely upon laws and regulations in existence as of the current date, and as they currently apply, and as to the facts as they currently exist. We assume no obligation to revise or supplement this opinion should such matters change by legislative action, judicial decision or otherwise.

     We consent to the filing of this opinion as Exhibit 5 to the Registration Statement and to the reference to our Firm’s name in Item 5, Interests of Named Experts and Counsel, of the Registration Statement. In giving such consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Securities and Exchange Commission.

Very truly yours,

/s/ Dickinson Wright PLLC

JMS:JKL/km

Counselors At Law

Detroit       Nashville       Washington, D.C.       Toronto       Phoenix
Bloomfield Hills       Ann Arbor       Lansing       Grand Rapids

EX-23.A

Exhibit 23(a)

Consent of Independent Registered Public Accounting Firm

Mercantile Bank Corporation
Grand Rapids, Michigan

          We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated March 11, 2009, relating to the consolidated financial statements and the effectiveness of Mercantile Bank Corporation’s internal control over financial reporting, appearing in Mercantile Bank Corporation’s Annual Report on Form 10-K for the year ended December 31, 2008.

/s/ BDO Seidman, LLP

BDO Seidman, LLP

Grand Rapids, Michigan
March 26, 2009

EX-23.B

Exhibit 23(b)

Consent of Independent Registered Public Accounting Firm

          We consent to the incorporation by reference in this registration statement on Form S-8 of Mercantile Bank Corporation of our report dated February 20, 2007 relating to the 2006 consolidated financial statements of Mercantile Bank Corporation, which report appears in Mercantile Bank Corporation’s annual report on Form 10-K for the year ended December 31, 2008.

/s/ Crowe Horwath LLP  

Crowe Horwath LLP 

Grand Rapids, Michigan
March 26, 2009