EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. § 1350, and accompanies the annual report on Form 10-K for the year ended December 31, 2011 (the “Form 10-K”) of Mercantile Bank Corporation (the “Issuer”).

I, Charles E. Christmas, Senior Vice President, Chief Financial Officer and Treasurer of the Issuer, certify that to my knowledge:

(i) the Form 10-K fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)); and

(ii) the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Issuer.

Dated: March 14, 2012

/s/ Charles E. Christmas

Charles E. Christmas

Senior Vice President, Chief Financial Officer and Treasurer