Mercantile Bank (MBWM) 10-K 2008 FY Annual report

EXHIBIT 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements of Mercantile Bank Corporation on Form S-8 (Registration Nos. 333-52620, 333-91434, 333-99853, 333-103242, 333-117763, 333-119767, 333-138328 and 333-152254) and Form S-3 (Registration Nos. 333-59154, 333-103376, 333-108929, and 333-107814) of our report dated February 20, 2007 relating to the consolidated financial statements of Mercantile Bank Corporation for the year ended December 31, 2006 which report is included in the 2008 Annual Report on Form 10-K of Mercantile Bank Corporation for the year ended December 31, 2008.

/s/ Crowe Horwath LLP  

Crowe Horwath LLP 

Grand Rapids, Michigan
March 11, 2009

1