Exhibit: 23.1

Consent of Independent Registered Public Accounting Firm

Mercantile Bank Corporation
Grand Rapids, Michigan

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-117763) of our report dated June 26, 2008, relating to the financial statements and supplemental schedule of Mercantile Bank of Michigan 401(k) Plan appearing in this Form 11-K for the year ended December 31, 2007.

/s/ BDO Seidman, LLP

BDO Seidman, LLP

Grand Rapids, Michigan

June 26, 2008

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