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<PAGE> 1 EXHIBIT 23(a) CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our Report of Independent Auditors dated January 20, 2000 which appears in Mercantile Bank Corporation's Annual Report on Form 10-KSB for the year ended December 31, 1999. /s/ Crowe, Chizek and Company LLP Grand Rapids, Michigan December 21, 2000
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