<DOCUMENT>
<TYPE>EX-21
<SEQUENCE>3
<FILENAME>k92009exv21.txt
<DESCRIPTION>SUBSIDIARIES OF THE COMPANY
<TEXT>
<PAGE>
                                   EXHIBIT 21

                   SUBSIDIARIES OF MERCANTILE BANK CORPORATION

Mercantile Bank of West Michigan, a Michigan banking corporation
     Wholly-owned bank subsidiary of Mercantile Bank Corporation

Mercantile Bank Capital Trust I
     A Delaware business trust subsidiary of Mercantile Bank Corporation

Mercantile Bank Mortgage Company, LLC, a Michigan limited liability company
     99% owned by Mercantile Bank of West Michigan and 1% owned by Mercantile
     Insurance Center, Inc.

Mercantile BIDCO, Inc, a Michigan Business and Industrial Development Company
     Wholly-owned subsidiary of Mercantile Bank of West Michigan

Mercantile Insurance Center, Inc, a Michigan business corporation
     Wholly-owned subsidiary of Mercantile Bank of West Michigan

Mercantile Bank Real Estate Co., LLC, a Michigan limited liability company
     99% owned by Mercantile Bank of West Michigan and 1% owned by Mercantile
     Insurance Center, Inc.

All of the subsidiaries named above with the exception of Mercantile Bank
Capital Trust I were organized under the laws of the State of Michigan.
Mercantile Bank Capital Trust I was organized under the laws of the State of
Delaware.
</TEXT>
</DOCUMENT>
