EXHIBIT 21

SUBSIDIARIES OF MERCANTILE BANK CORPORATION

Mercantile Bank of 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 Michigan and 1% owned by Mercantile Insurance Center, Inc.
Mercantile Insurance Center, Inc, a Michigan business corporation
	Wholly-owned subsidiary of Mercantile Bank of Michigan
Mercantile Bank Real Estate Co., LLC, a Michigan limited liability company
	99% owned by Mercantile Bank of Michigan and 1% owned by Mercantile Insurance Center, Inc.

All five 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.