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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 IYKzkEsCqKsDYNGsfVBDKXf6K/LMw2GCVS9GbGNNTExfLR1deBN+1ueTGe6z7NLH
 nM8J4b1YMp4y7wd0i4IF8g==

<SEC-DOCUMENT>0001209191-03-007328.txt : 20030611
<SEC-HEADER>0001209191-03-007328.hdr.sgml : 20030611
<ACCEPTANCE-DATETIME>20030611170627
ACCESSION NUMBER:		0001209191-03-007328
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030610
FILED AS OF DATE:		20030611

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MERCANTILE BANK CORP
		CENTRAL INDEX KEY:			0001042729
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				383360865
		STATE OF INCORPORATION:			MI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5650 BYRON CENTER AVENUE S. W.
		CITY:			WYOMING
		STATE:			MI
		ZIP:			49509
		BUSINESS PHONE:		616 406-3777

	MAIL ADDRESS:	
		STREET 1:		5650 BYRON CENTER AVENUE S. W.
		CITY:			WYOMING
		STATE:			MI
		ZIP:			49509

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CASSARD DAVID M
		CENTRAL INDEX KEY:			0001208501

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26719
		FILM NUMBER:		03741069

	BUSINESS ADDRESS:	
		STREET 1:		DICKENSON WRIGHT PLLC
		STREET 2:		500 WOODWARD, #4000
		CITY:			DETROIT
		STATE:			MI
		ZIP:			48226
		BUSINESS PHONE:		616-975-7746

	MAIL ADDRESS:	
		STREET 1:		C/O WATERS CORPORATION
		STREET 2:		WATERS BLDG., 161 OTTAWA NW, SUITE 104
		CITY:			GRAND RAPIDS
		STATE:			MI
		ZIP:			49503-2799
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-06-10</periodOfReport>
    <issuer>
        <issuerCik>0001042729</issuerCik>
        <issuerName>MERCANTILE BANK CORP</issuerName>
        <issuerTradingSymbol>MBWM</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001208501</rptOwnerCik>
            <rptOwnerName>CASSARD DAVID M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle></officerTitle><otherText></otherText></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-06-10</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>118.812</value></transactionShares><transactionValue><value>25.25</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>6263.006</value><footnoteId id="F1" /></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><val
ue>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeSecurity><footnotes><footnote id="F1">Mr. Cassard's Form 4 dated 5/13/03 was inadvertently recorded twice on the Edgar database due to what is believed to have been a filing system error.  The second filing of Mr. Cassard's 5/13/03 Form 4 should be disregarded.</footnote></footnotes><ownerSignature><signatureName>Jerome M. Schwartz
Attorney in Fact</signatureName><signatureDate>2003-06-11</signatureDate></ownerSignature></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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