-----BEGIN PRIVACY-ENHANCED MESSAGE-----
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,
 GxqVGDkWE8RR8xMQePzSSiIa0IfNDUOCYMsSypC5IITH++tlK7Ne8Ad1D0mE1mez
 4mFNbXYyslI/SkuItyGGgw==

<SEC-DOCUMENT>0001181431-05-057410.txt : 20051024
<SEC-HEADER>0001181431-05-057410.hdr.sgml : 20051024
<ACCEPTANCE-DATETIME>20051024105948
ACCESSION NUMBER:		0001181431-05-057410
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20051021
FILED AS OF DATE:		20051024
DATE AS OF CHANGE:		20051024

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ZELENIK WILLIAM L
		CENTRAL INDEX KEY:			0001342093

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15373
		FILM NUMBER:		051151130

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		314-810-3656

	MAIL ADDRESS:	
		STREET 1:		150 N. MERAMEC
		CITY:			CLAYTON
		STATE:			MO
		ZIP:			63105

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENTERPRISE FINANCIAL SERVICES CORP
		CENTRAL INDEX KEY:			0001025835
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				431706259
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		150 NORTH MERAMEC
		STREET 2:		150 NORTH MERAMEC
		CITY:			CLAYTON
		STATE:			MO
		ZIP:			63105
		BUSINESS PHONE:		3147255500

	MAIL ADDRESS:	
		STREET 1:		150 NORTH MERAMEC
		STREET 2:		150 NORTH MERAMEC
		CITY:			CLAYTON
		STATE:			MO
		ZIP:			63105

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENTERBANK HOLDINGS INC
		DATE OF NAME CHANGE:	19961024
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd95136.xml
<DESCRIPTION>ZELENIK - FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-10-21</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001025835</issuerCik>
        <issuerName>ENTERPRISE FINANCIAL SERVICES CORP</issuerName>
        <issuerTradingSymbol>EFSC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001342093</rptOwnerCik>
            <rptOwnerName>ZELENIK WILLIAM L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>150 N. MERAMEC</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CLAYTON</rptOwnerCity>
            <rptOwnerState>MO</rptOwnerState>
            <rptOwnerZipCode>63105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>William L. Zelenik by Power of Attorney</signatureName>
        <signatureDate>2005-10-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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