-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 aIIUfOrP1pTHTd+ZIgux1Q==

<SEC-DOCUMENT>0000737468-06-000109.txt : 20060426
<SEC-HEADER>0000737468-06-000109.hdr.sgml : 20060426
<ACCEPTANCE-DATETIME>20060426104733
ACCESSION NUMBER:		0000737468-06-000109
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060425
FILED AS OF DATE:		20060426
DATE AS OF CHANGE:		20060426

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WASHINGTON TRUST BANCORP INC
		CENTRAL INDEX KEY:			0000737468
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				050404671
		STATE OF INCORPORATION:			RI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		23 BROAD ST
		CITY:			WESTERLY
		STATE:			RI
		ZIP:			02891
		BUSINESS PHONE:		4013481200

	MAIL ADDRESS:	
		STREET 1:		23 BROAD STREET
		CITY:			WESTERLY
		STATE:			RI
		ZIP:			02891

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MCKEOUGH KATHLEEN E
		CENTRAL INDEX KEY:			0001241414

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-13091
		FILM NUMBER:		06779898

	BUSINESS ADDRESS:	
		STREET 1:		C/O GTECH HOLDINGS CORPORATION
		STREET 2:		55 TECHNOLOGY WAY
		CITY:			WEST GREENWICH
		STATE:			RI
		ZIP:			02817
		BUSINESS PHONE:		401392-1000

	MAIL ADDRESS:	
		STREET 1:		20 MYRTLE AVENUE
		CITY:			RIVERSIDE
		STATE:			RI
		ZIP:			02915
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-04-25</periodOfReport>

    <issuer>
        <issuerCik>0000737468</issuerCik>
        <issuerName>WASHINGTON TRUST BANCORP INC</issuerName>
        <issuerTradingSymbol>WASH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001241414</rptOwnerCik>
            <rptOwnerName>MCKEOUGH KATHLEEN E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>20 MYRTLE AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>RIVERSIDE</rptOwnerCity>
            <rptOwnerState>RI</rptOwnerState>
            <rptOwnerZipCode>02915</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-04-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2020</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options (Right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>27.56</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2007-04-27</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-04-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Acquisition represents award of nonvested share units for no consideration.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>David V. Devault EVP, Secretary, Treasurer, CFO-POA</signatureName>
        <signatureDate>2006-04-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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