<?xml version="1.0" encoding="utf-8"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
  <periodOfReport>2003-07-28</periodOfReport>
  <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000787648</issuerCik>
        <issuerName>TEXAS REGIONAL BANCSHARES INC</issuerName>
        <issuerTradingSymbol>TRBS</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001198653</rptOwnerCik>
            <rptOwnerName>PIGOTT R T JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>320 WEST CONDOR AVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MCALLEN</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78504</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>0</isDirector>
      <isOfficer>1</isOfficer>
      <isTenPercentOwner>0</isTenPercentOwner>
      <isOther>0</isOther>
      <officerTitle>Executive VP &amp; CFO</officerTitle>
    </reportingOwnerRelationship>
  </reportingOwner>
  <nonDerivativeTable>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <transactionDate>
        <value>2003-07-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>5</transactionFormType>
        <transactionCode>A</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value>E</value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>16.5577</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>34.07</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
          <footnoteId id="F1"/>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>1828.2886</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>By Trustee of ESOP</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
  </nonDerivativeTable>
  <footnotes>
    <footnote id="F1">The amount represents shares allocated to my account as a participant in the Texas Regional Bancshares, Inc. Amended and Restated Employee Stock Ownership Plan, (the "ESOP").</footnote>
  </footnotes>
  <ownerSignature>
    <signatureName>/s/ R. T. Pigott, Jr.</signatureName>
    <signatureDate>2003-08-06</signatureDate>
  </ownerSignature>
</ownershipDocument>

