<?xml version="1.0"?>
<!-- - EDGAR Ease Plus 1.0                                   07/25/03  TT    -->
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
   <periodOfReport>2003-12-22</periodOfReport>
   <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000203248</issuerCik>
        <issuerName>SOUTHERN UNION CO</issuerName>
        <issuerTradingSymbol>SUG</issuerTradingSymbol>
   </issuer>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001184006</rptOwnerCik>
            <rptOwnerName>SIMMS RONALD W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FLEISCHMAN &amp; WALSH LLP</rptOwnerStreet1>
            <rptOwnerStreet2>1919 PENNSYLVANIA AVE. NW #600</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20006</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>1</isDirector>
         <isOfficer>0</isOfficer>
         <isTenPercentOwner>0</isTenPercentOwner>
         <isOther>0</isOther>
      </reportingOwnerRelationship>
   </reportingOwner>
 <nonDerivativeTable>
   <nonDerivativeTransaction>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
         <value>2003-09-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>4</transactionFormType>
         <transactionCode>A</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>0</value>
         </transactionShares>
         <transactionPricePerShare>
            <footnoteId id="F1"/>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>A</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>6738.505</value>
            <footnoteId id="F2"/>
            <footnoteId id="F3"/>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
            <value>Directors Plan</value>
            <footnoteId id="F1"/>
         </natureOfOwnership>
      </ownershipNature>
   </nonDerivativeTransaction>
 </nonDerivativeTable>
   <footnotes>
      <footnote id="F1"> This information concerns shares held under the Issuer's Director's Deferred Compensation Plan.  This report reflects shares purchased for the plan by the plan trustee, at such prices as were available in the open market at the time of such purchases for the period ended September 30, 2003.  Information reported herein is based on a Plan Statement for the period ended September 30, 2003.</footnote>

      <footnote id="F2"> ) All shares reported hereon, have been adjusted to reflect the 5% stock dividend distributed on July 31, 2003.</footnote>

      <footnote id="F3"> The Reporting Person may also be deemed to own directly 297,472 shares of common stock and indirectly 178,695 shares owned by his wife and 206,977 shares held by persons with respect to which the Reporting Person may have or share voting and/or investment power.  The Reporting Person disclaims beneficial ownership in any such shares to the extent that he has no pecuniary interest therein.</footnote>
   </footnotes>
   <ownerSignature>
      <signatureName>Stephen A. Bouchard for Ronald W. Simms</signatureName>
      <signatureDate>2003-12-22</signatureDate>
   </ownerSignature>
</ownershipDocument>

