-----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,
 MWdAIrBR6eqvObrRseCdNNzhJ5KKB4R7vLyVwxzmHn/xUoaJBnoC2UgBfGUqSp/W
 b3EzS/H7SBpEsx/sUjH1KQ==

<SEC-DOCUMENT>0000078460-03-000007.txt : 20030620
<SEC-HEADER>0000078460-03-000007.hdr.sgml : 20030620
<ACCEPTANCE-DATETIME>20030620151218
ACCESSION NUMBER:		0000078460-03-000007
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030409
FILED AS OF DATE:		20030620

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PIEDMONT NATURAL GAS CO INC
		CENTRAL INDEX KEY:			0000078460
		STANDARD INDUSTRIAL CLASSIFICATION:	NATURAL GAS DISTRIBUTION [4924]
		IRS NUMBER:				560556998
		STATE OF INCORPORATION:			NC
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		1915 REXFORD RD
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28211
		BUSINESS PHONE:		7043643120

	MAIL ADDRESS:	
		STREET 1:		P.O. BOX 33068
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28233

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HELMS MURIEL W
		CENTRAL INDEX KEY:			0001238147

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06196
		FILM NUMBER:		03751773

	BUSINESS ADDRESS:	
		STREET 1:		C/O PIEDMONT NATURAL GAS CO
		STREET 2:		PO BOX 33068
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28233
		BUSINESS PHONE:		7047314202

	MAIL ADDRESS:	
		STREET 1:		C/O PIEDMONT NATURAL GAS CO
		STREET 2:		PO BOX 33068
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28233
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <documentType>4</documentType>

    <periodOfReport>2003-04-09</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000078460</issuerCik>
        <issuerName>PIEDMONT NATURAL GAS CO INC</issuerName>
        <issuerTradingSymbol>PNY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001238147</rptOwnerCik>
            <rptOwnerName>HELMS MURIEL W</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>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-04-09</value>
        </transactionDate>
        <deemedExecutionDate>
            <value>2003-04-09</value>
        </deemedExecutionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
            <footnoteId id="F1"/>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>69.329</value>
            </transactionShares>
            <transactionValue>
                <value>36.06</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>11451.622</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-05-14</value>
        </transactionDate>
        <deemedExecutionDate>
            <value>2003-05-14</value>
        </deemedExecutionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
            <footnoteId id="F1"/>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>67.87</value>
            </transactionShares>
            <transactionValue>
                <value>36.835</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>11488.457</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-06-11</value>
        </transactionDate>
        <deemedExecutionDate>
            <value>2003-06-11</value>
        </deemedExecutionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
            <footnoteId id="F1"/>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>132.349</value>
            </transactionShares>
            <transactionValue>
                <value>40.14</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>11528.597</value>
                <footnoteId id="F2"/>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <footnotes>
        <footnote id="F1">All shares purchased in connection with Board of Directors adopted plan to invest earned Director fees in Company Common Stock.</footnote>
        <footnote id="F2">693 shares held indirectly by IRA.
423 shares held indirectly by Spouse.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Muriel W. Helms by Martin C. Ruegsegger, Limited Power of Attorney</signatureName>
        <signatureDate>2003-06-20</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----