<SUBMISSION>
<ACCESSION-NUMBER>0001314626-08-000012
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20081201
<FILING-DATE>20081202
<DATE-OF-FILING-DATE-CHANGE>20081202
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>AGEE NANCY H
<CIK>0001314626
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>000-26591
<FILM-NUMBER>081225945
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>540.981-8862
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>PO BOX 13727
<CITY>ROANOKE
<STATE>VA
<ZIP>24036
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>RGC RESOURCES INC
<CIK>0001069533
<ASSIGNED-SIC>4923
<IRS-NUMBER>541909697
<STATE-OF-INCORPORATION>VA
<FISCAL-YEAR-END>0930
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>519 KIMBALLAVENUE N.E.
<CITY>ROANOKE
<STATE>VA
<ZIP>24016
<PHONE>5407774427
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>519 KIMBALL AVENUE N.E.
<CITY>ROANOKE
<STATE>VA
<ZIP>24016
</MAIL-ADDRESS>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-12-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001069533</issuerCik>
        <issuerName>RGC RESOURCES INC</issuerName>
        <issuerTradingSymbol>RGCO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001314626</rptOwnerCik>
            <rptOwnerName>AGEE NANCY H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>PO BOX 13727</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ROANOKE</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>24036</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>2008-12-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>34.99</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.15</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1480.244</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares purchased pursuant to the Restricted Stock Plan for Outside Directors of RGC Resources, Inc.</footnote>
        <footnote id="F2">1,480.244 shares owned directly by insider and includes 15.410 restricted shares purchased through dividends reinvested in the Restricted Stock Plan for Outside Directors of RGC Resources, Inc.

101.000 shares owned indirectly by spouse</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Nancy H. Agee by Howard T. Lyon, POA dated 01/14/05</signatureName>
        <signatureDate>2008-12-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
