<SUBMISSION>
<ACCESSION-NUMBER>0001013321-05-000009
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20050701
<FILING-DATE>20050705
<DATE-OF-FILING-DATE-CHANGE>20050705
<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>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>LOGAN GEORGE W
<CIK>0001013321
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>000-26591
<FILM-NUMBER>05936079
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>5403449230
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>P O BOX 1190
<CITY>SALEM
<STATE>VA
<ZIP>24153
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-07-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001013321</rptOwnerCik>
            <rptOwnerName>LOGAN GEORGE W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P O BOX 1190</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SALEM</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>24153</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>2005-07-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>37.736</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>26.5</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>17333.757</value>
                </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>
    </footnotes>

    <ownerSignature>
        <signatureName>George W. Logan by Howard T. Lyon, POA dated 10/01/02</signatureName>
        <signatureDate>2005-07-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
