<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-07-22</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001325670</issuerCik>
        <issuerName>Southern National Bancorp of Virginia Inc</issuerName>
        <issuerTradingSymbol>SONA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001239905</rptOwnerCik>
            <rptOwnerName>DERRICO GEORGIA S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2954 BURRLAND LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>THE PLAINS</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>20198</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman of the Board</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001249469</rptOwnerCik>
            <rptOwnerName>PORTER R RODERICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2954 BURRLAND LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>THE PLAINS</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>20198</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Southern National Bancorp of Virginia Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>314459</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Southern National Bancorp of Virginia Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>750</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Southern National Bancorp of Virginia Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>105376</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Southern National Bancorp of Virginia Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>45235</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Southern National Bancorp of Virginia Common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9390</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By 401k Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Warrants (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.09</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-10-21</value>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-10-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>16500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.09</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2005-12-31</value>
            </exerciseDate>
            <expirationDate>
                <value>2015-04-04</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>31300</value>
                    <footnoteId id="F7"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>31300</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.09</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2005-12-31</value>
            </exerciseDate>
            <expirationDate>
                <value>2015-11-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5500</value>
                    <footnoteId id="F8"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>36800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.2</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2009-01-23</value>
                <footnoteId id="F9"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-01-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20000</value>
                    <footnoteId id="F10"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>56800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.5</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2010-01-27</value>
                <footnoteId id="F11"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-01-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>22000</value>
                    <footnoteId id="F12"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>78800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.02</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2010-07-29</value>
                <footnoteId id="F13"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-07-29</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10000</value>
                    <footnoteId id="F14"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>88800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.04</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2011-07-27</value>
                <footnoteId id="F15"/>
            </exerciseDate>
            <expirationDate>
                <value>2020-07-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10000</value>
                    <footnoteId id="F16"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>98800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.2</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2012-03-21</value>
                <footnoteId id="F17"/>
            </exerciseDate>
            <expirationDate>
                <value>2021-03-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>40000</value>
                    <footnoteId id="F18"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>138800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.92</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2013-12-05</value>
                <footnoteId id="F19"/>
            </exerciseDate>
            <expirationDate>
                <value>2022-12-05</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>40000</value>
                    <footnoteId id="F20"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>178800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.14</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2014-06-21</value>
                <footnoteId id="F21"/>
            </exerciseDate>
            <expirationDate>
                <value>2023-06-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>40000</value>
                    <footnoteId id="F22"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>218800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10.47</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-07-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>48000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.47</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2015-07-22</value>
                <footnoteId id="F23"/>
            </exerciseDate>
            <expirationDate>
                <value>2024-07-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>48000</value>
                    <footnoteId id="F24"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>266800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These shares are owned jointly. Georgia S. Derrico and R. Roderick Porter are married.</footnote>
        <footnote id="F2">These shares are owned by Georgia S. Derrico.</footnote>
        <footnote id="F3">These shares are held in an IRA by Georgia S. Derrico.</footnote>
        <footnote id="F4">These shares are held in an IRA by R. Roderick Porter.</footnote>
        <footnote id="F5">These shares are held in a 401k plan as follows: 4682 by Georgia S. Derrico and 4708 by R. Roderick Porter.</footnote>
        <footnote id="F6">These warrants are owned as follows: 8250 by Georgia S. Derrico and 8250 by R. Roderick Porter.</footnote>
        <footnote id="F7">These options are owned as follows: 10500 by Georgia S. Derrico and 20800 by R. Roderick Porter.</footnote>
        <footnote id="F8">These options are owned as follows: 2750 by Georgia S. Derrico and 2750 by R. Roderick Porter.</footnote>
        <footnote id="F9">These options are exercisable as follows: 4000 on 1/23/2009, 4000 on 1/23/2010, 4000 on 1/23/2011, 4000 on 1/23/2012, 4000 on 1/23/2013</footnote>
        <footnote id="F10">These options are owned as follows: 10000 by Georgia S. Derrico and 10000 by R. Roderick Porter.</footnote>
        <footnote id="F11">These options are exercisable as follows: 4400 on 1/27/2010, 4400 on 1/27/2011, 4400 on 1/27/2012, 4400 on 1/27/2013, 4400 on 1/27/2014.</footnote>
        <footnote id="F12">These options are owned as follows: 11000 by Georgia S. Derrico and 11000 by R. Roderick Porter.</footnote>
        <footnote id="F13">These options are exercisable as follows: 2000 on 7/29/2010, 2000 on 7/29/2011, 2000 on 7/29/2012, 2000 on 7/29/2013, 2000 on 7/29/2014.</footnote>
        <footnote id="F14">These options are owned as follows: 5000 by Georgia S. Derrico and 5000 by R. Roderick Porter.</footnote>
        <footnote id="F15">These options are exercisable as follows: 2000 on 7/27/2011, 2000 on 7/27/2012, 2000 on 7/27/2013, 2000 on 7/27/2014, 2000 on 7/27/2015</footnote>
        <footnote id="F16">These options are owned as follows: 5000 by Georgia S. Derrico and 5000 by R. Roderick Porter.</footnote>
        <footnote id="F17">These options are exercisable as follows: 8000 on 3/21/2012, 8000 on 3/21/2013, 8000 on 3/21/2014, 8000 on 3/21/2015, 8000 on 3/21/2016.</footnote>
        <footnote id="F18">These options are owned as follows: 20000 by Georgia S. Derrico and 20000 by R. Roderick Porter.</footnote>
        <footnote id="F19">These options are exercisable as follows: 8000 on 12/5/2013, 8000 on 12/5/2014, 8000 on 12/5/2015, 8000 on 12/5/2016, 8000 on 12/5/2017</footnote>
        <footnote id="F20">These options are owned as follows: 20000 by Georgia S. Derrico and 20000 by R. Roderick Porter.</footnote>
        <footnote id="F21">These options are exercisable as follows: 8000 on 6/21/2014, 8000 on 6/21/2015, 8000 on 6/21/2016, 8000 on 6/21/2017, 8000 on 6/21/2018</footnote>
        <footnote id="F22">These options are owned as follows: 20000 by Georgia S. Derrico and 20000 by R. Roderick Porter.</footnote>
        <footnote id="F23">These options are exercisable as follows: 9600 on 7/22/2015, 9600 on 7/22/2016, 9600 on 7/22/2017, 9600 on 7/22/2018, 9600 on 7/22/2019</footnote>
        <footnote id="F24">These options are owned as follows: 24000 by Georgia S. Derrico and 24000 by R. Roderick Porter.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Georgia S.Derrico</signatureName>
        <signatureDate>2014-09-05</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>R. Roderick Porter</signatureName>
        <signatureDate>2014-09-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
