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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-11-14</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001201792</issuerCik>
        <issuerName>AMERICAN PUBLIC EDUCATION INC</issuerName>
        <issuerTradingSymbol>APEI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001365552</rptOwnerCik>
            <rptOwnerName>Camden Partners Strategic Manager, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 EAST PRATT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001317017</rptOwnerCik>
            <rptOwnerName>Camden Partners Strategic III, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 EAST PRATT STREET,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001283497</rptOwnerCik>
            <rptOwnerName>CAMDEN PARTNERS STRATEGIC FUND III LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 EAST PRATT STREET,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Managing Member</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001283498</rptOwnerCik>
            <rptOwnerName>CAMDEN PARTNERS STRATEGIC FUND III-A LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 EAST PRATT STREET,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Managing Member</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001211905</rptOwnerCik>
            <rptOwnerName>BERKELEY RICHARD M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CAMDEN PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>500 EAST PRATT STREET, SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>n/a</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001211899</rptOwnerCik>
            <rptOwnerName>HUGHES DONALD W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CAMDEN PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>500 EAST PRATT STREET, SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>n/a</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001211913</rptOwnerCik>
            <rptOwnerName>JOHNSTON RICHARD M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 EAST PRATT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>n/a</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001025664</rptOwnerCik>
            <rptOwnerName>WARNOCK DAVID L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 EAST PRATT STREET,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>25414</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, par value $.01</value>
            </securityTitle>
            <transactionDate>
                <value>2007-11-14</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1760000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1760000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote 2</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $.01</value>
            </securityTitle>
            <transactionDate>
                <value>2007-11-14</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1148</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1761148</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote 5</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock, par value $.01</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-11-14</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1760000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1760000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote 2</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Class A Common Stock (&quot;Class A Common&quot;) converted into American Public Education, Inc. common stock on a 1-for-1 basis and had no expiration date.</footnote>
        <footnote id="F2">Fund III is the direct beneficial owner of 1,689,776 Class A Common and Fund III-A is the direct beneficial owner of 70,224 Class A Common. CPSM, CPS III and the Managing Members may be deemed indirect beneficial owners of the Class A Common owned by the Funds as a result of the relationships described in the Remarks section. CPSM, CPS III and each of the Managing Members disclaims beneficial ownership of the Class A Common held directly by the Funds, except to the extent of its or his pecuniary interest therein. Each of the Funds disclaims beneficial ownership of the Class A Common held by the other, except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F3">Awards vest on the earlier of the one year anniversary of the date of grant and immediately prior to the 2008 Annual Meeting of stockholders.</footnote>
        <footnote id="F4">Restricted Stock Award to David A. Warnock pursuant to the American Public Education, Inc. 2007 Omnibus Incentive Plan.</footnote>
        <footnote id="F5">Consists of 1,689,776 shares owned by Fund III, 70,224 shares owned by Fund III-A, and 1,148 shares owned by David A. Warnock.  The Funds, CPSM, CPS III and each of the Managing Members disclaims beneficial ownership of the shares owned by David A. Warnock, except to the extent of its or his pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>This report is being filed by Camden Partners Strategic Manager, LLC, as the managing member of Camden Partners Strategic III, LLC. This report includes reports by members of Camden Partners Strategic Fund III, L.P. and Camden Partners Strategic Fund III-A, L.P. Thisreport is being filed jointly by Camden Partners Strategic Manager, LLC (&quot;CPSM&quot;), Camden Partners Strategic III, LLC (&quot;CPS III&quot;), Camden Partners Strategic Fund III, L.P. (&quot;Fund III&quot;), Camden Partners Strategic Fund III-A, L.P. (&quot;Fund III-A&quot;), Donald W. Hughes, David L. Warnock, Richard Johnston and Richard Berkeley (the &quot;Managing Members&quot;) (collectively, the &quot;Reporting Persons&quot;). The Managing Members are the managing members of CPSM, which is the managing member of CPS III. CPS III is the General Partner of Fund III and Fund III-A (such funds together, the &quot;Funds&quot;). David L. Warnock is a director of the issuer.</remarks>

    <ownerSignature>
        <signatureName>/s/ Camden Partners Strategic III, LLC
By Donald W. Hughes, Managing Member</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Camden Partners Strategic III, LLC, By Donald W. Hughes, Managing Member</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Camden Partners Strategic Fund III, LP By Camden Partners Strategic III, LLC, its General Partner  By Camden Partners Strategic Manager, LLC, its Managing Member  By Donald W. Hughes, Managing Member</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Camden Partners Strategic Fund III-A, LP  By Camden Partners Strategic III, LLC, its General Partner  By Camden Partners Strategic Manager, LLC, it's Managing Member  By Donald W. Hughes, Managing Member</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald W. Hughes, Attorney-in-Fact</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald W. Hughes</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald W. Hughes, Attorney-in-Fact</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald W. Hughes, Attorney-in-Fact</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
