<SUBMISSION>
<ACCESSION-NUMBER>0001067837-13-000052
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20131222
<FILING-DATE>20131223
<DATE-OF-FILING-DATE-CHANGE>20131223
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>ENTERCOM COMMUNICATIONS CORP
<CIK>0001067837
<ASSIGNED-SIC>4832
<IRS-NUMBER>231701044
<STATE-OF-INCORPORATION>PA
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>401 CITY AVENUE
<STREET2>SUITE 809
<CITY>BALA CYNWYD
<STATE>PA
<ZIP>19004
<PHONE>610-660-5610
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>401 CITY AVENUE
<STREET2>SUITE 809
<CITY>BALA CYNWYD
<STATE>PA
<ZIP>19004
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>FIELD DAVID J
<CIK>0001106858
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-14461
<FILM-NUMBER>131294821
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>401 CITY AVENUE
<STREET2>SUITE 809
<CITY>BALA CYNWYD
<STATE>PA
<ZIP>19004
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2013-12-22</periodOfReport>

    <issuer>
        <issuerCik>0001067837</issuerCik>
        <issuerName>ENTERCOM COMMUNICATIONS CORP</issuerName>
        <issuerTradingSymbol>ETM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001106858</rptOwnerCik>
            <rptOwnerName>FIELD DAVID J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ENTERCOM COMMUNICATIONS CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>401 E. CITY AVENUE, SUITE 809</rptOwnerStreet2>
            <rptOwnerCity>BALA CYNWYD</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock, par value $.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2013-12-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>150000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1285225</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock, par value $.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2013-12-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>47362</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.95</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1237863</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock, par value $.01 per share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1566542</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On December 23, 2010, the Reporting Person was granted 225,000 shares of restricted stock subject to performance based vesting.  The acquisition of these resricted shares was reported on a Form 4 on December 28, 2010.  The measurement period to determine the vesting of these shares ended on December 22, 2013.  In accordance with the vesting criteria set forth in the grant instrument, one-third of these shares vested, while the remaining two-thirds were forfeited.</footnote>
        <footnote id="F2">These shares were retained by the Issuer in order to satisfy the tax obligations of the reporting person in connection with the vesting of shares of restricted stock.</footnote>
        <footnote id="F3">These shares are indirectly beneficially owned by the Reporting Person as follows: (i) 206,094 shares held by a trust for the benefit of the sister of the Reporting Person for which the Reporting Person is a co-trustee: (ii) 438,876 shares held by a trust for the benefit of the Reporting Person for which the Reporting Person is a co-trustee; (iii) 423,286 shares held by a trust for the benefit of the issue of the sister of the Reporting Person for which the Reporting Person is a co-trustee; and (iv) 498,286 shares held by a trust for the benefit of the issue of the Reporting Person for which the Reporting Person is a co-trustee.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>David J. Field by Andrew P. Sutor, IV, authorized signatory</signatureName>
        <signatureDate>2013-12-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
