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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 SBmNZqRqZE4QVm7BjaCMdW1wS64fjsEKourVf8vsw9i+L7zlgXhVux7qhdGYjeHM
 jFB0o8NhAX+f+pHVQSa8HA==

<SEC-DOCUMENT>0001054290-03-000004.txt : 20030905
<SEC-HEADER>0001054290-03-000004.hdr.sgml : 20030905
<ACCEPTANCE-DATETIME>20030905113318
ACCESSION NUMBER:		0001054290-03-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030903
FILED AS OF DATE:		20030905

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COWELL AARON D JR
		CENTRAL INDEX KEY:			0001182803

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24061
		FILM NUMBER:		03882979

	MAIL ADDRESS:	
		STREET 1:		6801 MORRISON BLVD
		CITY:			CHAROLLTE
		STATE:			NC
		ZIP:			28211

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			US LEC CORP
		CENTRAL INDEX KEY:			0001054290
		STANDARD INDUSTRIAL CLASSIFICATION:	TELEPHONE COMMUNICATIONS (NO RADIO TELEPHONE) [4813]
		IRS NUMBER:				562065535
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		6801 MORRISON BOULEVARD
		STREET 2:		MORROCROFT III
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28211
		BUSINESS PHONE:		704-319-1000

	MAIL ADDRESS:	
		STREET 1:		6801 MORRISON BOULEVARD
		STREET 2:		MORROCROFT III
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28211
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-09-03</periodOfReport>
    <issuer>
        <issuerCik>0001054290</issuerCik>
        <issuerName>US LEC CORP</issuerName>
        <issuerTradingSymbol>CLEC</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001182803</rptOwnerCik>
            <rptOwnerName>COWELL AARON D JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6801 MORRISON BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2>MORROCROFT III</rptOwnerStreet2>
            <rptOwnerCity>CHARLOTTE</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28211</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>President &amp; CEO</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeHolding><securityTitle><value>Class A Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>21513.7</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeTransaction><securityTitle><value>Employee Stock Option (right to buy)</value></securityTitle><conversionOrExercisePrice><value>4.15</value></conversionOrExercisePrice><transactionDate><value>2003-09-03</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0
</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>100000</value></transactionShares><transactionPricePerShare><value>4.15</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F1"/></exerciseDate><expirationDate><value>2013-09-03</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Class A Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>100000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>560000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Option granted under the Company's 1998 Omnibus Stock Pl
an and will vest in four equal installments beginning on the first anniversary date of each individual grant.</footnote></footnotes><remarks/><ownerSignature><signatureName>Aaron D. Cowell</signatureName><signatureDate>2003-09-05</signatureDate></ownerSignature></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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