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| <?xml version="1.0" encoding="windows-1252"?> |
| <ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2020-06-01 </periodOfReport> |
| <issuer> |
| | <issuerCik> 0000883945 </issuerCik> |
| | <issuerName> USA TRUCK INC </issuerName> |
| | <issuerTradingSymbol> USAK </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001688869 </rptOwnerCik> |
| | | <rptOwnerName> Reed James D </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> 3200 INDUSTRIAL PARK ROAD </rptOwnerStreet1> |
| | | <rptOwnerStreet2></rptOwnerStreet2> |
| | | <rptOwnerCity> VAN BUREN </rptOwnerCity> |
| | | <rptOwnerState> AR </rptOwnerState> |
| | | <rptOwnerZipCode> 72956 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> true </isDirector> |
| | | <isOfficer> true </isOfficer> |
| | | <isTenPercentOwner> false </isTenPercentOwner> |
| | | <isOther> false </isOther> |
| | | <officerTitle> PRESIDENT, CEO </officerTitle> |
| | | <otherText></otherText> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2020-06-01 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 5 </transactionFormType> |
| <transactionCode> A </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 75000 </value> |
| <footnoteId id="F1"/> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 0 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> A </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 263346 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| <natureOfOwnership> |
| <value></value> |
| </natureOfOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | </nonDerivativeTable> |
| <derivativeTable></derivativeTable> |
| <footnotes> |
| | <footnote id="F1"> Represents an award of restricted stock to the reporting person, subject to the achievement of certain performance conditions. If the performance conditions are achieved, the award will vest on the second anniversary of the date of grant, subject to continued employment and certain forfeiture and termination provisions. </footnote> |
| | </footnotes> |
| <ownerSignature> |
| | <signatureName> /s/ Zachary B. King, Attorney-in-Fact </signatureName> |
| | <signatureDate> 2020-06-03 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |
