<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-07-08</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000790988</issuerCik><issuerName>PENNROCK FINANCIAL SERVICES CORP</issuerName>        <issuerTradingSymbol>prfs</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001219478</rptOwnerCik><rptOwnerName>GOOD LEWIS M</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>1060 MAIN STREET</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>BLUE BALL</rptOwnerCity><rptOwnerState>PA</rptOwnerState><rptOwnerZipCode>17506</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</value></securityTitle><transactionDate><value>2003-07-08</value></transactionDate><transactionCoding><transactionFormType>5</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value>E</value></transactionTimeliness><transactionAmounts><transactionShares><value>25.956</value></transactionShares><transactionPricePerShare><value>30.16</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>3940.227</value><footnoteId id="F1" /></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-07-08</value></transactionDate><transactionCoding><transactionFormType>5</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value>E</value></transactionTimeliness><transactionAmounts><transactionShares><value>1.264</value></transactionShares><transactionPricePerShare><value>30.16</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>191.792</value><footnoteId id="F2" /></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value><footnoteId id="F3" /></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes><footnote id="F1">Dividend Reinvestment Transaction</footnote><footnote id="F2">Dividend Reinvestment Transaction</footnote><footnote id="F3">Owned by Spouse</footnote></footnotes><remarks></remarks><ownerSignature><signatureName>/s/Lewis M. Good</signatureName><signatureDate>2003-08-08</signatureDate></ownerSignature></ownershipDocument>

