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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FNdzYEDS7idv4Wpn3opxugiUkx6mRTC3xe5P82NGG89iRItL0iCvrTPiyk5c40xT
 HdavCwZzikBpEjpFIKYQOQ==

<SEC-DOCUMENT>0001209191-03-010255.txt : 20030702
<SEC-HEADER>0001209191-03-010255.hdr.sgml : 20030702
<ACCEPTANCE-DATETIME>20030702170229
ACCESSION NUMBER:		0001209191-03-010255
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030702
FILED AS OF DATE:		20030702

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BEDELL MATHIAS  B
		CENTRAL INDEX KEY:			0001235351

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-15137
		FILM NUMBER:		03772689

	BUSINESS ADDRESS:	
		STREET 1:		300 STEBENS LANDING #406
		CITY:			MARCO ISLAND
		STATE:			FL
		ZIP:			33969
		BUSINESS PHONE:		781 942 8120

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MASSBANK CORP
		CENTRAL INDEX KEY:			0000799166
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				042930382
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		123 HAVEN STREET
		CITY:			READING
		STATE:			MA
		ZIP:			01867
		BUSINESS PHONE:		6179428192

	MAIL ADDRESS:	
		STREET 1:		123 HAVEN STREET
		CITY:			READING
		STATE:			PA
		ZIP:			01867
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-07-02</periodOfReport><issuer><issuerCik>0000799166</issuerCik><issuerName>MASSBANK CORP</issuerName>        <issuerTradingSymbol>MASB</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001235351</rptOwnerCik><rptOwnerName>BEDELL MATHIAS  B</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle></officerTitle><otherText></otherText></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>Deferred Compensation</value><footnoteId id="F1" /><footnoteId id="F2" /></securityTitle><c
onversionOrExercisePrice><value>30.06</value></conversionOrExercisePrice><transactionDate><value>2003-05-22</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>81.3578</value></transactionShares><transactionValue><value>30.06</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2003-07-01</value></exerciseDate><expirationDate><value>2003-07-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common</value></underlyingSecurityTitle><underlyingSecurityShares><value>81.357</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10713.9488</value></sharesOwnedFollowingTransaction></postTran
sactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><derivativeSecurity><securityTitle><value>Deferred Compensation</value><footnoteId id="F1" /></securityTitle><conversionOrExercisePrice><value>36.25</value></conversionOrExercisePrice><transactionDate><value>2003-07-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>41.3793</value></transactionShares><transactionValue><value>36.25</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2003-07-01</value></exerciseDate><expirationDate><value>2003-07-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common</
value></underlyingSecurityTitle><underlyingSecurityShares><value>41.3793</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10755.3281</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">Cash-only security issued pursuant to the Directors'Deferred Compensation Plan</footnote><footnote id="F2">Represents the reinvestment of dividends pursuant to the Directors' Deferred Compensation Plan</footnote></footnotes><ownerSignature><signatureName>David F. Carroll, Attorney-In-Fact for Mathias B. Bedell</signatureName><signatureDate>2003-07-02</signatureDate></ownerSignature></ownershipDocument>

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</SEC-DOCUMENT>
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