-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 LxckoVa5cRChsRTQmeBxLihAPAM1RvCmpaiqL1qvFf8n+u7cRge2NyTMtu8C4QRG
 iTqbugFtKl4/3UAme6f0rQ==

<SEC-DOCUMENT>0001222540-10-000009.txt : 20100802
<SEC-HEADER>0001222540-10-000009.hdr.sgml : 20100802
<ACCEPTANCE-DATETIME>20100802204228
ACCESSION NUMBER:		0001222540-10-000009
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100731
FILED AS OF DATE:		20100802
DATE AS OF CHANGE:		20100802

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HUME FREDERICK R
		CENTRAL INDEX KEY:			0001222540

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10394
		FILM NUMBER:		10985486

	MAIL ADDRESS:	
		STREET 1:		DATA IO CORP
		STREET 2:		10525 WILLOWS RD NE PO BOX 97046
		CITY:			REDMOND
		STATE:			WA
		ZIP:			98073-9746

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DATA I/O CORP
		CENTRAL INDEX KEY:			0000351998
		STANDARD INDUSTRIAL CLASSIFICATION:	INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS [3825]
		IRS NUMBER:				910864123
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1210

	BUSINESS ADDRESS:	
		STREET 1:		6464 185TH AVE NE, SUITE 101
		CITY:			REDMOND
		STATE:			WA
		ZIP:			98052
		BUSINESS PHONE:		4258676922

	MAIL ADDRESS:	
		STREET 1:		6464 185TH AVE NE, SUITE 101
		CITY:			REDMOND
		STATE:			WA
		ZIP:			98052
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-07-31</periodOfReport>

    <issuer>
        <issuerCik>0000351998</issuerCik>
        <issuerName>DATA I/O CORP</issuerName>
        <issuerTradingSymbol>DAIO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001222540</rptOwnerCik>
            <rptOwnerName>HUME FREDERICK R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6464 185TH AVE. NE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 101</rptOwnerStreet2>
            <rptOwnerCity>REDMOND</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98052</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>PRESIDENT AND CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2010-07-31</value>
                <footnoteId id="F2"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>765</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>4.7025</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>153193</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares were acquired through Company's 1982 Employee Stock Purchase Plan</footnote>
        <footnote id="F2">Used Friday, July 30, 2010 close price</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Joel S. Hatlen, by Power of Attorney</signatureName>
        <signatureDate>2010-08-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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