-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000066740-03-000024.txt : 20030619
<SEC-HEADER>0000066740-03-000024.hdr.sgml : 20030619
<ACCEPTANCE-DATETIME>20030619094959
ACCESSION NUMBER:		0000066740-03-000024
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030617
FILED AS OF DATE:		20030619

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GRENZ M KAY
		CENTRAL INDEX KEY:			0001196474

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03285
		FILM NUMBER:		03749584

	BUSINESS ADDRESS:	
		STREET 1:		MINNESOTA MINING & MANUFACTURING CO
		STREET 2:		3M CENTER
		CITY:			ST. PAUL
		STATE:			MN
		ZIP:			55133

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			3M CO
		CENTRAL INDEX KEY:			0000066740
		STANDARD INDUSTRIAL CLASSIFICATION:	CONVERTED PAPER & PAPERBOARD PRODS (NO CONTAINERS/BOXES) [2670]
		IRS NUMBER:				410417775
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3M CENTER
		STREET 2:		BLDG. 220-11W-02
		CITY:			ST PAUL
		STATE:			MN
		ZIP:			55144-1000
		BUSINESS PHONE:		6517332204

	MAIL ADDRESS:	
		STREET 1:		3M CENTER
		STREET 2:		BLDG. 220-11W-02
		CITY:			ST. PAUL
		STATE:			MN
		ZIP:			55144-1000

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MINNESOTA MINING & MANUFACTURING CO
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-06-17</periodOfReport>

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    <issuer>
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        <issuerName>3M CO</issuerName>
        <issuerTradingSymbol>MMM</issuerTradingSymbol>
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            <rptOwnerName>GRENZ M KAY</rptOwnerName>
        </reportingOwnerId>
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            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
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            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VICE PRESIDENT HR</officerTitle>
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    </reportingOwner>

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        <transactionDate>
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        <transactionAmounts>
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        </ownershipNature>
    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>96.85</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-06-17</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
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        </transactionCoding>
        <transactionAmounts>
            <transactionShares>
                <value>897</value>
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            <transactionValue>
                <value>0</value>
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            <transactionAcquiredDisposedCode>
                <value>D</value>
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        <exerciseDate>
            <value>1998-08-09</value>
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        <expirationDate>
            <value>2004-05-07</value>
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        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>897</value>
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                <value>0</value>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
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    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>117.25</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-06-17</value>
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        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>M</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionAmounts>
            <transactionShares>
                <value>3298</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
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            <transactionAcquiredDisposedCode>
                <value>D</value>
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        <exerciseDate>
            <value>2002-05-08</value>
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        <expirationDate>
            <value>2011-05-08</value>
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        <underlyingSecurity>
            <underlyingSecurityTitle>
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            <sharesOwnedFollowingTransaction>
                <value>15850</value>
            </sharesOwnedFollowingTransaction>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>129.75</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-06-17</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>A</transactionCode>
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        <transactionAmounts>
            <transactionShares>
                <value>747</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
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            <transactionAcquiredDisposedCode>
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        <exerciseDate>
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        <expirationDate>
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        <underlyingSecurity>
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        <ownershipNature>
            <directOrIndirectOwnership>
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    <derivativeSecurity>
        <securityTitle>
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        </securityTitle>
        <conversionOrExercisePrice>
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        </conversionOrExercisePrice>
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        <transactionAmounts>
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                <value>1658</value>
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            <transactionValue>
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        <exerciseDate>
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        <expirationDate>
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        <underlyingSecurity>
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    <derivativeSecurity>
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        </conversionOrExercisePrice>
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        <transactionAmounts>
            <transactionShares>
                <value>3345</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
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        <exerciseDate>
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        <expirationDate>
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        <underlyingSecurity>
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    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>129.75</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-06-17</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>A</transactionCode>
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        </transactionCoding>
        <transactionAmounts>
            <transactionShares>
                <value>7844</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
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            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>2003-12-17</value>
        </exerciseDate>
        <expirationDate>
            <value>2009-05-11</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>Common Stock</value>
            </underlyingSecurityTitle>
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                <value>7844</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
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            <sharesOwnedFollowingTransaction>
                <value>7844</value>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
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    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>129.75</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-06-17</value>
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        <transactionCoding>
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            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
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        <transactionAmounts>
            <transactionShares>
                <value>3090</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
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            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>2003-12-17</value>
        </exerciseDate>
        <expirationDate>
            <value>2011-05-06</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>3090</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
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            <sharesOwnedFollowingTransaction>
                <value>3090</value>
            </sharesOwnedFollowingTransaction>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
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        </ownershipNature>
    </derivativeSecurity>

    <ownerSignature>
        <signatureName>By: George Ann Biros  For: M. Kay Grenz</signatureName>
        <signatureDate>2003-06-17</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----