-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 5kZqCn4GAJlnpq6UA0lYdw==

<SEC-DOCUMENT>0000066740-05-000052.txt : 20050203
<SEC-HEADER>0000066740-05-000052.hdr.sgml : 20050203
<ACCEPTANCE-DATETIME>20050203110803
ACCESSION NUMBER:		0000066740-05-000052
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041231
FILED AS OF DATE:		20050203
DATE AS OF CHANGE:		20050203

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SCHMOLL WILLIAM J
		CENTRAL INDEX KEY:			0001281647

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03285
		FILM NUMBER:		05571875

	MAIL ADDRESS:	
		STREET 1:		3N CENTER
		STREET 2:		BLDG 022405 N 40
		CITY:			ST PAUL
		STATE:			MN
		ZIP:			55144

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>5
<SEQUENCE>1
<FILENAME>a5.xml
<DESCRIPTION>5
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2004-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000066740</issuerCik>
        <issuerName>3M CO</issuerName>
        <issuerTradingSymbol>MMM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001281647</rptOwnerCik>
            <rptOwnerName>SCHMOLL WILLIAM J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3M CENTER</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PAUL</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55144-1000</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President Taxes&amp;Treasurer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10893</value>
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            <ownershipNature>
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                    <value>D</value>
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                <footnoteId id="F2"/>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1589</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by 401k/PAESOP</value>
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        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
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            <conversionOrExercisePrice>
                <value>43.35</value>
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            <exerciseDate>
                <value>2001-05-09</value>
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            <expirationDate>
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                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>1998-05-13</value>
            </exerciseDate>
            <expirationDate>
                <value>2007-05-13</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>1999-05-12</value>
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            <expirationDate>
                <value>2008-05-12</value>
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            <underlyingSecurity>
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                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Incentive Stock Option (right to buy)</value>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>2000-05-11</value>
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            <expirationDate>
                <value>2009-05-10</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Incentive Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>58.625</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2002-05-08</value>
            </exerciseDate>
            <expirationDate>
                <value>2011-05-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1704</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1704</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>57.7</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2001-06-08</value>
            </exerciseDate>
            <expirationDate>
                <value>2006-05-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>1666</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
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            <conversionOrExercisePrice>
                <value>57.7</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2001-06-08</value>
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            <expirationDate>
                <value>2007-05-13</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>310</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
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            <conversionOrExercisePrice>
                <value>58.625</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2002-05-08</value>
            </exerciseDate>
            <expirationDate>
                <value>2011-05-08</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
                    <value>3040</value>
                </underlyingSecurityShares>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3040</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
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            <conversionOrExercisePrice>
                <value>61.85</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-05-14</value>
            </exerciseDate>
            <expirationDate>
                <value>2013-05-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>16432</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16432</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>2002-10-09</value>
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            <expirationDate>
                <value>2008-05-09</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
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        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
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                    <value>D</value>
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            <conversionOrExercisePrice>
                <value>71.1</value>
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            <exerciseDate>
                <value>2004-02-29</value>
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            <expirationDate>
                <value>2005-05-06</value>
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            <underlyingSecurity>
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                <underlyingSecurityShares>
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                    <value>D</value>
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            <conversionOrExercisePrice>
                <value>71.1</value>
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            <exerciseDate>
                <value>2004-02-29</value>
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            <expirationDate>
                <value>2007-05-13</value>
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            <underlyingSecurity>
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                <underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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        <derivativeHolding>
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            <conversionOrExercisePrice>
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                <value>2004-02-29</value>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                    <value>1880</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>71.1</value>
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            <exerciseDate>
                <value>2004-02-29</value>
            </exerciseDate>
            <expirationDate>
                <value>2010-05-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>6034</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6034</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>84.4</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2005-05-12</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-05-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23339</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>23339</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>85.5</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-10-22</value>
            </exerciseDate>
            <expirationDate>
                <value>2011-05-06</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8717</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8717</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The directly-held common stock holding reported in Table I includes shares acquired pursuant to 3M's Dividend Reinvestment Program in transactions exempt from Section 16; this total also includes shares acquired during the fiscal year pursuant to 3M's General Employee Stock Purchase Plan.</footnote>
        <footnote id="F2">The indirectly-held common stock holding (401k/PAESOP) reported in Table I includes shares acquired during the fiscal year pursuant to the 3M Voluntary Investment Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: George Ann Biros For: William J Schmoll</signatureName>
        <signatureDate>2005-02-03</signatureDate>
    </ownerSignature>
</ownershipDocument>

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