Ownership Submission
FORM 5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Form 3 Holdings Reported
Form 4 Transactions Reported
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

ANNUAL STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
MAHAN JAMES T
 2. Issuer Name and Ticker or Trading Symbol
3M CO [MMM] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VICE PRESIDENT ENGRG MFG & LOG
(Last)
(First)
(Middle)

3M CENTER BLDG 0220 11 02		 3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2004
(Street)


ST PAUL, MN 551441000		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Reporting
(check applicable line)

_X_ Form Filed by One Reporting Person
___ Form Filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned at end of Issuer's Fiscal Year
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Amount (A) or (D) Price
Common Stock (1) 09/24/2004   G 50 D $ 0 18,162 D  
Common Stock             3,440 I by 401k/PAESOP Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 2270 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned at End of Issuer's Fiscal Year
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
(A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Incentive Stock Option (right to buy) $ 31.5175           05/14/1997 05/14/2006 Common Stock
3,172
  3,172
D
 
Incentive Stock Option (right to buy) $ 43.35           05/09/2001 05/09/2010 Common Stock
2,306
  2,306
D
 
Incentive Stock Option (right to buy) $ 45.85           05/13/1998 05/13/2007 Common Stock
2,180
  2,180
D
 
Incentive Stock Option (right to buy) $ 46.675           05/12/1999 05/12/2008 Common Stock
2,142
  2,142
D
 
Incentive Stock Option (right to buy) $ 47.5           05/11/2000 05/10/2009 Common Stock
2,104
  2,104
D
 
Incentive Stock Option (right to buy) $ 58.625           05/08/2002 05/08/2011 Common Stock
1,704
  1,704
D
 
Non-Qualified Stock Option (right to buy) $ 58.625           05/08/2002 05/08/2011 Common Stock
8,106
  8,106
D
 
Non-Qualified Stock Option (right to buy) $ 61.85           05/14/2004 05/12/2013 Common Stock
26,400
  26,400
D
 
Non-Qualified Stock Option (right to buy) $ 62.65           12/03/2002 05/06/2005 Common Stock
940
  940
D
 
Non-Qualified Stock Option (right to buy) $ 62.65           12/03/2002 05/12/2006 Common Stock
1,270
  1,270
D
 
Non-Qualified Stock Option (right to buy) $ 62.65           12/03/2002 05/11/2007 Common Stock
1,410
  1,410
D
 
Non-Qualified Stock Option (right to buy) $ 62.65           12/03/2002 05/12/2008 Common Stock
7,008
  7,008
D
 
Non-Qualified Stock Option (right to buy) $ 62.65           12/03/2002 05/11/2009 Common Stock
6,536
  6,536
D
 
Non-Qualified Stock Option (right to buy) $ 64.5           09/19/2003 05/12/2006 Common Stock
252
  252
D
 
Non-Qualified Stock Option (right to buy) $ 64.5           09/19/2003 05/11/2007 Common Stock
5,364
  5,364
D
 
Non-Qualified Stock Option (right to buy) $ 64.5           09/19/2003 05/11/2009 Common Stock
560
  560
D
 
Non-Qualified Stock Option (right to buy) $ 64.5           09/19/2003 05/07/2010 Common Stock
6,444
  6,444
D
 
Non-Qualified Stock Option (right to buy) $ 64.5           09/19/2004 05/06/2011 Common Stock
5,632
  5,632
D
 
Non-Qualified Stock Option (right to buy) $ 64.5           05/15/2003 05/14/2012 Common Stock
15,800
  15,800
D
 
Non-Qualified Stock Option (right to buy) $ 84.4           05/12/2005 05/09/2014 Common Stock
35,132
  35,132
D
 

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
MAHAN JAMES T
3M CENTER BLDG 0220 11 02
ST PAUL, MN 551441000		       VICE PRESIDENT ENGRG MFG & LOG  

Signatures

By: George Ann Biros For: James T Mahan 12/31/2004
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) 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. 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.

Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.