FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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 * Woodworth John K   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 CORP SC OPERTNS (Last) (First) (Middle) 3M CENTER 3. Date of Earliest Transaction (Month/Day/Year) 05/03/2012 (Street) ST. PAUL, MN 55144-1000 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(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 Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/03/2012   M   15,018 (1) A $ 84.4 29,198 D   Common Stock 05/03/2012   F   14,179 (1) D $ 89.39 15,019 D   Common Stock 05/03/2012   F   357 (1) D $ 89.39 14,662 D   Common Stock 05/03/2012   M   30,532 A $ 54.11 45,194 D   Common Stock 05/03/2012   S   43 D $ 89.32 45,151 D   Common Stock 05/03/2012   S   1,499 D $ 89.33 43,652 D   Common Stock 05/03/2012   S   1,052 D $ 89.34 42,600 D   Common Stock 05/03/2012   S   5,832 D $ 89.35 36,768 D   Common Stock 05/03/2012   S   6,516 D $ 89.36 30,252 D   Common Stock 05/03/2012   S   1,945 D $ 89.37 28,307 D   Common Stock 05/03/2012   S   2,626 D $ 89.38 25,681 D   Common Stock 05/03/2012   S   2,151 D $ 89.39 23,530 D   Common Stock 05/03/2012   S   1,792 D $ 89.4 21,738 D   Common Stock 05/03/2012   S   1,936 D $ 89.41 19,802 D   Common Stock 05/03/2012   S   1,957 D $ 89.42 17,845 D   Common Stock 05/03/2012   S   1,383 D $ 89.43 16,462 D   Common Stock 05/03/2012   S   1,600 D $ 89.44 14,862 D   Common Stock 05/03/2012   S   100 D $ 89.4415 14,762 D   Common Stock 05/03/2012   S   100 D $ 89.445 14,662 (2) D   Common Stock               903.58 (3) I By Corporation

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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 Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Non-qualified Stock Option (Right to Buy)

$ 84.4

05/03/2012

M

15,018 (1)

05/12/2005

05/09/2014

Common Stock

15,018

$ 0

1,744

D

Non-qualified Stock Option (Right to Buy)

$ 54.11

05/03/2012

M

30,532

02/09/2010

02/08/2019

Common Stock

30,532

$ 0

0

D

Non-qualified Stock Option (Right to Buy)

$ 89.39

05/03/2012

A

14,536

11/03/2012

05/09/2014

Common Stock

14,536

$ 89.39

14,536

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Woodworth John K 3M CENTER ST. PAUL, MN 55144-1000			VICE PRESIDENT CORP SC OPERTNS

Signatures

George Ann Biros, attorney-in-fact for John K. Woodworth		05/07/2012
**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)	This Form is being filed to report the exercise of a 3M stock option for a total of 15,018 shares by means of a stock swap. A stock swap is a method of exercising a stock option in which the option holder attests to the ownership of enough shares of stock already owned by the option holder to cover the exercise price of the option being exercised. As a result of this stock swap, the reporting person acquired ownership of an additional 482 shares of 3M common stock. As a result of this transaction, 357 shares were sold to pay withholding taxes to the respective government agencies.
(2)	Includes shares acquired pursuant to 3M's Dividend Reinvestment Plan.
(3)	Includes dividend share equivalents, accrued quarterly, pursuant to 3M's Performance Awards Deferred Compensation Plan.

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