LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS
Know all by these presents, that the undersigned hereby
constitutes and appoints each of Steve J. Beilke, George Ann
Biros, Michael M. Dai, Maureen C. Faricy, and Gregg M. Larson,
each acting individually, as the undersigned's true and lawful
attorney-in-fact, with full power and authority as hereinafter
described on behalf of and in the name, place and stead of the
undersigned to:
(1)	prepare, execute, acknowledge, deliver and file
Forms 3, 4, and 5 (including any amendments thereto) with
respect to the securities of 3M Company, a Delaware corporation
(the "Company"), with the United States Securities and Exchange
Commission, any national securities exchanges and the Company,
as considered necessary or advisable under Section 16(a) of the
Securities Exchange Act of 1934 and the rules and regulations
promulgated thereunder, as amended from time to time (the
"Exchange Act");
(2)	seek or obtain, as the undersigned's representative
and on the undersigned's behalf, information on transactions in
the Company's securities from any third party, including
brokers, employee benefit plan administrators and trustees, and
the undersigned hereby authorizes any such person to release any
such information to the undersigned and approves and ratifies
any such release of information; and
(3)	perform any and all other acts which in the discretion
of such attorney-in-fact are necessary or desirable for and on
behalf of the undersigned in connection with the foregoing.
The undersigned acknowledges that:
(1)	this Power of Attorney authorizes, but does not
require, each such attorney-in-fact to act in their discretion
on information provided to such attorney-in-fact without
independent verification of such information;
(2)	any documents prepared and/or executed by either such
attorney-in-fact on behalf of the undersigned pursuant to this
Power of Attorney will be in such form and will contain such
information and disclosure as such attorney-in-fact, in his or
her discretion, deems necessary or desirable;
(3)	neither the Company nor either of such attorneys-in-
fact assumes (i) any liability for the undersigned's
responsibility to comply with the requirement of the Exchange
Act, (ii) any liability of the undersigned for any failure to
comply with such requirements, or (iii) any obligation or
liability of the undersigned for profit disgorgement under
Section 16(b) of the Exchange Act; and
(4)	this Power of Attorney does not relieve the
undersigned from responsibility for compliance with the
undersigned's obligations under the Exchange Act, including
without limitation the reporting requirements under Section 16
of the Exchange Act.
The undersigned hereby gives and grants each of the
foregoing attorneys-in-fact full power and authority to do and
perform all and every act and thing whatsoever requisite,
necessary or appropriate to be done in and about the foregoing
matters as fully to all intents and purposes as the undersigned
might or could do if present, hereby ratifying all that each
such attorney-in-fact of, for and on behalf of the undersigned,
shall lawfully do or cause to be done by virtue of this Limited
Power of Attorney.
This Power of Attorney shall remain in full force and
effect until the undersigned is no longer required to file Forms
3, 4, and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 17th day of September, 2004.

					/s/Robert D. MacDonald III



STATE OF MINNESOTA		)
					)  ss.
COUNTY OF RAMSEY		)
On this 17th day of September, Robert D. MacDonald III
personally appeared before me, and acknowledged that s/he
executed the foregoing instrument for the purposes therein
contained.
IN WITNESS WHEREOF, I have hereunto set my hand and
official seal.

Karen Stanoch Sawczuk

Notary Public

My Commission Expires:   January
31, 2005