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                                                                EXHIBIT 99.2


Certification of Chief Financial Officer Pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350

In connection with the Annual Report of 3M Company (the "Company") on Form 10-
K for the period ended December 31, 2002 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Patrick D. Campbell,
Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002,
that, to my knowledge:
(1) The Report fully complies with the requirements of Section 13(a) or 15(d)
of the Securities Exchange Act of 1934; and
(2) The information contained in the Report fairly presents, in all material
respects, the financial condition and results of operations of the Company.


/s/ Patrick D. Campbell
- ---------------------------
Patrick D. Campbell
Chief Financial Officer

March 10, 2003