3M CO — Director's Dealing 2004

May 5, 2004

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2004-05-03

Reporting Person: NELSON RONALD G (VICE PRESIDENT & CONTROLLER)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-02-05	Common Stock	G	660	—	Disposed	35633	Direct
2004-05-03	Common Stock	M	2046	$24.1186	Acquired	37865	Direct
2004-05-03	Common Stock	F	567	$86.96	Disposed	37298	Direct
2004-05-03	Common Stock	M	1022	$62.3	Acquired	38320	Direct
2004-05-03	Common Stock	F	732	$86.96	Disposed	37588	Direct
2004-05-03	Common Stock	F	94	$86.96	Disposed	37494	Direct
2004-05-03	Common Stock	M	528	$62.3	Acquired	38022	Direct
2004-05-03	Common Stock	F	378	$86.96	Disposed	37644	Direct
2004-05-03	Common Stock	F	48	$86.96	Disposed	37596	Direct
2004-05-03	Common Stock	M	1706	$69.35	Acquired	39302	Direct
2004-05-03	Common Stock	F	1360	$86.96	Disposed	37942	Direct
2004-05-03	Common Stock	F	112	$86.96	Disposed	37830	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2004-05-03	Incentive Stock Option (right to buy)	$24.1186	M	2046	Disposed	2004-05-10	Common Stock (2046)	Direct
2004-05-03	Non-Qualified Stock Option (right to buy)	$62.3	M	1022	Disposed	2004-05-07	Common Stock (1022)	Direct
2004-05-03	Non-Qualified Stock Option (right to buy)	$62.3	M	528	Disposed	2004-05-07	Common Stock (528)	Direct
2004-05-03	Non-Qualified Stock Option (right to buy)	$69.35	M	1706	Disposed	2004-05-07	Common Stock (1706)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1903	Indirect