3M CO — Director's Dealing 2006

May 11, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2006-05-09

Reporting Person: BRENNAN EDWARD A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-05-09	Common Stock	A	571	$75.69	Acquired	39478	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	252	Direct

Footnotes

F1: This nonemployee director has elected to defer all or a portion of compensation otherwise payable in cash to a common stock equivalents account under the terms of 3M's Director Compensation Plan and has no voting or investment powers with respect to such account. The indirectly-held common stock holding (by Corporation) reported in Table I includes deferred dividend reinvestment shares acquired pursuant to 3M's Director Compensation Plan.