3M CO — Director's Dealing 2010

May 13, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-05-11

Reporting Person: ALVARADO LINDA G (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-11	Common Stock	A	1148	$83.57	Acquired	10477	Direct
2010-05-11	Common Stock	A	287	$83.57	Acquired	8936	Indirect

Footnotes

F1: Includes shares acquired pursuant to 3M's Dividend Reinvestment Plan.

F2: This non-employee director has elected to defer all or a portion of compensation otherwise payable in cash or stock to a common stock equivalents account under the terms of 3M's Compensation Plan for Non-employee Directors and has no voting or investment powers with respect to such account.

F3: Includes deferred dividend reinvestment shares acquired pursuant to 3M's Compensation Plan for Non-employee Directors.