EXHIBIT 21 MINNESOTA MINING AND MANUFACTURING COMPANY AND CONSOLIDATED SUBSIDIARIES PARENT AND SUBSIDIARIES

Percentage of Organized Voting Securities Under Beneficially Owned Name of Company Laws of by Registrant Registrant: Minnesota Mining and Manufacturing Company Delaware Consolidated subsidiaries of the registrant: Dyneon L.L.C. Delaware 54 Eastern Heights Bank Minnesota 99 3M Unitek Corporation California 100 3M Argentina S.A.C.I.F.I.A. Argentina 100 3M Australia Pty. Limited Australia 100 3M Oesterreich GmbH Austria 100 3M Belgium S.A./N.V. Belgium 100 Seaside Insurance Limited Bermuda 100 3M do Brasil Limitada Brazil 100 3M Canada Inc. Canada 100 3M A/S Denmark 100 Suomen 3M Oy Finland 100 3M France, S.A. France 100 3M Deutschland GmbH Germany 100 3M Hong Kong Limited Hong Kong 100 3M Italia Finanziaria S.p.A. Italy 100 Sumitomo 3M Limited Japan 50 3M Health Care Limited Japan 75 3M Korea Limited Korea 100 3M Mexico, S.A. de C.V. Mexico 100 Corporate Services B.V. Netherlands 100 3M Nederland B.V. Netherlands 100 3M (New Zealand) Limited New Zealand 100 3M Norge A/S Norway 100 3M Puerto Rico, Inc. Puerto Rico 100 3M Singapore Private Limited Singapore 100 3M South Africa (Proprietary) Limited South Africa 100 3M Espana, S.A. Spain 100 3M Svenska AB Sweden 100 3M (East) A.G. Switzerland 100 3M (Schweiz) A.G. Switzerland 100 3M Taiwan Limited Taiwan 100 3M Thailand Limited Thailand 100 3M United Kingdom Holdings P.L.C. United Kingdom 100 3M Venezuela, S.A. Venezuela 100 NOTE: Subsidiary companies excluded from the above listing, if considered in the aggregate, would not constitute a significant subsidiary.