EXHIBIT 21 SUBSIDIARIES The companies listed below are the primary subsidiaries of the Corporation. The financial data for these subsidiaries, as well as for other subsidiaries which are not considered to be significant and are therefore excluded from this exhibit, comprised the Corporation's consolidated financial statements. Organized Under Name of Company Laws of Domestic: United States Gypsum Company(a)......................................................... Delaware USG Interiors, Inc. (a)................................................................. Delaware L&W Supply Corporation (a)(b)........................................................... Delaware USG International, Ltd.................................................................. Delaware USG Foreign Investments, Ltd. (a)....................................................... Delaware USG Interiors International, Inc........................................................ Ohio USG Funding Corporation................................................................. Delaware La Mirada Products Co., Inc............................................................. Ohio USG Foreign Sales Corporation........................................................... Virgin Islands Gypsum Engineering Company.............................................................. Delaware Alabaster Assurance Company, Ltd........................................................ Vermont International: CGC Inc. (a)............................................................................ Canada USG Canadian Mining Ltd................................................................. Ontario Gypsum Transportation Limited........................................................... Bermuda Yeso Panamericano, S.A. de C.V.......................................................... Mexico USG Manufacturing Worldwide, Ltd........................................................ Caymans Panama Gypsum Company................................................................... Panama USG Interiors (Donn) S.A................................................................ Belgium Donn Products GmbH...................................................................... Germany USG Interiors Eastern Manufacturing GmbH................................................ Germany USG Interiors East Sales GmbH........................................................... Germany USG (U.K.) Ltd.......................................................................... United Kingdom USG France S.A.......................................................................... France USG (Netherlands) B.V................................................................... Netherlands USG Interiors (Europe) S.A.............................................................. Belgium USG Interiors Coordination Centre S.A................................................... Belgium USG Belgium Holdings S.A................................................................ Belgium USG Asia Pacific Holdings Pty. Ltd...................................................... Singapore USG Interiors Pacific Ltd............................................................... New Zealand USG Interiors Australia Pty. Ltd....................................................... Australia USG Interiors (Far East) SDN BHD........................................................ Malaysia Alabaster Engineering (Nederland) B.V................................................... Netherlands Red Top Technology (Nederland) B.V...................................................... Netherlands (a) Accounts for material revenues. (b) As of December 31, 1996, L&W Supply conducted its business out of 161 locations in 34 states using various names registered under applicable assumed business name statutes.