Exhibit 21
The following is a list of U. S. Steel’s subsidiaries at December 31, 2003.
| Subsidiary |
State or Country of Incorporation | |
| Adela Investment Company S.A. |
Luxembourg | |
| Chrome Deposit Corporation |
Indiana | |
| Clairton 1314B Partnership, L.P. |
Delaware | |
| Compagnie de Gestion de Mifergui-Nimba, LTEE. |
Delaware | |
| Cygnus Mines Limited |
Canada | |
| Delaware ÁñÁ«ÊÓƵ Corporation |
Delaware | |
| Delray Connecting Railroad |
Michigan | |
| Double Eagle Steel Coating Company |
Michigan | |
| Double G Coatings, Inc. |
Delaware | |
| Double G Coatings Company, L.P. |
Delaware | |
| Essex Minerals Company (Societe des Mineraux Essex) |
New Jersey | |
| Farms Sewer Company, Inc. |
New York | |
| Farms Water Company, Inc. |
New York | |
| Feralloy Processing Co. |
Indiana | |
| Grant Assurance Corporation |
Vermont | |
| La Pointe Iron Company |
Wisconsin | |
| New Deal Development, Inc. |
Delaware | |
| New King Court Development Associates, LLC |
Michigan | |
| Oilfield Technologies, Inc. |
Delaware | |
| Olympic Laser Processing |
Michigan | |
| Orinoco Mining Company |
Delaware | |
| Pasadena Yacht and Country Club, Inc. |
Delaware | |
| Perdido Land Development Co., Inc. |
Delaware | |
| Phil Prop, Inc. |
Delaware | |
| PITCAL, Inc. |
Delaware | |
| ÁñÁ«ÊÓƵ-POSCO Industries |
California | |
| ProCoil Company, LLC |
Delaware | |
| Smart Screen Systems, Inc. |
Minnesota | |
| Societe Des mines de Fer de Guinee Pour L’Exploitation Des Monts Nimba (Mifergui Nimba) |
Guinea | |
| Straightline Source, Inc. |
Delaware | |
| Straightline, Inc. |
Delaware | |
| Swan Point Yacht & Country Club, Inc. |
Delaware |
| Tilden Iron Mining Company |
West Virginia | |
| Transtar, Inc. |
Delaware | |
| Birmingham Southern Railroad Company |
Alabama | |
| Elgin, Joliet and Eastern Railway Company |
Delaware | |
| Fairfield Southern Company, Inc. |
Delaware | |
| Lake Terminal Railroad Company, The |
Delaware | |
| McKeesport Connecting Railroad Company |
Delaware | |
| Tracks Traffic and Management Services, Inc. |
Delaware | |
| Union Railroad Company |
Delaware | |
| Warrior & Gulf Navigation Company |
Delaware | |
| Mobile River Terminal Company |
Alabama | |
| Sisco Stevedoring, LLC |
Alabama | |
| The Southern International Services Company, Inc. |
Alabama | |
| The Southern International Services Company II, Inc. |
Alabama | |
| Transtar Logistics, LLC |
Delaware | |
| EX-IM Logistics, LLC |
Delaware | |
| U.S. Steel International of Canada, LTD. |
Delaware | |
| U.S. Steel Mining Company, LLC |
Alabama | |
| ÁñÁ«ÊÓƵ Mine Management, Inc. |
Alabama | |
| United States Steel International, Inc. |
New Jersey | |
| Compania de Representaciones Mercantiles, Cubacero, S.A. |
Cuba | |
| United States Steel Export Company de Mexico, S.R.L. de C.V. |
Mexico | |
| Acero Prime, S.R.L. de C.V. |
Mexico | |
| United States Steel International de Mexico, S.R.L. de C.V. |
Mexico | |
| U. S. Steel Receivables, LLC |
Delaware | |
| U. S. Steel Timber Company, LLC |
Alabama | |
| ÁñÁ«ÊÓƵ Coal Sales, LLC |
Delaware | |
| ÁñÁ«ÊÓƵ Galvanizing, Inc. |
Delaware | |
| PRO-TEC Coating Company |
Ohio | |
| PRO-TEC Coating Company, Inc. |
Ohio | |
| ÁñÁ«ÊÓƵ International Services, LLC |
Delaware | |
| ÁñÁ«ÊÓƵ Oilwell Supply Co., LTD. |
Delaware | |
| ÁñÁ«ÊÓƵ Oilwell Tubular, Inc. |
Delaware | |
| ÁñÁ«ÊÓƵ Portfolio Delaware, Inc. |
Delaware | |
| ÁñÁ«ÊÓƵ Tubular Processing, Inc. |
Delaware | |
| U. S. Steel Holdings, Inc. |
Delaware | |
| ÁñÁ«ÊÓƵ Global Holdings I, B.V. |
Netherlands | |
| U. S. Steel Kosice (ÁñÁ«ÊÓƵK) |
Slovakia | |
| Elektroservis VN a VVN a.s. Kosice |
Slovakia |
| Energoservis a.s. Kosice |
Slovakia | |
| Hutnictvi zeleza (Czech Republic) |
Czech Republic | |
| International Trade Center a.s. |
Slovakia | |
| NV Promet SA (Belgium) |
Belgium | |
| SZ Stahl GmbH (Germany) |
Germany | |
| Waltzwerke Finow GmbH |
Germany | |
| Betrieber Gesellschaft Nordbahn GmbH |
Germany | |
| Stawa Stahlbau GmbH |
Germany | |
| Vozmult a.s. Kosice |
Slovakia | |
| VSZ (U.K.) Ltd. (United Kingdom) |
United Kingdom | |
| Vulkmont a.s. Kosice |
Slovakia | |
| U. S. Steel Global Holdings II, B.V. |
Netherlands | |
| U. S. Steel Serbia, B.V. |
Netherlands | |
| Sartid, a.d. |
Serbia | |
| Sartid Beli Limovi, a.d. |
Serbia | |
| Luka Smedervo d.o.o. |
Serbia | |
| Veljko Dugosevic d.o.o. Kucevo |
Serbia | |
| Spin d.o.o. |
Serbia | |
| Slobodna Zona Smederevo |
Serbia | |
| Stara Zelezara d.o.o. Smederevo |
Serbia | |
| U. S. Steel Balkan, d.o.o. |
Serbia | |
| U. S. Steel Holdings III, Inc. |
Delaware | |
| U. S. Steel Poland, B.V. |
Netherlands | |
| U. S. Steel Europe, B.V. |
Netherlands | |
| USX Credit Corp. – California |
Delaware | |
| UEC Technologies, LLC |
Pennsylvania | |
| Met-Chem Canada Inc. |
Canada | |
| UEC Sail Information Technology, LTD. |
India | |
| USX Engineers and Consultants, Inc. |
Delaware | |
| USX International Sales Company, Inc. |
Barbados | |
| USX Participacoes LTDA. |
Brazil | |
| Merinds Mineracao |
Brazil | |
| Mineracao Carajas, LTDA. |
Brazil | |
| Mineracao Maraba, LTDA. |
Brazil | |
| USX RTI Holdings, Inc. |
Delaware | |
| Republic Technologies International Holdings LLC |
Delaware | |
| Republic Technologies International LLC |
Delaware | |
| Worthington Specialty Processing |
Missouri |