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EXHIBIT 21. LIST OF SIGNIFICANT SUBSIDIARIES
The following subsidiaries were 100 percent owned and were consolidated by
the Corporation at December 31, 1993:
STATE OR OTHER JURISDICTION
NAME OF SUBSIDIARY IN WHICH INCORPORATED
-------------------------------------------- -----------------------------------
Carnegie Natural Gas Company Pennsylvania
Delhi Gas Pipeline Corporation Delaware
Emro Marketing Company Delaware
Marathon Exploration Tunisia, Ltd. Delaware
Marathon International Oil Company Delaware
Marathon Oil Company Ohio
Marathon Oil U.K., Ltd. Delaware
Marathon Petroleum Cayman I, Ltd. Delaware
Marathon Petroleum Company (Norway) Delaware
Marathon Petroleum Egypt, Ltd. Delaware
Marathon Petroleum Grombalia, Ltd. Delaware
Marathon Petroleum Indonesia, Ltd. Delaware
Marathon Petroleum Ireland, Ltd. Delaware
Marathon Petroleum Netherlands, Ltd. Delaware
Marathon Petroleum Syria, Ltd. Delaware
Marathon Petroleum Tunisia, Ltd. Delaware
Marathon Pipe Line Company Delaware
Pan Ocean Oil Corporation (Indonesia) Delaware
United States Steel International, Inc. New Jersey
U. S. Steel Mining Co., Inc. Delaware
USX Portfolio Delaware, Inc. Delaware
USX Engineers and Consultants, Inc. Delaware
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EXHIBIT 21. (CONTD.)
The following companies or joint ventures were not consolidated at December
31, 1993:
COMPANY COUNTRY % OWNERSHIP ACTIVITY
------- ------- ----------- --------
CLAM Petroleum Company Netherlands 50% Oil & Gas Production
Double Eagle Steel Coating Company United States 50% Steel Processing
Laredo-Nueces Pipeline Company United States 50% Natural Gas Transmission
National-Oilwell United States 50% Oilwell Equipment, Supplies
PRO-TEC Coating Company United States 50% Steel Processing
USS/Kobe Steel Company United States 50% Steel Products
USS-POSCO Industries United States 50% Steel Processing
Worthington Specialty Processing United States 50% Steel Processing
Transtar, Inc. United States 45% Transportation
LOCAP INC. United States 37% Pipeline & Storage Facilities
LOOP INC. United States 32% Offshore Oil Port
Kenai LNG Corporation United States 30% Natural Gas Liquification
Ozark Gas Transmission System United States 25% Natural Gas Transmission
The names of other subsidiaries, both consolidated and unconsolidated, have
been omitted as these unnamed subsidiaries, considered in the aggregate as a
single subsidiary, do not constitute a significant subsidiary.