Exhibit 23. CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the prospectuses constituting part of the Registration Statements listed below of our reports dated February 10, 1998, relating to the Consolidated Financial Statements of USX Corporation, the Financial Statements of the Marathon Group and the Financial Statements of the U. S. Steel Group, appearing on pages U-1, M-1 and S-1, respectively, of this Form 10-K: On Form S-3: Relating to: File No. 33-34703 Marathon Group Dividend Reinvestment Plan 33-43719 U. S. Steel Group Dividend Reinvestment Plan 33-50191 USX Corporation Debt Securities, Preferred Stock and Common Stock 33-51621 USX Corporation Debt Securities, Preferred Stock and Common Stock 33-52937 USX Debt Securities 33-56659 Marathon Group Common Stock 33-57997 Marathon Group Dividend Reinvestment Plan 33-60142 USX Corporation Debt Securities 33-60172 U. S. Steel Group Dividend Reinvestment Plan On Form S-8: Relating to: File No. 33-6248 1986 Stock Option Plan 33-8669 Marathon Oil Company Thrift Plan 33-38025 1990 Stock Plan 33-41864 1990 Stock Plan 33-48116 Parity Investment Bonus 33-54333 Parity Investment Bonus 33-60667 Parity Investment Bonus 33-56828 Marathon Oil Company Thrift Plan 33-52917 Savings Fund Plan 333-00429 Savings Fund Plan 333-29699 1990 Stock Plan 333-29709 Marathon Oil Company Thrift Plan PRICE WATERHOUSE LLP 600 Grant Street Pittsburgh, PA 15219-2794 March 4, 1998