1
                                                                      Exhibit 24


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      -----------------
                                      /s/ T.J. Usher
   2


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      -----------------------
                                      /s/ Robert M. Hernandez

   3


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ---------------------
                                      /s/ Neil A. Armstrong

   4


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      -----------------
                                      /s/ V.G. Beghini
   5


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ---------------------
                                      /s/ Jeanette G. Brown

   6


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      -----------------
                                      /s/ C.A. Corry

   7


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ------------------
                                      /s/ Charles R. Lee
   8


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      -----------------
                                      /s/ Paul E. Lego
   9


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ----------------
                                      /s/ Ray Marshall
   10


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ------------------------
                                      /s/ John F. McGillicuddy
   11


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ----------------
                                      /s/ John Richman
   12


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ---------------------
                                      /s/ Seth E. Schofield
   13


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ----------------
                                      /s/ John Snow
   14


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      -------------------
                                      /s/ Paul J. Wilhelm
   15


                               POWER OF ATTORNEY
                               -----------------


         KNOW ALL MEN BY THESE PRESENTS:

         That the undersigned does hereby make, constitute and appoint Robert
M. Hernandez, Edward F. Guna, and Kenneth L. Matheny, or any one of them, my
true and lawful attorneys-in-fact to sign and execute for me and on my behalf
registration statements to be filed by USX Corporation ("USX") with the
Securities and Exchange Commission in connection with the modification of the
USX-U.S. Steel Group Common Stock Dividend Reinvestment and Stock Purchase Plan
and the USX-Marathon Group Common Stock Dividend Reinvestment and Stock
Purchase Plan, and any and all amendments to such registration statements to be
filed with the Securities and Exchange Commission pursuant to the Securities
Act of 1933, as amended, in such form as they or any one or more of them may
approve, and to do any and all other acts which said attorneys-in-fact may deem
necessary or desirable to enable USX Corporation to comply with said Act and
the rules and regulations thereunder.

         IN WITNESS WHEREOF, I have hereunto set my hand and seal this 26 day
of May, 1998.



                                      ----------------
                                      /s/ D.C. Yearley