POWER OF ATTORNEY

    The undersigned hereby authorizes and designates each of
J. D. Garraux, R. M. Stanton, C. D. Mallick, B. E. Lammel,
J. J. Moran, and J. A. Napoli (the "Attorneys") as his or her
fully authorized attorney for the purpose of signing and filing
on behalf of the undersigned all forms which are permitted or
required to be filed pursuant to Sction 16 of the Securities
Exchange Act of 1934 (the "Forms")concerning the undersigned's
interest in securities of United States Steel Corporation ("USS")
and/or the undersigned's status with respect to USS.  This
Power of Attorney authorizes each of the Attorneys to sign and
file the forms on behalf of the undersigned from the date hereof
until the undersigned ceases to be subject to Section 16 of the
Securities Exchange Act of 1934 by virtue of having been a
director or officer of USS.


                                 /s/ Robert J. Darnall
                                 _______________________

Date:  7-12-08