Exhibit 24

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ J. Gary Cooper  

J. Gary Cooper 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Robert J. Darnall  

Robert J. Darnall 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ John G. Drosdick  

John G. Drosdick 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Richard A. Gephardt  

Richard A. Gephardt 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Dr. Shirley Ann Jackson  

Dr. Shirley Ann Jackson 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Charles R. Lee  

Charles R. Lee 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Frank J. Lucchino  

Frank J. Lucchino 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Dan D. Sandman  

Dan D. Sandman 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Seth E. Schofield  

Seth E. Schofield 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ John P. Surma, Jr.  

John P. Surma, Jr. 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Thomas J. Usher  

Thomas J. Usher 

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty and Larry G. Schultz, or any one of them, my true and lawful attorneys-in-fact, each with the power of substitution and resubstitution, to sign, execute and file for me and on my behalf a registration statement registering up to 6,750,000 shares of United States Steel Corporation common stock to be issued in connection with the 2005 Stock Incentive Plan, on forms prescribed by the Securities and Exchange Commission (collectively, “Registration Statements”), and any and all amendments to the Registration Statements or further 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 United States Steel Corporation to comply with said Act and the rules and regulations promulgated thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of April, 2005.

/s/ Douglas C. Yearley  

Douglas C. Yearley