EXHIBIT 24

DIRECTORS AND OFFICERS OF

FNB CORP.

REGISTRATION STATEMENT ON FORM S-4

POWER OF ATTORNEY

The undersigned directors and officer of FNB Corp. (the “Corporation”) hereby constitute and appoint Michael C. Miller, Jerry A. Little and Melanie S. Tuttle, and each of them, with full power of substitution and resubstitution, as attorneys or attorney of the undersigned, to execute and file under the Securities Act of 1933, as amended, a Registration Statement on Form S-4 with respect to the shares of Common Stock, par value $2.50 per share, of the Corporation to be delivered upon the acquisition of United Financial, Inc., and any and all amendments and exhibits thereto, including pre- and post-effective amendments, and any and all applications or other documents to be filed with the Securities and Exchange Commission pertaining to such registration, with full power and authority to do and perform any and all acts and things whatsoever necessary, appropriate or desirable to be done in the premises, all in the name, place and stead of the said directors and officers, hereby ratifying and approving the acts of said attorneys and any of them and any such substitute.

EXECUTED as of the 11th day of July, 2005.

/s/    MICHAEL C. MILLER         Michael C. Miller Chairman, President and Director (Chief Executive Officer)	/s/    JERRY A. LITTLE         Jerry A. Little Treasurer and Secretary (Chief Financial and Accounting Officer)
/s/    JAMES M. CAMPBELL, JR.         James M. Campbell, Jr. Director	/s/    R. LARRY CAMPBELL         R. Larry Campbell Director
/s/    DARRELL L. FRYE         Darrell L. Frye Director	/s/    WILBERT L. HANCOCK         Wilbert L. Hancock Director
/s/    THOMAS A. JORDAN         Thomas A. Jordan Director	/s/    DALE E. KEIGER         Dale E. Keiger Director
/s/    EUGENE B. MCLAURIN, II         Eugene B. McLaurin, II Director	/s/    R. REYNOLDS NEELY, JR.         R. Reynolds Neely, Jr. Director
/s/    RICHARD K. PUGH         Richard K. Pugh Director	/s/    J.M. RAMSAY III         J. M. Ramsay III Director