EX-24: POWER OF ATTORNEY
Published on March 26, 2008
EXHIBIT 24
POWER OF ATTORNEY
(Re: Registration Statement on Form S-3)
(Re: Registration Statement on Form S-3)
     Each of the undersigned officers and directors of Huntington Bancshares Incorporated
(the Corporation) hereby appoints Richard A. Cheap, Thomas E. Hoaglin, and Donald R. Kimble as
his or her attorneys, and any of them, with power to act without the others, as his or her attorney
for so long as such individual remains an officer of the Corporation, to sign, in the name and on
behalf of the undersigned, and in any and all capacities stated below, and to cause to be filed
with the Securities and Exchange Commission (the Commission) under the Securities Act of 1933, as
amended (the Securities Act), the Corporations Post-Effective Amendment No. 2 to the automatic
shelf registration statement on Form S-3 (File No. 333-131143) (as amended by such Post-Effective
Amendment, the Registration Statement) pursuant to the resolutions of the Board of Directors of
the Corporation, and any and all exhibits thereto and further amendments to the Registration
Statement, (including any related registration statement which may be filed under Rule 462(b) of
the Securities Act), and any and all applications or other documents to be filed with, or submitted
to, the Commission pertaining thereto, hereby granting to such attorneys, and to each of them,
individually, full power and authority to do and perform in the name and on behalf of each of the
undersigned, and in any and all such capacities, every act and thing whatsoever necessary to be
done in and about the premises as fully as any of the undersigned could or might do in person,
hereby granting to each such attorney-in-fact full power of substitution and revocation and hereby
ratifying all that any such attorney-in-fact or his substitute may do by virtue hereof.
     In Witness Whereof, the undersigned have signed these presents as of the dates indicated next
to their respective signatures below.
| Signature: | Title: | Date: | ||
/s/ Thomas E. Hoaglin  | 
    February 20, 2008 | 
|||
  Thomas E. Hoaglin
  | 
    Chairman, President, Chief Executive Officer, and Director (Principal Executive Officer) | |||
/s/ Donald R. Kimble  | 
    February 20, 2008 | 
|||
  Donald R. Kimble
  | 
    Executive Vice President, Chief Financial Officer (Principal Financial Officer) | |||
/s/ Thomas P. Reed  | 
    February 20, 2008 | 
|||
  Thomas P. Reed
  | 
    Controller and Senior Vice President (Principal Accounting Officer) | |||
/s/ Raymond J. Biggs  | 
    February 20, 2008 | 
|||
  Raymond J. Biggs
  | 
    Director | 
| Signature: | Title: | Date: | ||
/s/ Don M. Casto III  | 
    February 20, 2008 | 
|||
  Don M. Casto III
  | 
    Director | |||
/s/ Michael J. Endres  | 
    February 20, 2008 | 
|||
  Michael J. Endres
  | 
    Director | |||
/s/ Marylouise Fennell, RSM  | 
    February 20, 2008 | 
|||
  Marylouise Fennell, RSM
  | 
    Director | |||
/s/ John B. Gerlach  | 
    February 20, 2008 | 
|||
  John B. Gerlach
  | 
    Director | |||
/s/ D. James Hilliker  | 
    February 20, 2008 | 
|||
  D. James Hilliker
  | 
    Director | |||
/s/ David P. Lauer  | 
    February 20, 2008 | 
|||
  David P. Lauer
  | 
    Director | |||
/s/ Wm. J. Lhota  | 
    February 20, 2008 | 
|||
  Wm. J. Lhota
  | 
    Director | |||
/s/ Jonathan A. Levy  | 
    February 20, 2008 | 
|||
  Jonathan A. Levy
  | 
    Director | |||
/s/ Gene E. Little  | 
    February 20, 2008 | 
|||
  Gene E. Little
  | 
    Director | |||
/s/ Gerard P. Mastroianni  | 
    February 20, 2008 | 
|||
  Gerard P. Mastroianni
  | 
    Director | |||
| Signature: | Title: | Date: | ||
/s/ David L. Porteous  | 
    February 20, 2008 | 
|||
  David L. Porteous
  | 
    Director | |||
/s/ Kathleen H. Ransier  | 
    February 20, 2008 | 
|||
  Kathleen H. Ransier
  | 
    Director |