Exhibit 32-a

                     TRUSTMARK CORPORATION AND SUBSIDIARIES

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection  with the Quarterly  Report on Form 10-Q of Trustmark  Corporation
(Trustmark)  for the period ended June 30, 2005 as filed with the Securities and
Exchange  Commission  on the date hereof (the  Report),  I, Richard G.  Hickson,
Chairman  of the Board,  President  and Chief  Executive  Officer of  Trustmark,
certify,  pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1)   The Report fully complies with the  requirements  of Section 13(a) or 15(d)
     of the Securities Exchange Act of 1934; and

2)   The information  contained in the Report fairly  presents,  in all material
     respects, the financial condition and results of operations of Trustmark as
     of the dates and for the periods expressed in the Report.

BY:        /s/ Richard G. Hickson
           ----------------------
           Richard G. Hickson
           Chairman of the Board, President
           & Chief Executive Officer

DATE:      August 9, 2005