Exhibit 21

                              LIST OF SUBSIDIARIES

The  following  is a list of all  subsidiaries  of  Trustmark as of December 31,
2003, and the  jurisdiction  in which each was organized.  Each  subsidiary does
business under its own name.

Name                                       Jurisdiction Where Organized
---------------------------------------    ----------------------------
Trustmark National Bank                              Mississippi
F. S. Corporation                                    Mississippi
First Building Corporation                           Mississippi
Somerville Bank & Trust Company                      Tennessee
Trustmark Securities, Inc. (1)                       Mississippi
The Bottrell Insurance Agency, Inc. (1)              Mississippi
Trustmark Investment Advisors, Inc. (1)              Mississippi

    (1) Subsidiary of Trustmark National Bank.