SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 11-K



(Mark One)
         [X]      ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE
                  SECURITIES EXCHANGE ACT OF 1934

                  For the fiscal year ended December 31, 2002


         [ ]      TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                  SECURITIES EXCHANGE ACT OF 1934

                  For the transition period from ________ to _______


Commission File Number 0-3683

Full title of the Plan and the address of the Plan,  if  different  from that of
the issuer named below:

                              Trustmark 401(k) Plan
                            (Full Title of the Plan)

Name of issuer of the  securities  held  pursuant to the Plan and the address of
its principal executive office:

                              Trustmark Corporation
                              248 E. Capitol Street
                           Jackson, Mississippi 39201
    (Name of Issuer of Securities and address of Principal Executive Office)





                              TRUSTMARK 401(K) PLAN

                        Financial Statements and Schedule

                           December 31, 2002 and 2001

                   (With Independent Auditors' Report Thereon)









                              TRUSTMARK 401(K) PLAN



                   Index to Financial Statements and Schedule



Independent Auditors' Report

Statements of Net Assets Available for Benefits as of December 31, 2002 and 2001

Statement of Changes in Net Assets Available for Benefits for the year ended
     December 31, 2002

Notes to Financial Statements

Supplemental Schedule:

Schedule H, Line 4i - Schedule of Assets (Held at End of Year) as of December
31, 2002

All other schedules are omitted because there is no information to report.








                          Independent Auditors' Report



The Plan Administrator
Trustmark 401(k) Plan:


We have audited the accompanying statements of net assets available for benefits
of Trustmark  401(k) Plan (the Plan) as of December  31, 2002 and 2001,  and the
related  statement of changes in net assets  available for benefits for the year
ended December 31, 2002. These financial  statements are the  responsibility  of
the  Plan's  management.  Our  responsibility  is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the  United  States of  America.  Those  standards  require  that we plan and
perform the audit to obtain  reasonable  assurance  about  whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the net assets available for benefits of the Plan as of
December 31, 2002 and 2001, and the changes in net assets available for benefits
for the year ended December 31, 2002 in conformity  with  accounting  principles
generally accepted in the United States of America.

Our audits  were  performed  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule of assets (held
at end of year) is not a required part of the basic financial  statements but is
supplementary  information  required  by the  Department  of  Labor's  Rules and
Regulations for Reporting and Disclosure  under the Employee  Retirement  Income
Security Act of 1974. The  supplemental  schedule is the  responsibility  of the
Plan's management.  The supplemental schedule has been subjected to the auditing
procedures  applied in the audit of the basic  financial  statements and, in our
opinion,  is fairly  stated in all  material  respects  in relation to the basic
financial statements taken as a whole.

                                   /s/ KPMG LLP


Jackson, Mississippi
June 6, 2003


                              TRUSTMARK 401(K) PLAN
                 Statements of Net Assets Available for Benefits
                           December 31, 2002 and 2001

                                                        2002            2001
                                                    ------------    ------------
Receivables:
   Sponsor contributions                            $    123,895    $  2,650,000
   Participant contributions                             193,956         124,809
                                                    ------------    ------------
            Total receivables                            317,851       2,774,809

Investments, at fair value:
   Money market accounts                              14,377,264       9,956,151
   Fixed income mutual funds                           6,094,106       4,747,472
   Common stock of Trustmark Corporation              53,648,075      62,084,423
   Equity mutual funds                                23,135,259      22,760,031
                                                    ------------    ------------

            Total investments                         97,254,704      99,548,077
                                                    ------------    ------------

            Net assets available for benefits       $ 97,572,555    $102,322,886
                                                    ============    ============


See accompanying notes to financial statements.



                              TRUSTMARK 401(K) PLAN
            Statement of Changes in Net Assets Available for Benefits
                          Year ended December 31, 2002

   Contributions:
      Sponsor                                                      $  2,870,482
      Participant                                                     4,935,396
                                                                   ------------
            Total contributions                                       7,805,878
                                                                   ------------
   Net investment loss:
      Net depreciation in fair value of investments                  (5,022,263)
      Interest income                                                   540,317
      Dividend income                                                 1,715,667
                                                                   ------------
            Net investment loss                                      (2,766,279)
                                                                   ------------
   Benefits paid to participants                                     (9,609,509)
   Administrative fees                                                 (180,421)
                                                                   ------------
            Net decrease in net assets available for benefits        (4,750,331)
Net assets available for benefits:
   Beginning of year                                                102,322,886
                                                                   ------------
   End of year                                                     $ 97,572,555
                                                                   ============

See accompanying notes to financial statements.


                              TRUSTMARK 401(K) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001



(1)    Plan Description

       The following  description  of Trustmark  401(k) Plan (the Plan) provides
       only general information. Participants should refer to the Plan agreement
       for a more complete description of the Plan's provisions.

       (a)    General

              The  Plan  is a  defined  contribution  plan  established  for the
              employees of Trustmark Corporation (the Company) and certain other
              associated   companies.   The  Plan   provides   eligibility   for
              participation  on  the  first  day  of  the  month  following  the
              completion  of  at  least  1,000  hours  of  service   during  the
              twelve-month  period  ending  on  the  anniversary  of a  person's
              employment commencement date.

       (b)    Plan Administration

              The Plan's record keeping functions are handled by Nationwide Life
              Insurance Company and Nationwide Trust Company. Trustmark National
              Bank  serves as the Plan's  trustee.  The plan  administrator  and
              sponsor is  Trustmark  Corporation,  parent  company of  Trustmark
              National Bank.  Prior to January 31, 2002, Bysis Plan Services and
              Frontier and Reliance  Trusts served as record keeper and trustee,
              respectively.

       (c)    Employee Contributions

              The Plan allows  participants to make voluntary  before-tax salary
              deferral contributions,  through payroll deductions, to separately
              invested  funds in accordance  with Section 401(k) of the Internal
              Revenue Code.  If certain  requirements  of Internal  Revenue Code
              Section 401(k) are not met in Plan operation,  the salary deferral
              agreements of participants may, on a nondiscriminatory and uniform
              basis,  be amended or revoked to preserve the qualified  status of
              the Plan.  Voluntary  after-tax  contributions by participants are
              not allowed. Participants may direct investment of their voluntary
              contributions among several investment options.

              Effective  January  1,  2002,  the  Plan  was  amended,   whereby,
              participants  may  elect  to  contribute  up to  25%  of  eligible
              compensation each period, subject to regulatory limitations. Prior
              to 2002,  employee  contributions  were limited to 15% of eligible
              compensation.  Any excess  contributions  must be  returned to the
              applicable  participant by April 15 of the calendar year following
              the year of  excess  contributions.  The Plan was  amended  in the
              current  year  whereby  rollover   contributions  from  individual
              retirement accounts or other qualified plans are allowed.

              In 2002, the Plan was amended whereby participants who were age 50
              years or  older  by the end of  calendar  year  were  able to make
              catch-up   contributions  to  the  Plan.  Catch-up   contributions
              represent employee compensation  deferrals in excess of IRS annual
              deferral  limits.  The  IRS  annual  deferral  limits  and  annual
              catch-up  contribution  limits  are  indicated  in  the  following
              schedule:

                                                                  Catch-up
              Calendar year         Deferral limit           contribution limit
              -------------         ---------------          ------------------
                  2002                  $11,000                    $1,000
                  2003                   12,000                     2,000
                  2004                   13,000                     3,000
                  2005                   14,000                     4,000
                  2006                   15,000                     5,000
               Thereafter           Indexed in $500           Indexed in $500
                                      increments                increments


                              TRUSTMARK 401(K) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001


       (d)    Employer Contributions

              Effective  January  1,  2002,  the Plan was  amended  whereby  all
              employee  contributions  are matched by the  employer at a rate of
              100%  of  the  first  3%  and  50%  of  the  next  3%  of  covered
              compensation.  Prior to January 1,  2002,  employee  contributions
              were  not  matched  by  the  employer.   The  Company  contributed
              $2,870,482 and $2,671,871 to the Plan in 2002 and 2001.  Under the
              amended   provisions   of  the  Plan,   the   employer   may  make
              discretionary contributions.

       (e)    Allocations

              Employee and employer contributions are allocated directly to each
              participant's   account   in   accordance   with  the   individual
              participant's elections.  Participant accounts are valued daily.

       (f)    Vesting

              On the first  day of the  month  coincident  with or  following  a
              participant's  sixty-fifth birthday,  such participant is entitled
              to retire from active  service with the employer,  and 100% of the
              value of the participant's share of the Plan becomes fully vested.
              A  participant  also  vests  100%  upon  death or  termination  of
              employment due to permanent disability.

              Participants   are   immediately   vested   in   their   voluntary
              contributions   and  employer   matching   contributions  and  the
              investment  earnings and losses thereon.  Participants vest in the
              employer  discretionary  contributions  as shown in the  following
              schedule:

                        Years vesting service       Vested percentage
                        ---------------------       -----------------
                             Less than 5                   0%
                              5 or more                  100%

              Forfeitures of nonvested employer  discretionary accounts are used
              to reduce the employer match contribution.

              In  case  of   termination   of  the  Plan,   the  value  of  each
              participant's  share of the Plan  becomes  fully  vested as of the
              date of such termination.

       (g)    Payment of Benefits

              On retirement,  death,  disability,  or termination of service,  a
              participant may elect to receive a lump-sum  distribution equal to
              his or her vested account balance or a life annuity.  In addition,
              hardship distributions are permitted if certain criteria are met.

       (h)    Plan Termination

              Although it has not expressed any intent to do so, the Company has
              the right under the Plan to discontinue its  contributions  at any
              time and to terminate the Plan subject to the provisions of ERISA.
              However, no such action may deprive any participant or beneficiary
              under the Plan of any vested benefit.

(2)    Significant Accounting Policies

       (a)    Basis of Presentation

              The Plan's  financial  statements  are prepared  using the accrual
              basis  of  accounting,  with  the  exception  of  the  payment  of
              benefits,  which are  recognized  as a reduction in the net assets
              available  for  benefits  of the  Plan as they  are  disbursed  to
              participants.  Purchases and sales of securities are recorded on a
              trade-date basis.


                              TRUSTMARK 401(K) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001



       (b)    Use of Estimates

              The  preparation  of  financial   statements  in  conformity  with
              accounting  principles  generally accepted in the United States of
              America requires management to make estimates and assumptions that
              affect the reported amounts of net assets and changes therein, and
              disclosure of contingent  assets and  liabilities.  Actual results
              could differ from those estimates.

       (c)    Valuation of Investments

              Investments are stated at fair value.  Cash equivalents are stated
              at cost which  approximates  fair value.  The fair value of mutual
              funds  and  other  securities  traded  on  a  national  securities
              exchange are valued at the closing quoted market price on the last
              business day of the year.

       (d)    Net Depreciation in Fair Value of Investments

              Net depreciation in fair value of investments,  as recorded in the
              accompanying  statement  of changes in net  assets  available  for
              benefits,  includes changes in fair value of investments acquired,
              sold, or held during the year.

       (e)    Administrative Fees

              Administrative  fees  are  paid  by  the  Plan.  All  other  fees,
              including professional fees, are paid by the Company.

(3)    Investments

       The fair value of individual investments that represent 5% or more of the
       Plan's net assets as of December 31, 2002 and 2001 are as follows:



                                                                                  December 31,
                                                                          --------------------------
                                                                             2002           2001
                                                                          -----------    -----------
       Investments at fair value as determined by quoted market price:
                                                                                   
          Common stock of Trustmark Corporation                           $53,648,075    $62,084,423
          Performance Funds Trust Mutual Funds:
            Large-Cap Equity Fund                                           6,047,890     10,571,905
            Mid-Cap Equity Fund                                             5,484,933      7,555,686
          Federated Capital Preservation Fund                              13,768,069      9,729,922



       During 2002, the Plan's  investments  (including  investments  bought and
       sold, as well as held during the year) appreciated (depreciated) in value
       as follows:

       Investments at fair value as determined by quoted market price:
          Trustmark Corporation Stock Fund                          $ 1,419,642
          Mutual Funds                                               (6,441,905)
                                                                    -----------
             Net depreciation in fair value of investments          $(5,022,263)
                                                                    ===========


(4)    Income Tax Status

       The Internal Revenue Service has determined and informed the Company by a
       letter dated June 1, 1998,  that the Plan and related  trust are designed
       in  accordance  with  applicable  sections of the  Internal  Revenue Code
       (IRC).  The Plan has  been  amended  since  receiving  the  determination
       letter.  However,  the plan  administrator  and the  Plan's  tax  counsel
       believe  that the Plan is designed  and is  currently  being  operated in
       compliance with the applicable requirements of the IRC.


                              TRUSTMARK 401(K) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001



(5)    Related Parties

       Trustmark  National  Bank  serves  as  the  investment  advisor  for  the
       Performance Funds Trust Mutual Funds. Trustmark Corporation is the parent
       company of Trustmark  National Bank.  Trustmark National Bank also serves
       as the Plan's trustee.


(6)    Reconciliation of Financial Statements to Form 5500

       The following is a  reconciliation  of benefits paid to participants  per
       the  accompanying  financial  statements to the Form 5500 as filed by the
       Company for the year ended December 31, 2002:
                                                                      Benefits
                                                                        paid
                                                                     ----------
       Per accompanying financial statements                         $9,609,509
       2001 amounts pending distribution to participants                (72,000)
       2002 amounts pending distribution to participants                      -
                                                                     ----------
                 Per Form 5500                                       $9,537,509
                                                                     ==========

       The  following  table is a  reconciliation  of  benefits  payable and net
       assets available for benefits per the accompanying  financial  statements
       to the Form 5500 as filed by the Company for the year ended  December 31,
       2001:
                                                                   Net assets
                                                       Benefit    available for
                                                       payable    plan benefits
                                                       --------   -------------
       Per accompanying financial statements           $      -   $ 102,322,886
       2001 amounts pending distribution to
          participants                                   72,000         (72,000)
                                                       --------   -------------
                 Per Form 5500                         $ 72,000   $ 102,250,886
                                                       ========   =============


(7)    Contingencies

       The Company and its subsidiaries are parties to lawsuits and other claims
       that  arise in the  ordinary  course of  business.  Some of the  lawsuits
       assert claims  related to various  business  activities;  and some of the
       lawsuits  allege  substantial  claims  for  damages.  The cases are being
       vigorously  contested.  In the  regular  course of  business,  management
       evaluates estimated losses or costs related to litigation,  and provision
       is made for  anticipated  losses whenever  management  believes that such
       losses are probable and can be reasonably estimated. At the present time,
       management believes, based on the advice of legal counsel, that the final
       resolution of pending legal  proceedings  will not have a material impact
       on the financial  position or results of operations of either the Company
       or the Plan.


                              TRUSTMARK 401(K) PLAN
                       Plan Sponsor: Trustmark Corporation
                          Plan Sponsor: EIN 64-0471500
                                Plan Number: 002
         Schedule H, Line 4i - Schedule of Assets (Held at End of Year)
                               December 31, 2002

                                                                       Current
    Identity of issuer                    Description                   value
---------------------------  --------------------------------------  -----------
 Money market account:
    Federated                Capital Preservation Fund               $13,768,069
    Gartmore                 Money Market Inst'l Fund                    609,195
                                                                     -----------
                                                                      14,377,264
                                                                     -----------
 Fixed income mutual funds:
*   Performance Funds Trust  Short Term Govt. Inst. Fund               2,509,420
*   Performance Funds Trust  Intermediate Term Govt. Inst. Fund        2,382,564
    Dreyfus                  GNMA Fund                                   546,169
    PIMCO                    Total Return Fund                           655,953
                                                                     -----------
                                                                       6,094,106
                                                                     -----------
 Common stock fund:
*   Trustmark Corporation    Common Stock Fund                        53,648,075
                                                                     -----------
 Equity mutual funds:
*   Performance Funds Trust  Leader's Equity Fund                        314,819
*   Performance Funds Trust  Large-Cap Equity Fund                     6,047,890
*   Performance Funds Trust  Mid-Cap Equity Fund                       5,484,933
    Dreyfus                  Mid-Cap Value Fund                        1,284,770
    Franklin                 Balance Sheet Investment Fund             1,271,616
    Franklin                 Mutual Discovery Fund                       415,623
    Gartmore                 Inv. Destinations Aggr. Svc. Fund            95,369
    Gartmore                 Inv. Destinations Cons. Svc. Fund            61,344
    Gartmore                 Inv. Destinations Mod. Svc. Fund            174,943
    Gartmore                 Inv. Destinations Mod. Aggr. Svc. Fund      245,923
    Gartmore                 Inv. Destinations Mod. Cons. Svc. Fund       75,711
    Goldman Sachs            CORE Small Cap. Equity Fund               2,126,435
    INVESCO                  Dynamics Inv. Fund                          191,478
    Neuberger                Neuberger Berman Genesis Trust            1,215,309
    Oppenheimer              Global Fund                                 353,952
    Van Kampen               Equity & Income Fund                      1,670,395
    Van Kampen               Emerging Growth Fund                      1,024,942
    Templeton                Foreign Fund                              1,079,807
                                                                     -----------
                                                                      23,135,259
                                                                     -----------
                                                                     $97,254,704
                                                                     ===========
* Denotes related party based on the following relationships:
        Trustmark  National  Bank serves as investment  advisor for  Performance
        Funds Trusts;  Trustmark  Corporation is the parent company of Trustmark
        National Bank.

See accompanying independent auditors' report.




Pursuant  to  the   requirements  of  the  Securities  Act  of  1934,  the  Plan
Administrator  has duly caused this Annual  Report to be signed on its behalf by
the undersigned thereunto duly authorized.

                                    Trustmark 401(k) Plan
                                    Trustmark Corporation, Plan Administrator

                                    By: /s/ Louis E. Greer
                                        ------------------
                                        Louis E. Greer
                                        Chief Accounting Officer

                                    June 30, 2003