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, 2004

[ ]      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

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



                              TRUSTMARK 401(K) PLAN

                        Financial Statements and Schedule

                           December 31, 2004 and 2003

        (Report of Independent Registered Public Accounting Firm Thereon)



                              TRUSTMARK 401(K) PLAN


                   Index to Financial Statements and Schedule


Report of Independent Registered Public Accounting Firm

Statements of Net Assets Available for Benefits as of December 31, 2004 and 2003

Statement of Changes in Net Assets Available for Benefits for the year ended
     December 31, 2004 and 2003

Notes to Financial Statements

Supplemental Schedule:

Schedule H, Line 4i - Schedule of Assets (Held at End of Year) as of December
31, 2004


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



             Report of Independent Registered Public Accounting Firm


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, 2004 and 2003,  and the
related statements of changes in net assets available for benefits for the years
then ended.  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 the standards of the Public  Company
Accounting Oversight Board (United States). 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, 2004 and 2003, and the changes in net assets available for benefits
for the years then ended 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 2004 financial  statements and, in
our opinion,  is fairly stated in all material respects in relation to the basic
2004 financial statements taken as a whole.

                                        /s/ KPMG LLP


Jackson, Mississippi
June 10, 2005



                              TRUSTMARK 401(K) PLAN
                 Statements of Net Assets Available for Benefits
                           December 31, 2004 and 2003

                                                       2004            2003
                                                   ------------    ------------
Investments, at fair value:
   Money market accounts                           $ 16,972,820    $ 14,944,873
   Fixed income mutual funds                          4,818,765       4,989,877
   Common stock of Trustmark Corporation             56,205,226      55,284,620
   Equity mutual funds                               45,796,548      34,381,716
                                                   ------------    ------------
      Total investments                             123,793,359     109,601,086
                                                   ------------    ------------
Receivables:
   Employer contributions                               172,635         231,240
   Participants' contributions                          196,834         191,042
   Investment proceeds                                        -         240,014
                                                   ------------    ------------
      Total receivables                                 369,469         662,296
                                                   ------------    ------------
      Net assets available for benefits            $124,162,828    $110,263,382
                                                   ============    ============

See accompanying notes to financial statements.



                              TRUSTMARK 401(K) PLAN
           Statements of Changes in Net Assets Available for Benefits
                     Years ended December 31, 2004 and 2003

                                                       2004            2003
                                                   ------------    ------------
Contributions:
   Employer                                        $  2,966,908    $  3,178,679
   Participants'                                      6,192,908       5,138,254
   Other                                                264,914               -
                                                   ------------    ------------
      Total contributions                             9,424,730       8,316,933
                                                   ------------    ------------
Net investment income:
   Net appreciation in fair value of investments      6,230,651      17,159,125
   Interest and dividends                             4,748,325       2,974,985
                                                   ------------    ------------
      Net investment income                          10,978,976      20,134,110
                                                   ------------    ------------
Benefits paid to participants                        (6,378,715)    (15,592,475)
Administrative fees                                    (125,545)       (167,741)
                                                   ------------    ------------
      Net increase in net assets available
        for benefits                                 13,899,446      12,690,827

Net assets available for benefits:
      Beginning of year                             110,263,382      97,572,555
                                                   ------------    ------------
      End of year                                  $124,162,828    $110,263,382
                                                   ============    ============

See accompanying notes to financial statements.



                              TRUSTMARK 401(K) PLAN
                          Notes to Financial Statements
                           December 31, 2004 and 2003


(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 associates
          of Trustmark  Corporation  (the Company) and certain other  associated
          companies.

     (b)  Eligibility

          Effective January 1, 2004, the Plan was amended to provide eligibility
          for participation in elective  deferrals by employees on the first day
          of the month after thirty days of employment.  Prior to 2004, the Plan
          provided  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.

     (c)  Plan Administration

          The  Plan's  record  keeping  and  trustee  functions  are  handled by
          Nationwide Life Insurance  Company and Nationwide  Trust Company.  The
          plan  administrator  and  sponsor  is  Trustmark  Corporation,  parent
          company of Trustmark National Bank.

     (d)  Participants' 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.

          Participants   may  elect  to   contribute   up  to  25%  of  eligible
          compensation  each  period,  subject to  regulatory  limitations.  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  allows  for  rollover  contributions  from
          individual retirement accounts or other qualified plans.

          Provisions  of the Plan  allow  participants  who were age 50 years or
          older by the end of calendar  year to make catch-up  contributions  to
          the Plan.  Catch-up  contributions  represent  associate  compensation
          deferrals  in excess of  certain  plan  limits  and  statutory  limits
          including IRS annual deferral  limits.  The IRS annual deferral limits
          and annual catch-up contribution limits for future years are indicated
          in the following schedule:

                                                                   Catch-up
          Calendar year            Deferral limit             contribution limit
          -------------            --------------             ------------------
              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



     (e)  Employer Contributions

          Eligible  participant  contributions  are matched by the employer at a
          rate of  100%  of the  first  3% and  50% of the  next  3% of  covered
          compensation. The employer may also make discretionary contributions.

     (f)  Allocations

          Participant and employer  contributions are allocated directly to each
          participant's account in accordance with the individual  participant's
          elections.  Forfeitures of nonvested employer  discretionary  accounts
          were used to reduce the employer match  contribution  (see note 1(g)).
          During  2003,  the Plan  utilized  $134,678 in  forfeitures  to reduce
          employer contributions.

     (g)  Vesting

          Participants are immediately  vested in their voluntary  contributions
          and the investment earnings and losses thereon.

          Effective  January 1, 2004,  participants  became  100%  vested in all
          employer   contributions   made  on  their  behalf,   including  those
          non-vested contributions remaining in the Plan on January 1, 2004.

          Prior to January 1, 2004, as of the day of a participant's sixty-fifth
          birthday,  such participant was entitled to retire from active service
          with the employer, and 100% of the value of the participant's share of
          the Plan became  fully  vested.  A  participant  also vested 100% upon
          death or termination of employment due to permanent disability.

          Prior  to  January  1,  2004,  participants  vested  in  the  employer
          discretionary  contributions and allocated  earnings or losses thereon
          as shown in the following schedule:

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

          In case of termination of the Plan, each participant's  account became
          fully vested as of the date of such termination.

     (h)  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  account  balance or in  installments.  In  addition,  hardship
          distributions are permitted if certain criteria are met.

     (i)  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.  Dividends  are
          recorded on the ex-dividend date.



     (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.  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 Appreciation in Fair Value of Investments

          Net  appreciation  in fair value of  investments,  as  recorded in the
          accompanying   statement  of  changes  in  net  assets  available  for
          benefits,  includes changes in the 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, 2004 and 2003 are as follows:

                                                            December 31,
                                                    ----------------------------
                                                        2004             2003
                                                    -----------      -----------
     Investments at fair value as determined
       by quoted market price:
        Common stock of Trustmark Corporation       $56,205,226      $55,284,620
        Performance Funds Trust Mutual Funds:
           Large-Cap Equity Fund                      7,872,865        7,120,723
           Mid-Cap Equity Fund                        8,500,519        7,402,858
     Investments at cost, which approximates
       fair value:
        Federated Capital Preservation Fund          14,296,460       13,027,583

     During 2004 and 2003, the Plan's investments  (including investments bought
     and sold, as well as held during the year) appreciated in value as follows:

                                                            December 31,
                                                    ----------------------------
                                                        2004             2003
                                                    -----------      -----------
     Investments at fair value as determined
       by quoted market price:
        Common stock of Trustmark Corporation       $ 3,331,570      $10,791,486
        Mutual funds                                  2,899,081        6,367,639
                                                    -----------      -----------
          Net appreciation in fair value
            of investments                          $ 6,230,651      $17,159,125
                                                    ===========      ===========

     Effective  January 1, 2004, the Plan provides  participants the opportunity
     to annually  elect whether cash  dividends  paid on employer  stock will be
     invested in shares of employer  stock within the  individual  participant's
     account or be paid to the participant in cash.

(4)  Income Tax Status

     The Internal  Revenue  Service has determined and informed the Company by a
     letter  dated  November  19,  2001,  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.




(5)  Related Parties

     Trustmark   National  Bank  serves  as  the  investment   advisor  for  the
     Performance Funds Trust Mutual Funds. For the years ended December 31, 2004
     and 2003,  dividends of $1,418,868 and $1,347,219 were received by the Plan
     from the Company.

(6)  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 Company
     or the Plan's consolidated financial statements.

(7)  Subsequent Events
       
     On March 1, 2005, assets totaling  $5,403,429 from the Dan Bottrell Agency,
     Inc.  Profit  Sharing  401(k)  Plan and  Trust,  the  sponsor of which is a
     subsidiary of Trustmark National Bank, were merged into 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, 2004
                                                                      Current
    Identity of issuer                    Description                  value
---------------------------    ---------------------------------    ------------
 Money market account:
    Federated                  Capital Preservation Fund            $ 14,296,460
    AllianceBernstein          Institutional Money Market Fund         1,358,064
    Gartmore                   Money Market Institutional Fund         1,317,338
    Gartmore                   Money Market Security Fund                    958
 Fixed income mutual funds:
*   Performance Funds Trust    Short Term Govt. Inc. Fund              1,568,569
*   Performance Funds Trust    Intermediate Term Govt. Inc. Fund       1,851,742
    Dreyfus                    GNMA Fund                                 391,764
    PIMCO                      Total Return Fund                       1,006,690
 Common stock fund:
*   Trustmark Corporation      Common Stock Fund                      56,205,226
 Equity mutual funds:
*   Performance Funds Trust    Leader's Equity Fund                      895,470
*   Performance Funds Trust    Large-Cap Equity Fund                   7,872,865
*   Performance Funds Trust    Mid-Cap Equity Fund                     8,500,519
    AIM                        Dynamics Fund                             131,811
    Dreyfus                    Mid-Cap Value Fund                      3,918,089
    Franklin                   Balance Sheet Investment Fund           3,003,514
    Franklin                   Mutual Discovery Fund                   1,777,316
    Gartmore                   Inv. Dest. Aggr. Svc. Fund                661,151
    Gartmore                   Inv. Dest. Cons. Svc. Fund                 77,931
    Gartmore                   Inv. Dest. Mod. Svc. Fund                 446,644
    Gartmore                   Inv. Dest. Mod. Aggr. Svc. Fund         1,163,986
    Gartmore                   Inv. Dest. Mod. Cons. Svc. Fund           192,169
    Goldman Sachs              CORE Small Cap Equity Fund              3,989,710
    Goldman Sachs              Growth Opportunity Fund                   105,558
    JP Morgan                  Mid-Cap Value A Fund                      727,258
    Neuberger                  High Income Bond Fund                     147,551
    Neuberger                  Neuberger Berman Genesis Trust          3,481,540
    Oppenheimer                Global Fund                             1,292,683
    Van Kampen                 Equity & Income Fund                    4,024,521
    Van Kampen                 Emerging Growth Fund                    1,056,054
    T. Rowe Price              Preferred Growth Stock Fund               226,675
    Templeton                  Foreign Fund                            2,103,533
                                                                    ------------
                                                                    $123,793,359
                                                                    ============

* Denotes party-in-interest based on the following relationship:

Trustmark  National  Bank serves as  investment  advisor for  Performance  Funds
Trust; Trustmark Corporation is the parent company of Trustmark National Bank.

See accompanying  independent auditors' Report of Independent  Registered Public
Accounting Firm.

Pursuant to the  requirements  of the Securities  Exchange 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 29, 2005