United States
                       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, 2005 or

|_|   TRANSACTION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES AND
      EXCHANGE ACT OF 1934

            For the transaction period from __________ to __________

                        Commission File Number 001-13695

A.    Full title of the plan and the address of the plan, if different from that
      of the issuer named below:

                           Community Bank System, Inc.
                      401(k) Employee Stock Ownership Plan
                             5790 Widewaters Parkway
                             DeWitt, New York 13214

B.    Name of Issuer of the securities held pursuant to the plan and the address
      of its principal executive office.

                           Community Bank System, Inc.
                             5790 Widewaters Parkway
                             DeWitt, New York 13214



                              REQUIRED INFORMATION

1.    Not applicable

2.    Not applicable

3.    Not applicable

4.    The Community Bank System,  Inc. 401(k) Employee Stock Ownership Plan (the
      "Plan") is subject to the requirements of the Employee  Retirement  Income
      Security Act of 1974 ("ERISA"). Attached hereto as Appendix I is a copy of
      the most recent  financial  statements  of the Plan prepared in accordance
      with the financial reporting requirements of ERISA.

Exhibits

(23)  Consent of Dannible & McKee, LLP.



                                   Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the trustee
(or other  persons who  administer  the employee  benefit plan) have duly caused
this annual report to be signed on its behalf by the undersigned,  hereunto duly
authorized.

                                        Community Bank System, Inc.
                                        401(k) Employee Stock Ownership Plan

                                        Community Bank, N. A., Trustee

Dated: June 30, 2006
                                        /s/ Scott Kingsley
                                        ----------------------------------
                                        Scott Kingsley
                                        Executive Vice President and Chief
                                        Financial Officer



                                   Appendix I

                           COMMUNITY BANK SYSTEM, INC.
                      401(K) EMPLOYEE STOCK OWNERSHIP PLAN
                              FINANCIAL STATEMENTS
                                       AND
                              SUPPLEMENTAL SCHEDULE
                                      * * *
                           DECEMBER 31, 2005 AND 2004



Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Index
December 31, 2005 and 2004
--------------------------------------------------------------------------------



                                                                                   Page(s)
                                                                                    
Report of Independent Registered Public Accounting Firm ...........................      1

Financial Statements:

  Statements of Net Assets Available for Benefits .................................      2

  Statements of Changes in Net Assets Available for Benefits, .....................      3

  Notes to Financial Statements ...................................................    4-8

Supplemental Schedule:

  Schedule of Assets (Held at End of Year) (Schedule H, Part IV, Item (i)) ........      9


Note: All other schedules are omitted since they are not applicable or are not
      required based on the disclosure requirements of the Employee Retirement
      Income Security Act of 1974 and applicable regulations issued by the
      Department of Labor.



             Report of Independent Registered Public Accounting Firm

                                                                   June 27, 2006

To the Participants and Administrators of
Community Bank Systems, Inc. 401(k) Employee Stock Ownership Plan

      We have audited the  accompanying  statement of net assets  available  for
benefits of Community Bank Systems,  Inc.  401(k)  Employee Stock Ownership Plan
("the Plan") as of December 31, 2005 and the related statement of changes in net
assets  available  for  benefits  for  the  year  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 audit. The
financial  statements of Community  Bank Systems,  Inc.  401(k)  Employee  Stock
Ownership  Plan as of December 31, 2004,  were audited by other  auditors  whose
report  dated  June  16,  2005,   expressed  an  unqualified  opinion  on  those
statements.

      We  conducted  our audit 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. The Plan is not required
to have, nor were we engaged to perform,  an audit of its internal  control over
financial reporting.  Our audit included  consideration of internal control over
financial  reporting  as  a  basis  for  designing  audit  procedures  that  are
appropriate  in the  circumstances,  but not for the  purpose of  expressing  an
opinion on the  effectiveness  of the Plan's  internal  control  over  financial
reporting. Accordingly, we express no such opinion. 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 audit provides 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, 2005,  and the changes in net assets  available for benefits for
the year then ended in conformity with generally accepted  accounting  principle
(United States).

      Our audit was performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental  Schedule of Assets Held
for Investment Purposes at End of Year as of December 31, 2005, is presented for
the  purpose of  additional  analysis  and 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. This 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/ Dannible & McKee, LLP

                                                           Dannible & McKee, LLP
                                                              Syracuse, New York


                                       1


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Statements of Net Assets Available for Benefits
December 31, 2005 and 2004
--------------------------------------------------------------------------------

                                                        2005            2004
                                                        ----            ----
Assets
Investments, at fair value (Notes B and C):
   Mutual funds                                     $ 25,795,311    $ 23,165,547
   Community Bank System, Inc. common stock           16,199,821      21,857,681
   Collective trust fund                              12,095,892      10,825,829
   Participant loans                                   1,751,673       1,444,780
   Self-directed brokerage                               294,358         246,231
   Money market fund                                     288,273         134,568
                                                    ------------    ------------
      Total investments                               56,425,328      57,674,636

Contributions receivable - employer                      761,438         657,991
                                                    ------------    ------------

      Net assets available for benefits             $ 57,186,766    $ 58,332,627
                                                    ============    ============

    The accompanying notes are an integral part of the financial statements.


                                       2


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Statements of Changes in Net Assets Available for Benefits
Years Ended December 31, 2005 and 2004
--------------------------------------------------------------------------------



                                                                                   2005              2004
                                                                                   ----              ----
                                                                                          
                                                                  Additions
Employee contributions                                                         $  3,849,739     $  3,116,826
Employer contributions                                                            1,777,691        1,591,234
Interest income                                                                      87,924           74,615
Dividend income                                                                   2,060,356        1,365,073
Net (depreciation) appreciation in the fair value of investments
    (Note C)                                                                     (3,813,500)       4,828,599
Transfer from merged plan (Note F)                                                       --          884,184
                                                                               ------------     ------------
     Total additions                                                              3,962,210       11,860,531
                                                                               ------------     ------------

                                                                 Deductions
Benefit payments                                                                  5,035,353        2,736,134
Administrative fees                                                                  72,718           75,393
                                                                               ------------     ------------
     Total deductions                                                             5,108,071        2,811,527
                                                                               ------------     ------------

          Net (decrease)  increase in net assets available for benefits          (1,145,861)       9,049,004

                                          Net assets available for benefits
Beginning of Year                                                                58,332,627       49,283,623
                                                                               ------------     ------------

End of Year                                                                    $ 57,186,766     $ 58,332,627
                                                                               ============     ============


    The accompanying notes are an integral part of the financial statements.


                                       3


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Notes to Financial Statements
December 31, 2005 and 2004
--------------------------------------------------------------------------------

A.    Description of the Plan

      The  following  description  of the  Community  Bank System,  Inc.  401(k)
      Employee  Stock   Ownership   Plan  provides  only  general   information.
      Participants  should  refer  to the  Plan  agreement  for a more  complete
      description of the Plan's provisions.

      General

      The  Plan  is a  defined  contribution  plan  covering  substantially  all
      employees of Community Bank System, Inc. (the "Company") who are age 18 or
      older.  Employees  must have one year of  service to be  eligible  for the
      Company's  contribution.  The Plan also  qualifies  as an  employee  stock
      ownership  plan under the meaning of Section  4975(e)(7)  of the  Internal
      Revenue  Code.  The Plan is subject to the  provisions  of the  Employment
      Retirement Income Security Act of 1974 (ERISA).

      Contributions

      Participants may make voluntary  contributions of up to 90% of their total
      compensation on a pre-tax or after-tax basis up to a maximum  contribution
      of $14,000.  Voluntary  cash  contributions  of up to 6% of total eligible
      compensation  are matched 50% by the Company and such match was $1,016,253
      and $933,211 in 2005 and 2004,  respectively.  The amount of the Company's
      annual discretionary contribution is determined by the Board of Directors,
      within  certain  maximum  limitations.  In addition,  the Company may make
      discretionary  profit  sharing   contributions  to  the  Plan,  which  are
      allocated to individual participant accounts. Such voluntary contributions
      were $761,438 and $658,023 in 2005 and 2004, respectively.

      Participant Accounts

      Each participant's account is credited with the participant's contribution
      and allocations of the Company's contribution as well as Plan earnings and
      charged with an allocation of administrative expenses.  Allocation of Plan
      earnings and administrative  expenses are based on participant earnings or
      account  balances,  as  defined.  The  benefit to which a  participant  is
      entitled is the benefit that can be provided from the participant's vested
      account. Forfeited accounts are allocated annually to eligible participant
      accounts based on the ratio of each eligible participant's compensation to
      total eligible participant  compensation.  Forfeited accounts allocated to
      eligible  participants  amounted  to $27,626 and $7,236 for 2005 and 2004,
      respectively.

      Vesting

      Participants  are  immediately  vested  in  their  contributions  and  the
      Company's  discretionary  profit  sharing  contributions.  Vesting  in the
      Company's  matching  contribution  portion plus actual earnings thereon is
      based on years of continuous  service. A participant is 100 percent vested
      after three years of service.

      Participant Loans

      Participants  may borrow from the Plan a minimum of $1,000 up to a maximum
      equal to the  lesser of $50,000  or 50  percent  of their  vested  account
      balance.  Loans are  collateralized  by the  balance in the  participant's
      account.


                                       4


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Notes to Financial Statements
December 31, 2005 and 2004
--------------------------------------------------------------------------------

      Payment of Benefits

      Normal retirement date for participants under the Plan is the later of age
      65 or the  completion of 5 years of service.  Upon  termination of service
      due to death,  disability  or  retirement,  the  participant  will receive
      either a lump sum amount or installment payments equal to the value of the
      participant's  vested interest in his or her account.  If some or all of a
      participant's  account  balance is allocated to the employee  stock option
      feature of the Plan,  that  portion of the Plan benefit may be paid in the
      form of Company stock.  Upon  termination  of  employment,  if the account
      balance is less than $5,000,  the  participant  will receive a single lump
      sum  amount  equal to the  value  of his or her  account,  otherwise,  the
      participant may elect to defer payment up to age 65. Hardship  withdrawals
      of up to 100% of employee  contributions are available if Internal Revenue
      Service guidelines are met.

      Plan Termination

      Although  it has not  expressed  any intent to do so, the  Company has the
      right  under  the  Plan  to  discontinue  contributions  at any  time  and
      terminate the Plan subject to the  provisions  set forth in ERISA.  In the
      event the Plan terminates,  the net assets of the Plan are to be set aside
      for   participating   employees  based  upon  balances  then  credited  to
      individual  accounts.  Participants  shall be vested 100% in the assets so
      allocated to their accounts.

B.    Significant Accounting Policies

      Basis of Accounting

      The accompanying  financial statements are prepared on an accrual basis of
      accounting in accordance with accounting  principles generally accepted in
      the United States of America.

      Investments

      Investments are stated at aggregate fair value,  except for the SEI Stable
      Asset GIC Fund,  which is stated at cost, which  approximates  fair value.
      Securities that are traded on a national securities exchange are valued at
      the last  reported  sales price on the last business day of the Plan year.
      Shares of mutual funds are valued at the net asset value of shares held by
      the Plan at year-end. Participant loan receivable balances are reported at
      cost, which approximates fair value.

      The Plan  presents  in the  statements  of  changes  in net assets the net
      appreciation  (depreciation)  in the fair value of its investments,  which
      consists of realized  gains or losses as well as  unrealized  appreciation
      (depreciation) on those investments.

      Purchases and sales of securities are recorded on the trade date. Gains or
      losses on sales of securities are based on average cost.  Interest  income
      is  recorded  on  the  accrual  basis.   Dividends  are  recorded  on  the
      ex-dividend date.

      Payment of Benefits

      Benefits are recorded when paid.

      Administrative Expenses

      Certain administrative expenses are paid by the Company. These amounted to
      approximately $280,000 and $258,000,  including approximately $208,000 and
      $185,000 paid to Benefit Plans Administrative  Services,  Inc. ("BPA"), in
      2005 and 2004, respectively. (See Note D).


                                       5


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Notes to Financial Statements
December 31, 2005 and 2004
--------------------------------------------------------------------------------

      Inactive Accounts

      Account  balances of individuals who have withdrawn from  participation in
      the Plan were on an accumulated  basis of  approximately  $10,553,610  and
      $9,889,437 at December 31, 2005 and 2004, respectively.

      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
      amount of assets and liabilities and disclosures of contingent  assets and
      liabilities  at the  date of the  financial  statements  and the  reported
      amounts of revenues  and  expenses  during the  reporting  period.  Actual
      results could differ from those estimates.

      Risks and Uncertainties

      The Plan  provides  for  various  investment  options in mutual  funds and
      Company stock. Investment securities are exposed to various risks, such as
      interest rate, market and credit. Due to the level of risk associated with
      certain  investment  securities  and the level of  uncertainty  related to
      changes in the value of investment  securities,  it is at least reasonably
      possible  that  changes in risk in the near term would  materially  affect
      participants'  account balances and the amounts reported in the statements
      of net assets  available for benefits and the statements of changes in net
      assets available for benefits.

C.    Investments

      Investments  are  held  within  various  common  funds  maintained  by the
      Community Bank, N.A. Trust Department.  Participants, at their discretion,
      may allocate contributions and account balances between various investment
      options  offered  by the Plan.  A brief  description  of these  investment
      options, as provided by the plan administrator, follows:

      Community Bank System,  Inc.  Employee Stock  Ownership Fund - these Funds
      invest in the common stock of the Plan sponsor, which is traded on the New
      York Stock Exchange under the symbol "CBU".

      SEI Stable Asset GIC Fund - a collective trust fund that holds primarily a
      diversified  portfolio  of stable  value  contracts  issued  by  insurance
      companies and banks.  Investments in the SEI Stable Asset GIC Fund are not
      marketable  securities and are reported at cost, which  approximates  fair
      value.

      American Funds  Washington  Mutual  Investors Fund Class A - a mutual fund
      that invests in common stocks and securities  convertible into such common
      stocks.

      Federated  Total Return Bond Fund - a mutual fund seeking to provide total
      return by investing  primarily in a  diversified  portfolio of  investment
      grade fixed income securities.

      Managers  Special  Equity  Fund - a mutual  fund  that  invests  in equity
      securities of small- and medium-sized U.S. companies.


                                       6


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Notes to Financial Statements
December 31, 2005 and 2004
--------------------------------------------------------------------------------

      American  Funds  EuroPacific  Growth  Fund  Class A - a mutual  fund  that
      invests in stocks of issuers located in Europe and the Pacific Basin.

      Dreyfus  S&P 500 Index Fund - a mutual fund that  invests in equities  and
      seeks to match the performance of the S&P 500 Composite Stock Price Index.

      Federated  Mid-Cap  Index Fund - a mutual fund  primarily  that invests in
      stocks of U.S. companies.

      T. Rowe Price Blue Chip Growth Fund - a mutual fund primarily that invests
      in stocks of U.S. companies.

      TD Waterhouse IDA Account - participants select the individual  investment
      securities, including equity securities, mutual funds and bonds.

      The fair value of individual investments which represent 5% or more of net
      assets  available for benefits  ($2,859,338  for 2005 and  $2,916,631  for
      2004) are as follows:



                                                                     2005             2004
                                                                     ----             ----
                                                                            
      Community Bank System, Inc. common stock                   $ 16,199,821     $ 21,857,681
      SEI Stable Asset GIC Fund                                    12,095,892       10,825,829
      American Funds Washington Mutual Investors Fund Class A       8,024,306        8,166,459
      American Funds EuroPacific Growth Fund Class A                3,638,884        2,490,186
      Manager Special Equity Fund                                   3,430,912        3,226,693
      Federated Total Return Bond Fund                              3,204,861        2,998,040
      T. Rowe Price Blue Chip Growth Fund                           3,055,382        2,621,016


      The Plan's investments (depreciated) appreciated in value as follows:



                                                                     2005             2004
                                                                     ----             ----
                                                                            
      Community Bank System, Inc. common stock                   $ (4,335,817)    $  2,602,117
      Mutual funds                                                    522,317        2,226,482
                                                                 ------------     ------------
         Total net appreciation in fair value of investments     $ (3,813,500)    $  4,828,599
                                                                 ============     ============


D.    Transactions with Parties-in-Interest

      The assets of the Plan are  administered by BPA, a subsidiary of Community
      Bank System, Inc. The Company paid BPA approximately $208,000 and $185,000
      for  record  keeping,  trustee  and  other  services  in  2005  and  2004,
      respectively.


                                       7


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Notes to Financial Statements
December 31, 2005 and 2004
--------------------------------------------------------------------------------

      The Plan held  718,396 and  773,723  shares of the Plan  sponsor's  common
      stock at  December  31,  2005 and  2004,  respectively.  The cost of these
      shares  at  December  31,  2005 and  2004 is  $9,696,141  and  $9,558,394,
      respectively,  and  their  fair  value at  December  31,  2005 and 2004 is
      $16,199,821  and   $21,857,681,   respectively.   The  Company  enacted  a
      two-for-one stock split in the form of a 100% stock dividend paid on April
      12, 2004 to  shareholders  of record on March 17, 2004.  Accordingly,  all
      2004 share amounts have been adjusted to reflect the stock split.

      Dividends received on the investment in Community Bank System, Inc. common
      stock  amounted to $577,893 and $525,798 for the years ended  December 31,
      2005 and 2004,  respectively.  The Plan sold 212,964 and 164,375 shares of
      Community   Bank  System,   Inc.   common  stock  during  2005  and  2004,
      respectively,  and purchased  191,567 and 191,968 shares of Community Bank
      System, Inc. common stock during 2005 and 2004, respectively.

E.    Income Tax Status

      The Plan  obtained its most recent  determination  letter in July 2003, in
      which the Internal Revenue Service stated that the plan, as then designed,
      was in compliance  with Section  401(a) of the Internal  Revenue Code. The
      Plan has been amended since receiving the determination  letter,  however,
      the Plan  administrator  believes that the Plan is currently  designed and
      being  operated in  compliance  with the  applicable  requirements  of the
      Internal Revenue Code.

F.    Plan Merger

      On May 14, 2004,  the Company  acquired First Heritage Bank and merged the
      First  Heritage  Bank 401(k) Plan into the Plan.  Accordingly,  total plan
      assets of $884,184 were transferred to the Plan.


                                       8


Community Bank System, Inc.
401(k) Employee Stock Ownership Plan
Schedule of Assets (Held at End of Year)
(Schedule H, Part IV, Item (i))
December 31, 2005
--------------------------------------------------------------------------------



(a)  (b) Identify of issue, borrower, lessor or similar     (c) Description of investment including          (e) Current
                            party                               maturity date, rate of interest,                 value
                                                               collateral, par or maturity value
                                                                                                        
                                Mutual Funds

     American Funds Washington Mutual Investors Fund
     Class A                                                    Mutual fund - 260,192 shares                  $ 8,024,306
     Managers Special Equity Fund                               Mutual fund - 39,540 shares                     3,430,912
     Federated Total Return Bond Fund                           Mutual fund - 303,778 shares                    3,204,861
     T. Rowe Price Blue Chip Growth Fund                        Mutual fund - 93,494 shares                     3,055,382
     American Funds EuroPacific Growth Fund Class A             Mutual fund - 88,537 shares                     3,638,884
     Dreyfus S&P 500 Index Fund                                 Mutual fund - 67,978 shares                     2,471,008
     Federated Mid-Cap Index Fund                               Mutual fund - 88,897 shares                     1,969,958
                                                                                                              -----------
                                                                                                               25,795,311

                              Common stock of plan
                                     sponsor

*    Community Bank System, Inc.                                Common stock - 718,396 shares                  16,199,821

                              Collective Trust Fund
     SEI Stable Asset GIC Fund                                  Collective trust fund - 12,095,892 shares      12,095,892

                                    Loan Fund
     Participant loans                                          Loan, 5.0% - 10.5%                              1,751,673

                             Self Directed brokerage
     TD Waterhouse IDA Account                                  Self-directed brokerage                           294,358

                                Money Market Fund
     ReservePlus Money Market                                   Money market fund  - 134,568 shares               288,273
                                                                                                              -----------
          Total investments                                                                                   $56,425,328
                                                                                                              -----------


* - Denotes party-in-interest


                                       9