<PAGE>   1



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 10-K

[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
    ACT OF 1934

                           FOR THE FISCAL YEAR ENDED DECEMBER 31, 2000

                                       OR

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
    ACT OF 1934

               FOR THE TRANSITION PERIOD FROM   N/A   TO   N/A
                                              ------     ------

                         COMMISSION FILE NUMBER 0-16540
                                                -------

                              UNITED BANCORP, INC.
           ----------------------------------------------------------
             (Exact name of registrant as specified in its Charter.)

<TABLE>
<S><C>
                      OHIO                                                        34-1405357
--------------------------------------------------------------         ----------------------------------
(State or other jurisdiction of incorporation or organization)         (IRS Employer Identification No.)

</TABLE>


    201 SOUTH FOURTH STREET, MARTINS FERRY, OHIO                     43935
    ---------------------------------------------               ---------------
       (Address of principal executive offices)                    (ZIP Code)


REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE:  (740) 633-0445
                                                     --------------

           SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

<TABLE>
<S><C>
COMMON STOCK, PAR VALUE $1.00 A SHARE          NASDAQ REGULAR MARKET (SMALLCAP)
-------------------------------------          --------------------------------
         (Title of class)                (Name of each exchange on which registered)
</TABLE>


           SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                      COMMON STOCK, PAR VALUE $1.00 A SHARE
            --------------------------------------------------------
                                (Title of class)

INDICATE BY CHECK MARK WHETHER THE REGISTRANT (1) HAS FILED ALL REPORTS REQUIRED
TO BE FILED BY SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 DURING
THE PRECEDING 12 MONTHS (OR FOR SUCH SHORTER PERIOD THAT THE REGISTRANT WAS
REQUIRED TO FILE SUCH REPORTS), AND (2) HAS BEEN SUBJECT TO SUCH FILING
REQUIREMENTS FOR THE PAST 90 DAYS. YES   X    NO
                                       ----      -----

INDICATE BY CHECK MARK IF DISCLOSURE OF DELINQUENT FILERS PURSUANT TO ITEM 405
OF REGULATION S-K IS NOT CONTAINED HEREIN, AND WILL NOT BE CONTAINED TO THE BEST
OF REGISTRANT'S KNOWLEDGE, IN DEFINITIVE PROXY OR INFORMATION STATEMENTS
INCORPORATED BY REFERENCE IN PART III OF THIS FORM 10-K OR ANY AMENDMENT TO THIS
FORM 10-K. [X]

THE AGGREGATE MARKET VALUE OF THE VOTING STOCK HELD BY NON-AFFILIATES OF THE
REGISTRANT AS OF MARCH 15, 2001.

                   COMMON STOCK, $1.00 PAR VALUE: $32,496,261
                 ----------------------------------------------

THE NUMBER OF SHARES OUTSTANDING OF THE REGISTRANT'S CLASSES OF COMMON STOCK AS
OF MARCH 15, 2001.

                 COMMON STOCK, $1.00 PAR VALUE: 3,034,176 SHARES
                 -----------------------------------------------

DOCUMENTS INCORPORATED BY REFERENCE
PORTIONS OF THE ANNUAL SHAREHOLDERS REPORT FOR THE YEAR ENDED DECEMBER 31, 2000
ARE INCORPORATED BY REFERENCE INTO PARTS I AND II, (INDEX ON PAGE 2)

PORTIONS OF THE PROXY STATEMENT FOR THE ANNUAL SHAREHOLDERS MEETING TO BE HELD
APRIL 18, 2000 ARE INCORPORATED BY REFERENCE INTO PART III (INDEX ON PAGE 2).


<PAGE>   2
                         UNITED BANCORP, INC. FORM 10-K

            INDEX OF ITEMS INCORPORATED BY REFERENCE WITHIN FORM 10-K

<TABLE>
<CAPTION>

                     FORM 10-K
PAGE #            ITEM DESCRIPTION                                              REFERENCE DESCRIPTION
------            ----------------                                              ---------------------
<S>      <C>                                   <C>
     3     Part I, Item 1, (a)                   Incorporated by reference to Pages 6-7 and 10-11 of the Annual Report To
                                                 Shareholders.

     3     Part I, Item 1, (b)                   Incorporated by reference to Page 38, Note 1 of the Annual Report To
                                                 Shareholders.

     4     Part I, Item 1, I                     Incorporated by reference to Pages 29-30 of the Annual Report To
                                                 Shareholders.

     5     Part I, Item 1, II, B                 Incorporated by reference to Page 43, Note 2 of the Annual Report To
                                                 Shareholders.

     7     Part I, Item 1, III, C, 4             Incorporated by reference to Page 50, Note 11 of the Annual Report To
                                                 Shareholders.

     7     Part I, Item 1, IV                    Incorporated by reference to Page 23-24 and Pages 38-39, Note 1 the Annual
                                                 Report To Shareholders.

     10    Part I, Item 1, V, A                  Incorporated by reference to Page 29 of the Annual Report To Shareholders.

     10    Part I, Item 1, VI, A                 Incorporated by reference to Page 29 of the Annual Report To Shareholders.

     11    Part I, Item 2                        Incorporated by reference to Pages 6-7 and 10-11 of the Annual Report To
                                                 Shareholders.

     11    Part I, Item 3                        Incorporated by reference to Page 41, Note 1 of the Annual Report To
                                                 Shareholders.

     11    Part II, Item 5                       Incorporated by reference to Page 4 of the Annual Report To Shareholders.

     12    Part II, Item 6                       Incorporated by reference to Page 18 of the Annual Report To Shareholders.

     12    Part II, Item 7                       Incorporated by reference to Pages 19-32, of the Annual Report To
                                                 Shareholders.

     12    Part II, Item 7A                      Incorporated by reference to Pages 26-27 of the Annual Report To
                                                 Shareholders.

     12    Part II, Item 8                       Incorporated by reference to Pages 33-55 of the Annual Report To
                                                 Shareholders.

     13    Part III, Item 10                     Incorporated by reference to Pages 3-8 of the Proxy Statement.

     13    Part III, Item 11                     Incorporated by reference to Pages 10-12 of the Proxy Statement.

     13    Part III, Item 12                     Incorporated by reference to Pages 3-8 of the Proxy Statement.

     13    Part III, Item 13                     Not applicable.

     14    Part IV, Item 14, (a), 1              Incorporated by reference to Pages 33-55 of the Annual Report To
                                                 Shareholders.

     14    Part IV, Item 14, (a), 2              Incorporated by reference to Page 55 of the Annual Report To Shareholders.

     14    Part IV, Item 14, (a), 3, Exhibit 10  Incorporated by reference to Page 8 of the Proxy Statement.

     14    Part IV, Item 14, (a), 3, Exhibit 11  Incorporated by reference to Page 40 and Page 54 of the Annual Report To
                                                 Shareholders.
</TABLE>



                                       2
<PAGE>   3

                         UNITED BANCORP, INC. FORM 10-K

PART I

ITEM 1   DESCRIPTION OF BUSINESS

             (A)  GENERAL DEVELOPMENT OF BUSINESS

                  United Bancorp, Inc. (Company) is a financial holding company
                  headquartered in Martins Ferry, Ohio. The Company has two
                  wholly-owned subsidiary banks, The Citizens Savings Bank,
                  Martins Ferry, Ohio (CITIZENS) and The Community Bank,
                  Lancaster, Ohio (COMMUNITY), collectively "Banks". For
                  additional information about the Company's location and
                  description of business, refer to Pages 6-7 and 10-11,
                  Corporate Profile, in the Annual Report To Shareholders for
                  the year ended December 31, 2000.

             (B)  FINANCIAL INFORMATION ABOUT BUSINESS SEGMENTS

                  Refer to Page 38, Note 1 of the Annual Report To Shareholders.

             (C)  NARRATIVE DESCRIPTION OF BUSINESS

                  The Company is a multi-bank holding company as defined under
                  the Bank Holding Company Act of 1956, as amended (the "BHC
                  Act"). The BHC Act regulates acquisitions by the Company of
                  voting shares or assets of any bank or other company. The
                  Company is subject to the reporting requirements of, and
                  examination and regulation by, the Board of Governors of the
                  Federal Reserve System, as well as reporting requirements
                  under the Securities and Exchange Commission Act of 1934.

                  The Company's Banks are located in northeastern, eastern, and
                  southeastern Ohio and are engaged in the business of
                  commercial and retail banking in Belmont, Harrison, Jefferson,
                  Tuscarawas, Carroll, Athens, Hocking, and Fairfield counties
                  and the surrounding localities. The Banks provide a broad
                  range of banking and financial services, which include
                  accepting demand, savings and time deposits and granting
                  commercial, real estate and consumer loans. CITIZENS conducts
                  its business through its main office in Martins Ferry, Ohio
                  and nine branches located in Bridgeport, Colerain, Dellroy,
                  Dover, Jewett, New Philadelphia, St. Clairsville,
                  Sherrodsville, and Strasburg, Ohio. In 1999, CITIZENS opened a
                  full service brokerage division known as Brokerage United with
                  securities provided through Raymond James Financial Services,
                  Inc. member NASD/SIPC. COMMUNITY conducts its business through
                  its seven offices in Amesville, Glouster, Lancaster, and
                  Nelsonsville, Ohio.

                  The markets in which the Banks' operate continue to be highly
                  competitive. CITIZENS competes for loans and deposits with
                  other retail commercial banks, savings and loan associations,
                  finance companies, credit unions and other types of financial
                  institutions within the Mid-Ohio valley geographic area along
                  the eastern border of Ohio, extending into the northern
                  panhandle of West Virginia and the Tuscarawas and Carroll
                  County geographic areas of northeastern Ohio. COMMUNITY also
                  encounters similar competition for loans and deposits
                  throughout the Athens, Hocking, and Fairfield County
                  geographic areas of central and southeastern Ohio.

                  On November 12, 1999, President Clinton signed the
                  Graham-Leach-Bliley Act of 1999 ("GLB Act"), which is intended
                  to modernize the financial services industry. The GLB Act
                  sweeps away large parts of a regulatory framework that had its
                  origins in the Depression Era of the 1930s. Effective March
                  11, 2000, new opportunities will become available for banks,
                  other depository institutions, insurance companies and
                  securities firms to enter into combinations that permit a
                  single financial service organization to offer customers a
                  more complete array of financial products and services. The
                  GLB Act provides a new regulatory framework for regulation
                  through the financial holding company, which will have as its
                  umbrella regulator the Federal Reserve Board. The functional
                  regulation of the financial holding company's separately
                  regulated subsidiaries will be conducted by their primary
                  functional regulator. The GLB Act makes satisfactory or above
                  Community Reinvestment Act compliance for insured depository
                  institutions and their financial holding companies necessary
                  in order for them to engage in new financial activities. The
                  GLB Act provides a federal right to privacy of non-public
                  personal information of individual customers. The Company and
                  Banks are also subject to certain state laws that deal with
                  the use and distribution of non-public personal information.



                                       3
<PAGE>   4
                         UNITED BANCORP, INC. FORM 10-K

                  ITEM 1 DESCRIPTION OF BUSINESS (CONTINUED)

             (C)  NARRATIVE DESCRIPTION OF BUSINESS (CONTINUED)

                  The Company's two subsidiary banks are subject to regulation
                  by the Ohio Division of Financial Institutions and the Federal
                  Deposit Insurance Corporation ("FDIC"). The regulations and
                  restrictions affecting the Banks pertain to, among other
                  things, allowable loans, guidelines for allowance for loan
                  losses, accountability for fair and accurate disclosures to
                  customers and regulatory agencies, permissible investments and
                  limitations of risk and regulation of capital requirements for
                  safe and sound operation of the financial institution.

                  The Banks have no single customer or related group of
                  customers whose banking activities, whether through deposits
                  or lending, would have a material impact on the continued
                  earnings capabilities if those activities were removed.

                  The Company itself, as a shell holding company, has no
                  compensated employees. CITIZENS has 84 full time employees,
                  with 25 of these serving in a management capacity and 10 part
                  time employees. COMMUNITY has 36 full time employees, with 13
                  serving in a management capacity and 6 part time employees.
                  The Company considers employee relations to be good at all
                  subsidiary locations.

             (D)  FINANCIAL INFORMATION ABOUT FOREIGN AND DOMESTIC OPERATIONS

                  Not applicable.

         I        DISTRIBUTION OF ASSETS, LIABILITIES AND STOCKHOLDERS EQUITY;
                  INTEREST RATES AND INTEREST DIFFERENTIAL

                  A        Refer to Page 29 of the Annual Report To Shareholders

                  B        Refer to Page 29 of the Annual Report To Shareholders

                  C        Refer to Page 30 of the Annual Report To Shareholders



                                       4
<PAGE>   5

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

         II   INVESTMENT PORTFOLIO
                  A   The following table sets forth the carrying amount of
                      securities at December 31, 2000, 1999 and 1998:


<TABLE>
<CAPTION>


                                                                        DECEMBER 31,
                                                              --------------------------------
                                (In thousands)                  2000        1999         1998
                                                              -------      -------     -------
<S>                                                         <C>         <C>          <C>
                      AVAILABLE FOR SALE
                        US Treasury obligations               $    --      $    --     $ 1,509
                        US Agency obligations                  75,685       65,952      67,506
                        Mortgage-backed obligations             1,930        2,017       3,028
                        State and municipal obligations        13,434       14,187       2,197
                        Other securities                        3,390        3,206       1,597
                                                              -------      -------     -------
                                                              $94,439      $85,362     $75,837
                                                              =======      =======     =======
                                (In thousands)

                      HELD TO MATURITY
                        US Agency obligations                 $ 2,496      $ 2,494     $    --
                        State and municipal obligations         8,306        7,300      21,848
                                                              -------      -------     -------
                                                              $10,802      $ 9,794     $21,848
                                                              =======      =======     =======
</TABLE>

                  B   Refer to Page 43, Note 2 of the Annual Report To
                      Shareholders.

                  C   Excluding holdings of U.S. Agency, there were no
                      investments in securities of any one issuer exceeding 10%
                      of the Company's consolidated shareholders' equity at
                      December 31, 2000.

         III  LOAN PORTFOLIO

                  A   TYPES OF LOANS

                      The amounts of gross loans outstanding at December 31,
                      2000, 1999, 1998, 1997, and 1996 are shown in the
                      following table according to types of loans:

<TABLE>
<CAPTION>

                                                                           DECEMBER 31,
                                         ---------------------------------------------------------------------
                                             2000           1999           1998           1997         1996
                                         ----------     ----------     -----------     ---------    ----------
<S>                                    <C>            <C>            <C>            <C>            <C>
                (In thousands)

      Commercial loans                   $   20,415     $   15,463     $    12,912     $  16,636     $  15,065
      Commercial real estate loans           64,812         60,305          54,195        49,189        41,565
      Real estate loans                      55,931         51,357          49,438        49,857        52,955
      Installment loans                      55,339         53,391          47,676        55,795        56,931
                                         ----------     ----------     -----------     ---------     ---------
        Total loans                      $  196,497     $  180,516     $   164,221     $ 171,477     $ 166,516
                                         ==========     ==========     ===========     =========     =========
</TABLE>


       Construction loans were not significant for the periods discussed.


                                       5
<PAGE>   6

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

         III LOAN PORTFOLIO (CONTINUED)

                  B   MATURITIES AND SENSITIVITIES OF LOANS TO CHANGES IN
                      INTEREST RATES
                      The following is a schedule of commercial and commercial
                      real estate loans at December 31, 2000 maturing within the
                      various time frames indicated:

<TABLE>
<CAPTION>

                                                             ONE YEAR        ONE THROUGH        AFTER
                                  (In thousands)             OR LESS         FIVE YEARS       FIVE YEARS       TOTAL
                                                           ------------    --------------   ------------   ------------
<S>                                                      <C>             <C>              <C>            <C>
                          Commercial loans                 $     18,254    $        1,771   $         390    $   20,415
                          Commercial real estate loans           21,475            35,553           7,784        64,812
                                                           ------------    --------------   -------------    ----------
                            Total                          $     39,729    $       37,324   $       8,174    $   85,227
                                                           ============    ==============   =============    ==========
</TABLE>

                      The following is a schedule of fixed rate and variable
                      rate commercial and commercial real estate loans at
                      December 31, 2000 due to mature after one year:


<TABLE>
<CAPTION>

                                    (In thousands)            FIXED RATE     VARIABLE RATE    TOTAL > ONE YEAR
                                                             ------------   --------------    -----------------
<S>                                                          <C>            <C>               <C>
                            Commercial loans                 $      2,161   $           --    $          2,161
                            Commercial real estate loans           10,587           32,750              43,337
                                                             ------------   --------------    ----------------
                              Total                          $     12,748   $       32,750    $         45,498
                                                             ============   ==============    ================
</TABLE>

                      Variable rate loans are those loans with floating or
                      adjustable interest rates.

                  C   RISK ELEMENTS

                      1.   NONACCRUAL, PAST DUE, RESTRUCTURED AND IMPAIRED LOANS

                      The following schedule summarizes nonaccrual loans,
                      accruing loans which are contractually 90 days or more
                      past due, troubled debt restructurings and impaired loans
                      at December 31, 2000, 1999, 1998, 1997 and 1996:

<TABLE>
<CAPTION>

                                                                                      DECEMBER 31, 2000
                                                                  ----------------------------------------------------------
                                    (In thousands)                   2000         1999       1998        1997         1996
                                                                  ----------   ---------  ----------  ---------    ---------
<S>                                                             <C>          <C>        <C>         <C>         <C>
                      Nonaccrual basis                            $      793   $     987  $      399  $     480    $     667
                      Accruing loans 90 days or greater past due         124          36         150        319          256
                      Troubled debt restructuring                        N/A         N/A         N/A        N/A          N/A

                      Impaired loans                                      (1)         (1)         (1)        (1)          (1)

</TABLE>

                      (1) Loans considered impaired under the provisions of SFAS
                      No. 114 and interest recognized on a cash received basis
                      were not considered material during any of the periods
                      presented.

                      The additional amount of interest income that would have
                      been recorded on nonaccrual loans, had they been current,
                      totaled $56,767 for the year-ended December 31, 2000.


                                       6
<PAGE>   7

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

         III LOAN PORTFOLIO (CONTINUED)

                  1.  NONACCRUAL, PAST DUE, RESTRUCTURED AND IMPAIRED LOANS
                      (CONTINUED)

                      Interest income is not reported when full loan repayment
                      is doubtful, typically when the loan is impaired or
                      payments are past due over 90 days. Payments received on
                      such loans are reported as principal reductions.

                      A loan is impaired when full payment under the loan terms
                      is not expected. Impairment is evaluated in total for
                      smaller-balance loans of similar nature such as
                      residential mortgage, consumer, and credit card loans, and
                      on an individual loan basis for other loans. If a loan is
                      impaired, a portion of the allowance is allocated so that
                      the loan is reported, net, at the present value of
                      estimated future cash flows using the loan's existing rate
                      or at the fair value of collateral if repayment is
                      expected solely from the collateral.

                  2.  POTENTIAL PROBLEM LOANS

                      The Company had no potential problem loans as of December
                      31, 2000 which have not been disclosed in Table C 1., but
                      where known information about possible credit problems of
                      borrowers causes management to have serious doubts as to
                      the ability of such borrowers to comply with the present
                      loan repayment terms and which may result in disclosure of
                      such loans into one of the problem loan categories.

                  3.  FOREIGN OUTSTANDING

                      Not applicable.

                  4.  LOAN CONCENTRATIONS

                      Refer to Page 50, Note 11 of the Annual Report To
                      Shareholders.

         D.       OTHER INTEREST-BEARING ASSETS

                      Not applicable.


         IV SUMMARY OF LOAN LOSS EXPERIENCE

                  For additional explanation of factors which influence
                  management's judgment in determining amounts charged to
                  expense, refer to Pages 23-24, "Management Discussion and
                  Analysis" and Pages 38 - 39, Note 1 of the Annual Report To
                  Shareholders.



                                       7
<PAGE>   8

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

         IV SUMMARY OF LOAN LOSS EXPERIENCE (CONTINUED)

                  A   ANALYSIS OF THE ALLOWANCE FOR LOAN LOSSES

                      The following schedule presents an analysis of the
                      allowance for loan losses, average loan data and related
                      ratios for the years ended December 31, 2000, 1999, 1998,
                      1997 and 1996:

<TABLE>
<CAPTION>

                            (In thousands)                2000           1999           1998          1997          1996
                                                       ----------     ----------     ----------   ----------     ----------
<S>                                                   <C>            <C>            <C>          <C>            <C>
                  LOANS

                  Loans outstanding                    $  196,497     $  180,516     $  164,221   $  171,477     $  166,516
                  Average loans outstanding            $  190,386     $  168,868     $  168,626   $  169,066     $  160,409


                            (In thousands)

                  ALLOWANCE FOR LOAN LOSSES

                  Balance at beginning of year         $    3,110     $    3,033     $    3,039   $    2,756     $    2,593
                  Loan charge-offs:
                       Commercial                             125             85            139          125            467
                       Commercial real estate                  79             30             --           --             --
                       Real estate                            275             21             51           20             40
                       Installment                            716            807            861          661            583
                                                       ----------     ----------     ----------   ----------     ----------
                  Total loan charge-offs                    1,195            943          1,051          806          1,090
                                                       ----------     ----------     ----------   ----------     ----------

                  Loan recoveries
                       Commercial                               2             50             87           32             13
                       Commercial real estate                  28             12                          --             --
                       Real estate                              4              3              9            3              5
                       Installment                            254            228            151          122             70
                                                       ----------     ----------     ----------   ----------     ----------
                  Total loan recoveries                       288            293            247          157             88
                                                       ----------     ----------     ----------   ----------     ----------

                  Net loan charge-offs                        907            650            804          649          1,002

                  Provision for loan losses                   587            727            798          932          1,165
                                                       ----------     ----------     ----------   ----------     ----------

                  Balance at end of year               $    2,790     $    3,110     $    3,033   $    3,039     $    2,756
                                                       ==========     ==========     ==========   ==========     ==========

                  Ratio of net charge-offs to average
                    loans outstanding for the year           0.49%          0.38%          0.48%        0.38%          0.62%
                                                       ==========     ==========     ==========   ==========     ==========
</TABLE>


                                       8

<PAGE>   9

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

         IV SUMMARY OF LOAN LOSS EXPERIENCE (CONTINUED)

                B     ALLOCATION OF THE ALLOWANCE FOR LOAN LOSSES

                      The following table allocates the allowance for possible
                      loan losses at December 31, 2000, 1999, 1998, 1997 and
                      1996. The allowance has been allocated according to the
                      amount deemed to be reasonably necessary to provide for
                      the probability of losses being incurred within the
                      following categories of loans at the dates indicated:

<TABLE>
<CAPTION>


                                                      2000                                                    1999
                                            --------------------------                              -------------------------
                                                          % OF LOANS                                              % OF LOANS
                      (In thousands)        ALLOWANCE      TO TOTAL            (In thousands)        ALLOWANCE     TO TOTAL
                Loan type                     AMOUNT         LOANS       Loan type                     AMOUNT        LOANS
                                            -----------    -----------                              ------------   ----------
<S>                                        <C>           <C>             <C>                      <C>           <C>
                    Commercial              $      263          10.39%       Commercial             $       195         8.57%
                    Commercial real estate         835          32.98%       Commercial real estate         439        33.40%
                    Real estate                    461          28.46%       Real estate                    343        28.45%
                    Installment                    781          28.17%       Installment                    620        29.58%
                    Unallocated                    450             N/A       Unallocated                  1,513           N/A
                                            -----------    -----------                              ------------   -----------
                     Total                  $    2,790         100.00%        Total                 $     3,110       100.00%
                                            ===========    ===========                              ============   ===========
</TABLE>

<TABLE>
<CAPTION>

                                                      1998                                                    1997
                                            --------------------------                              -------------------------
                                                          % OF LOANS                                              % OF LOANS
                      (In thousands)        ALLOWANCE      TO Total            (In thousands)        ALLOWANCE     TO TOTAL
                Loan type                     AMOUNT         LOANS       Loan type                     AMOUNT        LOANS
                                            -----------    -----------                              ------------   ----------
<S>                                        <C>           <C>             <C>                      <C>           <C>
                    Commercial              $      215           7.87%       Commercial             $       403         9.70%
                    Commercial real estate         432          33.00%       Commercial real estate         322        28.69%
                    Real estate                    567          30.10%       Real estate                    606        29.07%
                    Installment                    818          29.03%       Installment                  1,200        32.54%
                    Unallocated                  1,001             N/A       Unallocated                    508           N/A
                                            -----------    -----------                              ------------   ----------
                     Total                  $    3,033         100.00%        Total                 $     3,039       100.00%
                                            ===========    ===========                              ============   ==========
</TABLE>

<TABLE>
<CAPTION>

                                                      1996
                                            --------------------------
                                                          % OF LOANS
                      (In thousands)        ALLOWANCE      TO TOTAL
                Loan type                     AMOUNT         LOANS
                                            -----------    -----------
<S>                                        <C>           <C>
                    Commercial              $      320           9.05%
                    Commercial real estate         292          24.96%
                    Real estate                    601          31.80%
                    Installment                    841          34.19%
                    Unallocated                    702             N/A
                                            -----------    -----------
                     Total                  $    2,756         100.00%
                                            ===========    ===========
</TABLE>


                                       9
<PAGE>   10

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

                V     DEPOSITS

                  A   SCHEDULE OF AVERAGE DEPOSIT AMOUNTS AND RATES

                        (1)      Refer to Page 29 of the Annual Report To
                                 Shareholders.
                        (2)      Refer to Page 29 of the Annual Report To
                                 Shareholders.
                        (3)      Refer to Page 29 of the Annual Report To
                                 Shareholders.
                        (4)      Refer to Page 29 of the Annual Report To
                                 Shareholders.
                        (5)-(8)  Not applicable.

                  B   OTHER CATEGORIES

                      Not applicable.

                  C   FOREIGN DEPOSITS

                      Not applicable.

                  D   MATURITY ANALYSIS OF TIME DEPOSITS GREATER THAN $100,000.

                      The following schedule details the maturities of time
                      certificates of deposit in amounts of $100,000 or more for
                      the year ended December 31, 2000:

<TABLE>

<S>                                                        <C>
                               (In  thousands)
                         Three months or less                $       2,738
                         Over three through six months               3,412
                         Over six through twelve months              5,701
                         Over twelve months                         17,566
                                                             -------------
                           Total                             $      29,417
                                                             =============
</TABLE>

                  E   TIME DEPOSITS GREATER THAN $100,000 ISSUED BY FOREIGN
                      OFFICES.

                      Not applicable.

                VI    RETURN ON EQUITY AND ASSETS

                      The ratio of net income to daily average total assets and
                      average shareholders' equity, and certain other ratios,
                      were as follows:

                      (1) Refer to Page 18 of the Annual Report To Shareholders.


                                       10
<PAGE>   11

                         UNITED BANCORP, INC. FORM 10-K

ITEM 1   DESCRIPTION OF BUSINESS (CONTINUED)

         VII    SHORT-TERM BORROWINGS

                  Information concerning securities sold under agreements to
                  repurchase is summarized as follows:

<TABLE>
<CAPTION>

                                  (In thousands)                          2000            1999           1998
                                                                       ----------      ----------     ----------
<S>                                                                   <C>             <C>             <C>
                  Balance at December 31,                               $ 4,861         $  5,788        $ 7,733
                  Weighted average interest rate at December 31,          5.52%            3.80%          4.44%
                  Average daily balance during the year                 $ 5,177         $  7,306        $ 7,817
                  Average interest rate during the year                   5.45%            4.30%          4.66%
                  Maximum month-end balance during the year             $ 6,117         $  8,506        $ 9,109
</TABLE>


                  Securities sold under agreements to repurchase are financing
                  arrangements whereby the Company sells securities and agrees
                  to repurchase the identical securities at the maturities of
                  the agreements at specified prices

                  Information concerning the cash management line of credit from
                  the Federal Home Loan Bank of Cincinnati, Ohio is summarized
                  as follows:

<TABLE>
<CAPTION>

                                  (In thousands)                          2000            1999           1998
                                                                       ----------      ----------     ----------
<S>                                                                   <C>             <C>             <C>
                  Balance at December 31,                              $ 14,824        $ 19,145        $ 9,175
                  Weighted average interest rate at December 31,          6.75%           4.75%          5.02%
                  Average daily balance during the year                $ 13,545        $  9,363        $ 2,085
                  Average interest rate during the year                   6.26%           5.55%          5.95%
                  Maximum month-end balance during the year            $ 20,217        $ 22,028        $ 9,175
</TABLE>

                  No other individual component of the borrowed funds total
                  comprised more than 30% of shareholders' equity and
                  accordingly are not disclosed in detail.

ITEM 2   PROPERTIES

         Refer to Pages 6-7 and 10-11, "Corporate Profile" in the Annual Report
         To Shareholders. Management believes the properties described on Pages
         6-7 and 10-11 of the Annual Report to be in good operating condition
         for the purpose for which it is used. The properties are unencumbered
         by any mortgage or security interest and is, in management's opinion,
         adequately insured.

ITEM 3   LEGAL PROCEEDINGS

         Refer to Page 41, Note 1 of the Annual Report To Shareholders.

ITEM 4   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         No motions were submitted to shareholders for a vote during the fourth
         quarter of 2000.

PART II

ITEM 5   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED SHAREHOLDER MATTERS

         Refer to Page 4, "Shareholder Information" of the Annual Report To
         Shareholders.


                                       11
<PAGE>   12

                         United Bancorp, Inc. Form 10-K



ITEM 6   SELECTED FINANCIAL DATA

         Refer to Page 18, "Five Year Performance Summary" of the Annual Report
         To Shareholders.



ITEM 7   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS

         Refer to Pages 19 - 32, "Management's Discussion and Analysis" of the
         Annual Report To Shareholders.

ITEM 7A  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

         Refer to Pages 26 - 27, "Asset/Liability Management and Sensitivity to
         Market Risks" of the Annual Report To Shareholders.

ITEM 8   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         Refer to Pages 33 - 55 of the Annual Report To Shareholders.

ITEM 9   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS

         There were no changes in or disagreements with accountants.


                                       12
<PAGE>   13

                         UNITED BANCORP, INC. FORM 10-K

PART III

ITEM 10  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

         (a)    Refer to Pages 3 - 8 of the Proxy Statement.
         (b)    Executive Officers of the Registrant:

<TABLE>

<S>                                      <C>    <C>
                  James W. Everson         62     Chairman, President and Chief Executive Officer

                  Alan M.  Hooker          49     Executive Vice President -- Administration

                  Norman F. Assenza, Jr.   54     Vice President -- Operations and Secretary

                  Randall M. Greenwood     36     Vice President -- Chief Financial Officer, Treasurer

                  James A. Lodes           54     Vice President -- Lending
</TABLE>


         (1)    Each individual has held the position noted during the past five
                years, except for the following:

                Randall M. Greenwood served as a Business Assurance Manager of
                Coopers and Lybrand LLP of Columbus, Ohio from 1993 to November
                of 1997. He served as a Manager for BankOne Corporation in
                Columbus, Ohio from February 1991 to August 1993 and as a
                Supervisor at Coopers and Lybrand LLP in Columbus, Ohio from
                September 1986 through February 1991. He has served as Vice
                President -- Chief Financial Officer of United Bancorp, Inc.
                and as Senior Vice President -- Chief Financial Officer of The
                Citizens Savings Bank, Martins Ferry, Ohio since December 1997.

                Alan M. Hooker served as President of Fairfield National
                Division of the Park National Bank where he also served on their
                Advisory Board. He has held senior level banking positions with
                financial institutions in Washington, D.C., and Baltimore,
                Maryland. He has served as President and Chief Executive Officer
                of The Community Bank, Glouster, Ohio and as Executive Vice
                President -- Administration of United Bancorp, Inc. since
                October 26, 1998.

ITEM 11         EXECUTIVE COMPENSATION

                Refer to Pages 10 - 12 of the Proxy Statement.

ITEM 12         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

                Refer to Pages 3 - 8 of the Proxy Statement.

ITEM 13         CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

                Not Applicable.


                                       13
<PAGE>   14

                         UNITED BANCORP, INC. FORM 10-K

PART IV

ITEM 14         EXHIBITS, FINANCIAL STATEMENTS, SCHEDULES AND REPORTS ON FORM
                8-K

        (a)     DOCUMENTS FILED AS PART OF FORM 10-K

                1.       The following consolidated financial statements appear
                         in the 2000 Annual Report To Shareholders and are
                         incorporated by reference:
<TABLE>

<S>                                                                                            <C>      <C>
                         Report of Independent Auditors                                          Page     33
                         Consolidated Balance Sheets                                             Page     34
                         Consolidated Statements of Income                                       Page     35
                         Consolidated Statements of Shareholders' Equity                         Page     36
                         Consolidated Statements of Cash Flow                                    Page     37
                         Notes to the Consolidated Financial Statements                          Pages    38 - 55
</TABLE>

                2.       The summary of selected quarterly results of operations
                         appears on Page 55 in the 2000 Annual Report To
                         Shareholders and is incorporated by reference.

                3.       Exhibits

                         2            Not Applicable
                         3 (i)(ii)    Articles of Incorporation of United
                                      Bancorp, Inc. including amendments and By
                                      Laws, previously filed with the Securities
                                      and Exchange Commission on November 16,
                                      1983.
                         4            Not applicable.
                         9            Not applicable.
                         10           Reference to special severance agreement
                                      on Page 8 of the Proxy Statement
                         11           Statement regarding computation of per
                                      share earnings (included in Note 1 to the
                                      consolidated financial statements on page
                                      40 and Note 16 on Page 54 of the Annual
                                      Report To Shareholders.)
                         12           Not applicable.
                         13           Reference to the Annual Report To
                                      Shareholders for the fiscal year ended
                                      December 31, 2000.
                         16           Not applicable.
                         18           Not applicable.
                         21.1         Reference to The Citizens Savings Bank,
                                      Martins Ferry, Ohio, incorporated on
                                      December 31, 1902, previously filed with
                                      the Securities and Exchange Commission.
                         21.2         Reference to The Community Bank,
                                      Lancaster, Ohio, incorporated on August 1,
                                      1949, previously filed with the Securities
                                      and Exchange Commission.
                         22           Not applicable.
                         23           Consents of Experts and Council.
                         24           Not applicable.
                         99           Not applicable.

        (b) The Company filed no reports on SEC Form 8-K during the last quarter
of the covered by this report.


                                       14

<PAGE>   15

                         UNITED BANCORP, INC. FORM 10-K

                Pursuant to the requirements of Section 13 or 15(d) of the
                Securities Exchange Act of 1934, the registrant has duly caused
                this report to be signed on its behalf by the undersigned,
                thereunto duly authorized.

                (Registrant) United Bancorp, Inc.

                By:                                               March 24, 2001
                    -------------------------------------------
                    James W. Everson, Chairman, President & CEO



                By:                                               March 24, 2001
                    -------------------------------------------
                    Randall M. Greenwood, CFO



                By:                                               March 24, 2001
                    -------------------------------------------
                    Michael J. Arciello



                By:                                               March 24, 2001
                    -------------------------------------------
                    Terry A. McGhee



                By:                                               March 24, 2001
                    -------------------------------------------
                    John M. Hoopingarner



                By:                                               March 24, 2001
                    -------------------------------------------
                    Richard L. Riesbeck



                By:                                               March 24, 2001
                    -------------------------------------------
                    L.E. Richardson, Jr.



                By:                                               March 24, 2001
                    -------------------------------------------
                    Matthew C. Thomas


                                       15
<PAGE>   16

                         UNITED BANCORP, INC. FORM 10-K

EXHIBIT INDEX

        Exhibit No.       Description                            SK Item 601 No.
        -----------       -----------                            ---------------

               1          Annual Report to Shareholders          13

               2          Consents of Experts and Council        23





                                       16