<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K/A

                                 Amendment No. 1

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

For the fiscal year ended                            Commission File No. 2-78572
   December 31, 2001

                     UNITED BANCORPORATION OF ALABAMA, INC.
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


          Delaware                                             63-0833573
----------------------------                             --------------------
(State or other jurisdiction                               (I.R.S. Employer
   of incorporation or                                   Identification  No.)
      organization)

                      P.O. Drawer 8, Atmore, Alabama 36504
                    ----------------------------------------
                    (Address of principal executive offices)

Registrant's telephone number, including area code: (251) 368-2525

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act:

                 Class A Common Stock, Par Value $.01 Per Share

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Sections 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. [ ]

Aggregate market value of voting stock held by nonaffiliates as of March 11,
2002 was $33,225,148 based upon the price reported to the registrant at which
the stock was sold on that date and using beneficial ownership of stock rules
adopted pursuant to Section 13 of the Securities Exchange Act of 1934 to exclude
voting stock owned by directors and executive officers, some of whom might not
be held to be affiliates upon judicial determination.


<PAGE>

Indicate the number of shares outstanding of each of the registrant's classes of
common stock, as of the latest practicable date.

<Table>
<Caption>
Common Stock        Par Value                        Outstanding at May 3, 2000
------------        ---------                        --------------------------
<S>                 <C>                              <C>

Class A..........     $.01                                 1,098,352 Shares*
Class B..........     $.01                                         0 Shares
</Table>


*Excludes 61,929 shares held as treasury stock.



<PAGE>

This Amendment No. 1 amends in its entirety Item 14 of the registrant's Form
10-K for the fiscal year ended December 31, 2001, filed on April 1, 2002.


<PAGE>

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

(a)      (1)      The financial statements listed in the Index to Financial
                  Statements contained in Item 8 hereof are filed as part of
                  this Annual Report on Form 10-K.

         (2)      Financial statement schedules have been omitted as
                  inapplicable.

         (3)      The Exhibits listed below are filed as part of this Report.
                  Management contracts and compensatory plans and arrangements
                  required to be filed pursuant to Item 14(c) are identified by
                  an asterisk (*).

         3.1      Restated Certificate of Incorporation of the Registrant
                  (Incorporated by reference herein from Exhibit 3a to the
                  Registrant's Annual Report on Form 10-K for the fiscal year
                  ended December 31, 1988).

         3.1.1    Certificate of Amendment to Restated Certificate of
                  Incorporation Of the Registrant (Incorporated by reference
                  herein from Exhibit 3.1.1 to Registrant's Quarterly Report on
                  Form 10-Q for the Quarter Ended March 31, 1999).

         3.2      Amended and Restated Bylaws of the Registrant (Incorporated by
                  reference herein from Exhibit 3.2 to the Registrant's Annual
                  Report on Form 10-K for the fiscal year ended December 31,
                  1992).

         10.1     Form of Employment Agreement between United Bank and Robert R.
                  Jones, III (Incorporated by reference herein from Exhibit 10.1
                  to the Registrant's Annual Report on Form 10-K for the fiscal
                  year ended December 31, 1997.*

         10.2     Supplement to Employment Agreement between United Bank and
                  Robert R. Jones III, joined by the Registrant (Incorporated by
                  reference herein from Exhibit 10.2 to the Registrant's Annual
                  Report on form 10-K for the fiscal year ended December 31,
                  1998).*

         10.3     1998 Stock Option Plan of United Bancorporation of Alabama,
                  Inc. (Incorporated by reference herein from Exhibit 3.1.1 to
                  Registrant's Quarterly Report on Form 10-Q for the Quarter
                  Ended March 31, 1999).

         10.4     1999 Employee Stock Purchase Plan of United Bancorporation of
                  Alabama, Inc. (incorporated herein by reference from appendix
                  A to the Registrant's definitive proxy statement dated April
                  10, 2000).*

         10.5     Supplemental Compensation and Amendment Agreement between
                  United Bank and Robert R. Jones, III.*

         21       Subsidiaries of the Registrant.


<PAGE>

                                   SIGNATURE

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.

                                UNITED BANCORPORATION OF ALABAMA, INC.
                                (Registrant)

                                BY: /s/ Mitchell D. Staples
                                   --------------------------------------------
                                    Mitchell D. Staples
                                    Treasurer and Chief Financial Officer

Date:  April 9, 2002


<PAGE>


                               INDEX TO EXHIBITS

<Table>
<Caption>
EXHIBIT
NUMBER       DESCRIPTION
-------      -----------
<S>          <C>

(a) (1)      The financial statements listed in the Index to Financial
             Statements contained in Item 8 hereof are filed as part of
             this Annual Report on Form 10-K.

    (2)      Financial statement schedules have been omitted as
             inapplicable.

    (3)      The Exhibits listed below are filed as part of this Report.
             Management contracts and compensatory plans and arrangements
             required to be filed pursuant to Item 14(c) are identified by
             an asterisk (*).

    3.1      Restated Certificate of Incorporation of the Registrant
             (Incorporated by reference herein from Exhibit 3a to the
             Registrant's Annual Report on Form 10-K for the fiscal year
             ended December 31, 1988).

    3.1.1    Certificate of Amendment to Restated Certificate of
             Incorporation Of the Registrant (Incorporated by reference
             herein from Exhibit 3.1.1 to Registrant's Quarterly Report on
             Form 10-Q for the Quarter Ended March 31, 1999).

    3.2      Amended and Restated Bylaws of the Registrant (Incorporated by
             reference herein from Exhibit 3.2 to the Registrant's Annual
             Report on Form 10-K for the fiscal year ended December 31,
             1992).

    10.1     Form of Employment Agreement between United Bank and Robert R.
             Jones, III (Incorporated by reference herein from Exhibit 10.1
             to the Registrant's Annual Report on Form 10-K for the fiscal
             year ended December 31, 1997.*

    10.2     Supplement to Employment Agreement between United Bank and
             Robert R. Jones III, joined by the Registrant (Incorporated by
             reference herein from Exhibit 10.2 to the Registrant's Annual
             Report on form 10-K for the fiscal year ended December 31,
             1998).*

    10.3     1998 Stock Option Plan of United Bancorporation of Alabama,
             Inc. (Incorporated by reference herein from Exhibit 3.1.1 to
             Registrant's Quarterly Report on Form 10-Q for the Quarter
             Ended March 31, 1999).

    10.4     1999 Employee Stock Purchase Plan of United Bancorporation of
             Alabama, Inc. (incorporated herein by reference from appendix
             A to the Registrant's definitive proxy statement dated April
             10, 2000).*

    10.5     Supplemental Compensation and Amendment Agreement between
             United Bank and Robert R. Jones, III.*

    21       Subsidiaries of the Registrant.
</Table>