Prepared by MERRILL CORPORATION

    FORM 4

/ / Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

(Print or Type Responses)
  UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF
CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
Section 17(a) of the Public Utility Holding Company Act of 1935 or
Section 30(f) of the Investment Company Act of 1940
 
OMB APPROVAL

OMB Number:  3235-0287
Expires: December 31, 2001
Estimated average burden hours per response .... 0.5


1.   Name and Address of Reporting Person*   2.   Issuer Name and Ticker or Trading Symbol   6.   Relationship of Reporting Person(s) to Issuer (Check all applicable)
    Munoz   Mike           United Security Bancshares UBFO        X  Director       10% Owner

 
           
    (Last)   (First)   (Middle)   3.   I.R.S. Identification Number of Reporting Person (voluntary)   4.   Statement for Month/Year            Officer
    (give title below)
       Other
    (specify below)
                    December 2001            

 
 
     
(Street)           5.   If Amendment, Date of Original (Month/Year)   7.   Individual or Joint/Group Filing
(Check Applicable Line)
     Form filed by One Reporting Person
     Form filed by More than
                                    One Reporting Person

    (City)   (State)   (Zip)                            
                Table I — Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.   Title of Security
(Instr. 3)
  2.   Transaction Date   3.   Transaction Code
(Instr. 8)
  4.   Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
  5.   Amount of Securities Beneficially Owned at End of Month   6.   Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
  7.   Nature of Indirect Beneficial Ownership
(Instr. 4)
            (Month/ Day/ Year)  
      (Instr. 3 and 4)                
                    Code   V       Amount   (A) or (D)   Price                        

    Common Stock   12/31/01       K           5,000   D   $16.50   17,432            

                                                                 

                                                                 

                                                                 

                                                                 

                                                                 

                                                                 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.   (Over)
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).   SEC 1474 (7-97)

POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION
CONTAINED IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM
DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.


FORM 4 (Continued)   Table II — Derivative Securities Acquired, Disposed of, or Beneficially Owned
(
e.g., puts, calls, warrants, options, convertible securities)

1.   Title of Derivative Security
(Instr. 3)
  2.   Conversion or Exercise Price of Derivative Security   3.   Transaction Date
(Month/Day/Year)
  4.   Transaction Code
(Instr. 8)
  5.   Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
  6.   Date Exercisable and Expiration Date (Month/Day/Year)
                       
 
                            Code   V       (A)   (D)       Date
Exercisable
  Expiration Date

Director Stock Option (Right to Buy)                                                    

                                                         

                                                         

                                                         

                                                         

                                                         

                                                         

                                                         

                                                         

                                                         

                                                         


7.   Title and Amount of Underlying Securities
(Instr. 3 and 4)
  8.   Price of Derivative Security
(Instr. 5)
  9.   Number of Derivative Securities Beneficially Owned at End of Month
(Instr. 4)
  10.   Ownership Form of Derivative Securities Beneficially Owned at End of Month (Instr. 4)   11.   Nature of Indirect Beneficial Ownership
(Instr. 4)
   
                               
    Title   Amount or Number of Shares                                


                                         

                                         

                                         

                                         

                                         

                                         

                                         

                                         

                                         

                                         

Explanation of Responses:

    /s/ Mike Munoz   01/07/2002
**Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).  
**Signature of Reporting Person
 
Date
         
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.        
         
        Page 2
SEC 1474 (7-97)