Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
ZBACNIK FRANK R
   2. Issuer Name and Ticker or Trading Symbol
WESTAMERICA BANCORPORATION [WABC] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP/Chief Credit Administrator
(Last)
(First)
(Middle)
3. Date of Earliest Transaction (Month/Day/Year)
11/02/2005
(Street)

 		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.6236 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.639 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.66 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.662 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.6913 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.6933 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.7058 35.2012 D  
Common Stock 11/02/2005   M   1,000 A $ 39.4062 1,035.2012 D  
Common Stock 11/02/2005   S   1,000 D $ 53.7186 35.2012 D  
Common Stock 11/02/2005   M   420 A $ 39.4062 455.2012 D  
Common Stock 11/02/2005   S   420 D $ 53.797 35.2012 (3) D  
Common Stock               1,570 I Deferred
Common Stock               10,108.583 (1) I ESOP

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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) 3A. Deemed Execution Date, if any (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)		 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 Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 7,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 6,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 5,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 4,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 3,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 2,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 1,420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     1,000 01/25/2002(2) 01/25/2011 Common Stock 1,000 $ 0 420 D  
Non-Qualified Stock Option (right to buy) $ 39.4062 11/02/2005   M     420 01/25/2002(2) 01/25/2011 Common Stock 420 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
ZBACNIK FRANK R

 		       SVP/Chief Credit Administrator  

Signatures

 by: Frank R. Zbacnik   11/03/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes allocations through 9/30/05 from the latest quarterly report, to Westamerica Bancorporation's Tax Deferred Savings/Retirement (ESOP) Plan.
(2) Options vest ratably over three years beginning one year from grant date.
(3) Includes dividends reinvested through 8/31/05.

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