Westamerica Bank

Annual Report Copies

Westamerica Bancorporation will provide its security holders, without charge, a copy of its 2010 Annual Report on Form 10-K, including the financial statements and schedules thereto, as filed with the Securities and Exchange Commission. Requests for copies of this annual report should be directed to:

Westamerica Bancorporation
Investor Relations, A-2B
Post Office Box 1250, Suisun City, CA 94585-1250
Telephone (707) 863-6992, E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
www.westamerica.com

Dividend Reinvestment

Westamerica Bancorporation offers a dividend reinvestment program whereby registered shareholders may reinvest their dividends in shares of the Company. Information concerning this optional program is available from:

Computershare Investor Services LLC
Telephone (877) 588-4258 (Toll-free)

Notice of Annual Meeting

The Westamerica Bancorporation Annual Meeting will be held on Thursday, April 26, 2012 at
11:00 a.m., at the Fairfield Center for Creative Arts, Fairfield, California 94533.

Stock Listing

The NASDAQ Stock Market, Symbol: WABC
Approximately 8,000 Shareholders of record at December 31, 2009.

Transfer Agent

Computershare Investor Services LLC
Telephone (877) 588-4258 (Toll-free)
www.computershare.com/investor