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EXHIBIT 12.1
Westamerica Bancorporation
Computation of Ratio of Earnings to Fixed Charges
                                         
    For the years Ended December 31,
    2008     2007     2006     2005     2004  
Income before taxes
  $ 69,709     $ 120,467     $ 134,425     $ 147,932     $ 132,363  
Fixed charges:
                                       
Interest expense paid on short-term debt
    9,958       32,393       29,389       18,941       6,775  
Interest expense paid on long-term debt
    2,103       2,313       2,332       2,344       1,284  
Interest within rental expense
    0       0       0       0       0  
     
Fixed charges excluding interest expense paid on deposits
  $ 12,061     $ 34,706     $ 31,721     $ 21,285     $ 8,059  
Interest expense paid on deposits
    21,182       37,849       33,547       22,364       13,047  
     
Total fixed charges
  $ 33,243     $ 72,555     $ 65,268     $ 43,649     $ 21,106  
     
Earnings
  $ 102,952     $ 193,022     $ 199,693     $ 191,581     $ 153,469  
     
Earnings excluding interest on deposits
  $ 81,770     $ 155,173     $ 166,146     $ 169,217     $ 140,422