Exhibit 21

WESTAMERICA BANCORPORATION

Subsidiaries as of December 31, 2004

	State of
	Incorporation
Westamerica Bank		California
Westamerica Mortgage Company — a subsidiary of Westamerica Bank		California
Community Banker Services Corporation		California
Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation		California
The Money Outlet, Inc.		California
Westamerica Commercial Credit, Inc.		California