Westamerica Bank ← View details 18615 California 12, Sonoma, CA 95476 +1 707-939-7300 westamerica.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 12:00 pm — 04:00 pm Tuesday: 12:00 pm — 04:00 pm Wednesday: 12:00 pm — 04:00 pm Thursday: 12:00 pm — 04:00 pm Friday: 12:00 pm — 06:00 pm Your comments * — Required information