Westamerica Bank, Sonoma Main Basic Info Reviews Routing Numbers Map & Direction Name: Westamerica Bank, Sonoma Main Main Office: No Service: Full Service Brick and Mortar Office Location: 202 West Napa Street Sonoma, California 95476 Sonoma County View other branches Phone: 707-935-3200 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121137001YN121140218YY121141000YN121141615YN From: To:
