Westamerica Bank, Benicia Branch Basic Info Reviews Routing Numbers Map & Direction Name: Westamerica Bank, Benicia Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 20 Solano Square Benicia, California 94510 Solano County View other branches Phone: 707-747-3480 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121137001YN121140218YY121141000YN121141615YN From: To: