Westamerica Bank, Petaluma Branch Basic Info Reviews Routing Numbers Map & Direction Name: Westamerica Bank, Petaluma Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 200 Washington Street Petaluma, California 94952 Sonoma County View other branches Phone: 707-769-5500 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121137001YN121140218YY121141000YN121141615YN From: To:
