Westamerica Bank, Sebastopol Branch Basic Info Reviews Routing Numbers Map & Direction Name: Westamerica Bank, Sebastopol Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 105 North Main Street Sebastopol, California 95472 Sonoma County View other branches Phone: 707-823-7841 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121137001YN121140218YY121141000YN121141615YN From: To:
