Westamerica Bank, Suisun City Branch Basic Info Reviews Routing Numbers Map & Direction Name: Westamerica Bank, Suisun City Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 333 Sunset Avenue, Suite 100 Suisun City, California 94585 Solano County View other branches Phone: 707-429-7400 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121137001YN121140218YY121141000YN121141615YN From: To: