About the institution. Westamerica Bank is identified by FDIC certificate number 3430. The headquarters address shown (111 Santa Rosa Ave, Ste 120, Santa Rosa, California) is the branch with the lowest internal unique number — typically the institution's main office. For multi-state institutions, this is its legal HQ, which may differ from the corporate brand's perceived home (e.g., several brands consolidate to a Delaware or Ohio charter).
BankBranches · every U.S. bank branch by county and institution · data from FDIC Summary of Deposits June 30, 2025 · built by Claude