Home > California Banks > Larkspur Banks > Westamerica Bank Larkspur > Westamerica Bank, LARKSPUR-KENTFIELD BRANCH > Routing Numbers
Westamerica Bank Routing Numbers
In our record, Westamerica Bank has a total of 3 routing numbers.
| Routing Number | Process FedACH | Process Fedwire | Location | Registered Name |
| 121140218 | Y | Y | Suisun City, CA | Westamerica Bank |
| 121141000 | Y | N | Suisun City, CA | Westamerica Bank |
| 121141615 | Y | N | Suisun City, CA | Westamerica Bank |
A routing number is a nine digit code, used in the United States to identify the financial institution. Routing numbers are used by Federal Reserve Banks to process Fedwire funds transfers, and ACH(Automated Clearing House) direct deposits, bill payments, and other automated transfers. The routing number can be found on your check.
The routing number information on this page was updated on Mar. 25, 2024
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