United States · ACH / ABA
Westamerica Bank routing number
Find ACH / ABA routing numbers for WESTAMERICA BANK. Primary routing number 121140218 (SUISUN CITY, CA). Confirm on your check or statement, then send with Glide.
Sending this money abroad? Compare it against an international wire from Westamerica Bank. Compare transfer costs →
Primary routing number
121140218 breaks down as 1211 for fed, 4021 for bank, 8 for check.
SUISUN CITY, CA — this is the leftmost 9-digit number on the bottom of a Westamerica Bank check.
Routing number details
- Bank
- WESTAMERICA BANK
- Routing number
- 121140218
- City
- SUISUN CITY
- State
- CA
- Numbers listed
- 3
- Used for
- ACH · direct deposit · bill pay
- On a check
- Bottom-left, 9 digits
- ABA checksum
- Valid
All Westamerica Bank routing numbers3
US & international payments
Banking with Westamerica Bank?
Hold 80+ currencies, spend on a Visa card and move money abroad — alongside the account you already have at Westamerica Bank. Conversions are quoted at the mid-market rate, with the cost charged as a visible fee rather than buried in the rate.