Banks in Sonoma County, California
96 active bank branches operated by 17 institutions, per FDIC records.
Active branches
96
Banks present
17
Deposits (2026)
$19.6B
Closings since 2020
29
7 openings
Largest banks by deposits in Sonoma County (2026)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| Wells Fargo | $4.8B | 24.6% | 11 |
| Poppy Bank | $3.5B | 17.8% | 6 |
| Exchange Bank | $2.7B | 13.8% | 18 |
| Chase Bank | $2.3B | 11.9% | 13 |
| Bank of America | $2.0B | 10% | 7 |
| WaFd Bank | $1.1B | 5.7% | 2 |
| Summit State Bank | $846M | 4.3% | 4 |
| Westamerica Bank | $651M | 3.3% | 9 |
| BMO Bank | $528M | 2.7% | 8 |
| U.S. Bank | $398M | 2% | 3 |
Deposit location reflects the office to which deposits are reported and may not represent the residence of depositors.
Cities and towns
Transcribed from FDIC BankFind Suite active-location records and the annual Summary of Deposits. County assignment follows the FDIC branch record.