Banks in Mason County, Washington
6 active bank branches operated by 4 institutions, per FDIC records.
Active branches
6
Banks present
4
Deposits (2025)
$376M
Closings since 2020
2
0 openings
Largest banks by deposits in Mason County (2025)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| KeyBank | $125M | 33.2% | 2 |
| Heritage Bank | $123M | 32.7% | 2 |
| Columbia Bank | $79M | 21.1% | 1 |
| Olympia Federal Savings and Loan Association | $49M | 13% | 1 |
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.