Banks in Mason County, Washington
6 active bank branches operated by 4 institutions, per FDIC records.
Active branches
6
Banks present
4
Deposits (2026)
$372M
Closings since 2020
2
0 openings
Largest banks by deposits in Mason County (2026)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| KeyBank | $123M | 33% | 2 |
| Heritage Bank | $114M | 30.6% | 2 |
| Columbia Bank | $84M | 22.6% | 1 |
| Olympia Federal Savings and Loan Association | $51M | 13.8% | 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.