Mason County, Washington, a core county of the Seattle-Tacoma, WA market, holds $372M in deposits across 4 insured institutions and 6 branches. KeyBank is the largest deposit holder at 33.0% share. The top three banks hold 86% of deposits, which places the county in the Concentrated band. Deposits have fallen 21.1% since 2021 while the branch count fell by 25.0%. It produced $1.9B of real gross domestic product in 2024, ranking #954 of the 1,523 ranked counties by economic output.
Ranks show where the county stands among the 1,523 ranked counties (those within a Combined or Metropolitan Statistical Area that have a branch). They describe relative position, not a rating of market quality or suitability.
Deposit trend
Branches: 8 in 2021 to 6 in 2026. Institutions: 6 to 4. Top-three share: 69% to 86%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| KeyBank | $123M | 33.0% | -20% |
| Heritage Bank | $114M | 30.6% | -8% |
| Columbia Bank | $84M | 22.6% | -17% |
| Olympia Federal Savings and Loan Association | $51M | 13.8% | -4% |
The 4 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, June 30, 2026. Five-year change compares the same institution’s county deposits in 2021 and 2026. Institutions are tracked by FDIC certificate number, and where an institution acquired another bank, the acquired bank’s prior deposits are folded into the baseline so the change reflects the combined, continuing franchise rather than reading as new. “No 2021 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year. Deposit figures are nominal and are not adjusted for inflation.
Part of the Seattle-Tacoma market
Mason County is one of 9 counties that make up the Seattle-Tacoma, WA market, a Combined Statistical Area (ranked #9 of 293 U.S. markets by economic output). It produces 0.3% of the market’s output and holds 0.2% of its deposits.
| Measure | Mason County | Share of parent market |
|---|---|---|
| 2024 GDP | $1.9B | 0.3% |
| Deposits | $372M | 0.2% |
| Population | 71,165 | 1.4% |
View the full Seattle-Tacoma market profile →
Recruiting in Mason County
Deposits are held closely by the largest banks, which often means the bankers worth recruiting are inside a small number of institutions. Who holds the deposits, and how contested the market is, shapes both the runway for growth and the competition you would be recruiting against. We recruit commercial relationship managers, banking teams, and market leaders for banks building in markets like Mason County.
See how we help banks recruit commercial banking talent