7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Shelton | 1 | 11,052 | 10,437 | 1.13% | 1,900 | 5.82 | City |
| Belfair | 2 | 4,236 | 4,557 | 0.47% | 575 | 7.37 | CDP |
| Allyn | 3 | 2,321 | 2,504 | 1.04% | 1,453 | 1.60 | CDP |
| Grapeview | 4 | 1,172 | 703 | 1.3% | 319 | 3.67 | CDP |
| Skokomish | 5 | 651 | 635 | 0.46% | 98 | 6.67 | CDP |
| Union | 6 | 350 | 327 | -4.89% | 216 | 1.62 | CDP |
| Hoodsport | 7 | 108 | 139 | -14.29% | 102 | 1.05 | CDP |
Shelton is the largest city in Mason County, with a population of 11,052.
Hoodsport is the smallest city in Mason County.
There are 7 cities in Mason County, Washington.