| Locality | Post Code |
|---|---|
| Allyn, Mason | 98524 |
| Belfair, Mason | 98528 |
| Cushman Dam, Mason | 98548 |
| Eldon, Mason | 98555 |
| Grapeview, Mason | 98546 |
| Harstine, Mason | 98584 |
| Hoodsport, Mason | 98548 |
| Kamilche, Mason | 98584 |
| Lilliwaup, Mason | 98555 |
| Matlock, Mason | 98560 |
| Shelton, Mason | 98584 |
| Skokomish, Mason | 98584 |
| Skokomish Nation, Mason | 98584 |
| Tahuya, Mason | 98588 |
| Union, Mason | 98592 |