| City/Town | Postal Code | Area Code |
| Alpental, WA | 98068 | 425/564 |
| Cle Elum, WA | 98922 | 509 |
| Doris, WA | 98950 | 509 |
| Easton, WA | 98925 | 509 |
| Ellensburg, WA | 98926 | 509 |
| 98950 | 509 | |
| Hyak, WA | 98068 | 425/564 |
| Kittitas, WA | 98934 | 509 |
| Liberty, WA | 98922 | 509 |
| North Bend, WA | 98068 | 425/564 |
| Rocklyn, WA | 98941 | 509 |
| Ronald, WA | 98940 | 509 |
| Roslyn, WA | 98941 | 509 |
| Snoqualmie, WA | 98068 | 425/564 |
| Snoqualmie Pass, WA | 98068 | 425/564 |
| South Cle Elum, WA | 98943 | 509 |
| Suncadia, WA | 98922 | 509 |
| Teanaway, WA | 98922 | 509 |
| Thorp, WA | 98946 | 509 |
| Thrali, WA | 98926 | 509 |
| Vantage, WA | 98950 | 509 |