Founded in 1883, Kittitas County is one of 39 counties in the state of Washington. Historically, Kittitas County was formed from Yakima County. The city of Ellensburg is the county seat. With FIPS code of 37, Kittitas County has a population of 44,337 and area of 2,297 square miles (5,949 km2).
List of all cities in Kittitas County, WA alphabetically
| 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 |