10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 98926 | Ellensburg | 32,327 |
| 98922 | Cle Elum | 7,577 |
| 98934 | Kittitas | 1,033 |
| 98941 | Roslyn | 827 |
| 98943 | South Cle Elum | 715 |
| 98925 | Easton | 533 |
| 98068 | Snoqualmie Pass | 528 |
| 98940 | Ronald | 409 |
| 98946 | Thorp | 363 |
| 98950 | Vantage | 54 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Kittitas County, Washington (US Census).