10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 98926 | Ellensburg | 34,353 |
| 98922 | Cle Elum | 7,688 |
| 98941 | Roslyn | 1,076 |
| 98940 | Ronald | 858 |
| 98925 | Easton | 850 |
| 98934 | Kittitas | 775 |
| 98943 | South Cle Elum | 579 |
| 98068 | Snoqualmie Pass | 482 |
| 98946 | Thorp | 398 |
| 98950 | Vantage | 61 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Kittitas County, Washington (US Census).