| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 98068 | Snoqualmie Pass | Kittitas County | PO Box |
| 98922 | Cle Elum | Kittitas County | Standard |
| 98925 | Easton | Kittitas County | PO Box |
| 98926 | Ellensburg | Kittitas County | Standard |
| 98934 | Kittitas | Kittitas County | PO Box |
| 98940 | Ronald | Kittitas County | PO Box |
| 98941 | Roslyn | Kittitas County | PO Box |
| 98943 | South Cle Elum | Kittitas County | PO Box |
| 98946 | Thorp | Kittitas County | Standard |
| 98950 | Vantage | Kittitas County | PO Box |