There are 10 zip codes in Kittitas County, Washington. The most populated is 98926, located in Ellensburg. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
9892632,327Ellensburg
989227,577Cle Elum
989341,033Kittitas
98941827Roslyn
98943715South Cle Elum
98925533Easton
98068528Snoqualmie Pass
98940409Ronald
98946363Thorp
9895054Vantage

Zip Codes in Kittitas County, Washington by Population (2024)