Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ellensburg | 1 | 18,463 | 19,385 | -1.24% | 2,219 | 8.3 | City |
| Terrace Heights | 2 | 10,255 | 8,917 | 2.37% | 975 | 10.5 | CDP |
| Union Gap | 3 | 6,402 | 6,549 | -0.57% | 1,148 | 5.6 | City |
| Cle Elum | 4 | 2,222 | 2,178 | 0.5% | 495 | 4.5 | City |
| Kittitas | 5 | 1,437 | 1,444 | -0.14% | 1,840 | 0.8 | City |
| Roslyn | 6 | 952 | 958 | -0.21% | 217 | 4.4 | City |
| South Cle Elum | 7 | 555 | 559 | -0.18% | 1,381 | 0.4 | Town |
| Snoqualmie Pass | 8 | 438 | 395 | 2.1% | 150 | 2.9 | CDP |
| Easton | 9 | 303 | 302 | -4.11% | 94 | 3.2 | CDP |
| Ronald | 10 | 242 | 202 | -1.63% | 261 | 0.9 | CDP |
| Thorp | 11 | 65 | 109 | -16.67% | 53 | 1.2 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Ellensburg is the largest city in Kittitas County.
Thorp is the smallest city in Kittitas County.
There are 11 cities in Kittitas County, Washington.