Ellensburg
- County:
- Kittitas County
- County Seat:
- Yes
- Area (mi²):
- 8.832
- State:
- Washington
Ellensburg is a city located in Kittitas County, Washington. Ellensburg has a 2026 population of 20,996. It is also the county seat of Kittitas County. Ellensburg is currently declining at a rate of -0.54% annually and its population has decreased by -2.92% since the most recent census, which recorded a population of 21,627 in 2020.