How many people live in Kittitas County, WA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 48,200 people living in Kittitas County, WA. That makes Kittitas County the 24th-most populous county in Washington. It is home to 0.6% of people living in the state.
48.2K
population of Kittitas County, WA (2024)
0.6%
County share of the Washington population (2024)
About 48,200 people lived in Kittitas County, WA in 2024.
Population estimates, 2000–2024
What are Kittitas County, WA’s age demographics?
About 9,200 Kittitas County, WA residents are aged 65 and older in 2024. That represents 19% of its population. For comparison, the age group represents 17.4% of Washington’s population and 18% in the US overall.
Another 8,000 Kittitas County residents, or 16.7% of the population, were children under 18. For comparison, the age group represents 20.9% of Washington’s population and 21.6% in the US overall.
A higher share of Kittitas County, WA's population is aged 18–24 than the US as a whole.
Population estimates by age group, (2024)
What are Kittitas County, WA’s racial and ethnic demographics?
Non-Hispanic white residents make up 81.6% of the Kittitas County, WA population, higher than the national share of 57.5%. Kittitas County also has a larger share of people identifying as non-Hispanic two or more races (3.1%) than the US overall (2.5%).
In contrast, Kittitas County’s non-Hispanic Black or African American population accounts for 1%, below the 12.6% nationwide, and the Hispanic population makes up 10.9% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Kittitas County, WA has a higher share of a non-Hispanic white population than Washington as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Kittitas County, WA is Ellensburg with about 21,000 residents in 2024.
Cities and towns in Kittitas County, WA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Ellensburg | 20,996 |
| 2. | Cle Elum | 2,276 |
| 3. | Kittitas | 1,445 |
| 4. | Roslyn | 960 |
| 5. | South Cle Elum | 572 |
| 6. | Balance of Kittitas County | 21,923 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
