Kittitas County's 2026 population is estimated at 48,826, reflecting a 0.67% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Kittitas County is the 24th largest county in Washington. The 2010 population was 40,992 and has grown 19.11% since 2010.
Data after 2023 is projected based on recent change
Overall: 35.8 years
Female: 36 years
Male: 35.7 years
There are 39,300 adults, (8,040 of whom are seniors) in Kittitas County.
Female: 23,500 (49.8%)
Male: 23,672 (50.2%)
The racial composition of Kittitas County includes 82.08% White, 4.89% other race, and smaller percentages for Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 38,721 | 82.08% |
| Two or more races | 4,536 | 9.62% |
| Other race | 2,308 | 4.89% |
| Asian | 813 | 1.72% |
| Black or African American | 532 | 1.13% |
| Native American | 237 | 0.5% |
| Native Hawaiian or Pacific Islander | 25 | 0.05% |
Kittitas County 's average per capita income is $54,670. Household income levels show a median of $73,804. The poverty rate stands at 14.38%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $111,346 | $139,505 |
| Families | $101,809 | $127,100 |
| Households | $73,804 | $102,663 |
| Non Families | $40,400 | $60,464 |
Average Income
Median Household Income
Poverty Rate