King County's 2026 population is estimated at 2,427,007, reflecting a 1.82% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). King County is the largest county in Washington. The 2010 population was 1,938,431 and has grown 25.2% since 2010.
Data after 2023 is projected based on recent change
Overall: 37.4 years
Female: 38 years
Male: 36.8 years
There are 1,841,577 adults, (320,899 of whom are seniors) in King County.
Female: 1,127,866 (49.3%)
Male: 1,159,305 (50.7%)
The racial composition of King County includes 54.7% White, 20.67% Asian, 6.56% Black or African American, 5.04% other race, and smaller percentages for Native Hawaiian or Pacific Islander, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 1,251,054 | 54.7% |
| Asian | 472,849 | 20.67% |
| Two or more races | 266,129 | 11.64% |
| Black or African American | 149,956 | 6.56% |
| Other race | 115,259 | 5.04% |
| Native Hawaiian or Pacific Islander | 17,249 | 0.75% |
| Native American | 14,675 | 0.64% |
King County 's average per capita income is $79,039. Household income levels show a median of $124,746. The poverty rate stands at 8.59%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $187,574 | $243,085 |
| Families | $160,840 | $217,293 |
| Households | $124,746 | $176,799 |
| Non Families | $82,396 | $116,471 |
Average Income
Median Household Income
Poverty Rate