How many people live in King County, WA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 2.34 million people living in King County, WA. That makes King County the 12th-most populous county in the US. It is also the largest in Washington, accounting for 29.2% of the state’s population.
2.34M
population of King County, WA (2024)
29.2%
County share of the Washington population (2024)
About 2.34 million people lived in King County, WA in 2024.
Population estimates, 2000–2024
What are King County, WA’s age demographics?
About 340,900 King County, WA residents are aged 65 and older in 2024. That represents 14.6% of its population. For comparison, the age group represents 17.4% of Washington’s population and 18% in the US overall.
Another 441,400 King County residents, or 18.9% 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 King County, WA's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are King County, WA’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 23.1% of the King County, WA population, higher than the national share of 6.5%. King County, WA also has a larger share of people identifying as non-Hispanic two or more races (4.9%) than the US overall (2.5%).
In contrast, King County’s Hispanic population accounts for 11.4%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 7% of the county, compared with 12.6% 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.
King County, WA has a higher share of a non-Hispanic Asian population than Washington as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in King County, WA is Seattle with about 781,000 residents in 2024.
Cities and towns in King County, WA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Seattle | 780,995 |
| 2. | Bellevue | 154,377 |
| 3. | Kent | 136,588 |
| 4. | Renton | 105,543 |
| 5. | Federal Way | 100,252 |
| 6. | Kirkland | 95,499 |
| 7. | Redmond | 82,195 |
| 8. | Auburn (pt.) | 75,813 |
| 9. | Sammamish | 66,474 |
| 10. | Shoreline | 66,251 |
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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.
