Washington Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Washington was 7.62M. Among all Washington counties, King was the most populated county (2.24M), followed by Pierce (910.23K), and then Snohomish (820.02K).
On the other hand, the least populated counties were: Garfield (2.28K), Columbia (3.97K), and Wahkiakum (4.37K).
The chart and table below shows the population of each county and the percentage of Washington population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Washington ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Washington Population By County in 2021
Washington Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adams | 20353 | 0.27 |
| Asotin | 22285 | 0.29 |
| Benton | 204551 | 2.69 |
| Chelan | 78508 | 1.03 |
| Clallam | 76727 | 1.01 |
| Clark | 496494 | 6.52 |
| Columbia | 3969 | 0.05 |
| Cowlitz | 109457 | 1.44 |
| Douglas | 42622 | 0.56 |
| Ferry | 7198 | 0.09 |
| Franklin | 95313 | 1.25 |
| Garfield | 2278 | 0.03 |
| Grant | 97874 | 1.29 |
| Grays Harbor | 74737 | 0.98 |
| Island | 85938 | 1.13 |
| Jefferson | 32590 | 0.43 |
| King | 2240876 | 29.42 |
| Kitsap | 273072 | 3.59 |
| Kittitas | 44147 | 0.58 |
| Klickitat | 22478 | 0.30 |
| Lewis | 81214 | 1.07 |
| Lincoln | 10798 | 0.14 |
| Mason | 64964 | 0.85 |
| Okanogan | 41966 | 0.55 |
| Pacific | 22974 | 0.30 |
| Pend Oreille | 13302 | 0.18 |
| Pierce | 910225 | 11.95 |
| San Juan | 17631 | 0.23 |
| Skagit | 128228 | 1.68 |
| Skamania | 11973 | 0.16 |
| Snohomish | 820024 | 10.77 |
| Spokane | 531477 | 6.98 |
| Stevens | 46057 | 0.61 |
| Thurston | 290642 | 3.82 |
| Wahkiakum | 4373 | 0.06 |
| Walla Walla | 62168 | 0.82 |
| Whatcom | 224533 | 2.95 |
| Whitman | 48197 | 0.63 |
| Yakima | 255151 | 3.35 |