Washington Population By County in 2020
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2020, the population of Washington was 7,727,209. Among all Washington counties, King had the highest population (2,274,349), followed by Pierce (923,655), and Snohomish (829,975). Garfield was the least populated county (2,297).
Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.
You can see similar information for other states and by state for the United States.
Related Topics: Washington Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Washington Population By County in 2020
Washington Population By County in 2020
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| County | Population | % of State Population |
|---|---|---|
| Adams | 20609 | 0.27 |
| Asotin | 22328 | 0.29 |
| Benton | 207426 | 2.68 |
| Chelan | 79307 | 1.03 |
| Clallam | 77365 | 1.00 |
| Clark | 505363 | 6.54 |
| Columbia | 3953 | 0.05 |
| Cowlitz | 111021 | 1.44 |
| Douglas | 43032 | 0.56 |
| Ferry | 7197 | 0.09 |
| Franklin | 97152 | 1.26 |
| Garfield | 2297 | 0.03 |
| Grant | 99445 | 1.29 |
| Grays Harbor | 75863 | 0.98 |
| Island | 87007 | 1.13 |
| Jefferson | 33061 | 0.43 |
| King | 2274349 | 29.43 |
| Kitsap | 275832 | 3.57 |
| Kittitas | 46823 | 0.61 |
| Klickitat | 22820 | 0.30 |
| Lewis | 82562 | 1.07 |
| Lincoln | 10927 | 0.14 |
| Mason | 66033 | 0.86 |
| Okanogan | 42147 | 0.55 |
| Pacific | 23492 | 0.30 |
| Pend Oreille | 13506 | 0.18 |
| Pierce | 923655 | 11.95 |
| San Juan | 17826 | 0.23 |
| Skagit | 129901 | 1.68 |
| Skamania | 12045 | 0.16 |
| Snohomish | 829975 | 10.74 |
| Spokane | 541198 | 7.00 |
| Stevens | 46589 | 0.60 |
| Thurston | 296018 | 3.83 |
| Wahkiakum | 4448 | 0.06 |
| Walla Walla | 62629 | 0.81 |
| Whatcom | 227451 | 2.94 |
| Whitman | 47821 | 0.62 |
| Yakima | 256736 | 3.32 |