Washington Counties by Population (2026)
by Kristen Carney
Updated: February 9, 2026
The most populous counties in Washington are King County with 2,287,171, Pierce County at 930,319, Snohomish County with 844,430, Spokane County at 549,056, and Clark County with 516,959. You can get the most current Census population data for all 39 Washington counties, sorted from the most populous counties in Washington to the least, according to the 2024 American Community Survey.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Washington counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | King County | 2,287,171 |
| 2 | Pierce County | 930,319 |
| 3 | Snohomish County | 844,430 |
| 4 | Spokane County | 549,056 |
| 5 | Clark County | 516,959 |
| 6 | Thurston County | 299,067 |
| 7 | Kitsap County | 277,881 |
| 8 | Yakima County | 257,152 |
| 9 | Whatcom County | 230,503 |
| 10 | Benton County | 212,905 |
| 11 | Skagit County | 131,328 |
| 12 | Cowlitz County | 112,360 |
| 13 | Grant County | 101,799 |
| 14 | Franklin County | 98,902 |
| 15 | Island County | 86,836 |
| 16 | Lewis County | 85,154 |
| 17 | Chelan County | 80,172 |
| 18 | Clallam County | 77,813 |
| 19 | Grays Harbor County | 77,053 |
| 20 | Mason County | 67,982 |
| 21 | Walla Walla County | 62,161 |
| 22 | Stevens County | 48,067 |
| 23 | Kittitas County | 47,172 |
| 24 | Whitman County | 47,003 |
| 25 | Douglas County | 44,366 |
| 26 | Okanogan County | 43,425 |
| 27 | Jefferson County | 33,577 |
| 28 | Pacific County | 23,994 |
| 29 | Klickitat County | 23,411 |
| 30 | Asotin County | 22,467 |
| 31 | Adams County | 20,800 |
| 32 | San Juan County | 18,478 |
| 33 | Pend Oreille County | 14,050 |
| 34 | Skamania County | 12,402 |
| 35 | Lincoln County | 11,489 |
| 36 | Ferry County | 7,387 |
| 37 | Wahkiakum County | 4,658 |
| 38 | Columbia County | 4,014 |
| 39 | Garfield County | 2,353 |
|
United States Census Bureau. B01001 SEX BY AGE, 2024 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. January 29, 2026. http://www.census.gov/. |
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