Washington Counties by Population (2026)
2026 Pop.
200K
400K
600K
800K
1M
1.2M
1.4M
1.6M
1.8M
2M
2.2M
2.4M
Top 5 Most Populous Counties
2,427,007
960,074
891,745
562,325
536,873
| County | 2026 Pop. ↓ | Area (mi²) | Density (/mi²) | Change (2020) |
|---|---|---|---|---|
| King County | 2,427,007 | 2.1K | 1,147 | 6.71% |
| Pierce County | 960,074 | 1.7K | 576 | 3.94% |
| Snohomish County | 891,745 | 2.1K | 427 | 7.44% |
| Spokane County | 562,325 | 1.8K | 319 | 3.9% |
| Clark County | 536,873 | 628 | 855 | 6.24% |
| Thurston County | 309,698 | 723 | 428 | 4.62% |
| Kitsap County | 288,960 | 395 | 732 | 4.76% |
| Yakima County | 261,183 | 4.3K | 61 | 1.73% |
| Whatcom County | 239,490 | 2.1K | 114 | 5.29% |
| Benton County | 223,680 | 1.7K | 132 | 7.84% |
| Skagit County | 134,700 | 1.7K | 78 | 3.69% |
| Cowlitz County | 115,866 | 1.1K | 102 | 4.36% |
| Grant County | 107,975 | 2.7K | 40 | 8.58% |
| Franklin County | 104,606 | 1.2K | 84 | 7.67% |
| Lewis County | 88,619 | 2.4K | 37 | 7.34% |
| Island County | 86,696 | 208 | 417 | -0.36% |
| Chelan County | 82,806 | 2.9K | 28 | 4.41% |
| Clallam County | 78,696 | 1.7K | 45 | 1.72% |
| Grays Harbor County | 78,539 | 1.9K | 41 | 3.53% |
| Mason County | 71,388 | 960 | 74 | 8.11% |
| Walla Walla County | 62,626 | 1.3K | 49 | 0% |
| Whitman County | 49,397 | 2.2K | 23 | 3.3% |
| Stevens County | 49,369 | 2.5K | 20 | 5.97% |
| Kittitas County | 48,826 | 2.3K | 21 | 4.28% |
| Douglas County | 47,365 | 1.8K | 26 | 10.07% |
| Okanogan County | 46,830 | 5.3K | 8.9 | 11.11% |
| Jefferson County | 34,382 | 1.8K | 19 | 4% |
| Klickitat County | 24,996 | 1.9K | 13 | 9.54% |
| Pacific County | 24,389 | 933 | 26 | 3.82% |
| Asotin County | 22,549 | 636 | 35 | 0.99% |
| Adams County | 21,403 | 1.9K | 11 | 3.85% |
| San Juan County | 18,794 | 174 | 108 | 5.43% |
| Pend Oreille County | 14,272 | 1.4K | 10 | 5.67% |
| Skamania County | 12,702 | 1.7K | 7.7 | 5.45% |
| Lincoln County | 12,066 | 2.3K | 5.2 | 10.42% |
| Ferry County | 7,685 | 2.2K | 3.5 | 6.78% |
| Wahkiakum County | 4,866 | 263 | 19 | 9.4% |
| Columbia County | 3,965 | 869 | 4.6 | 0.3% |
| Garfield County | 2,492 | 711 | 3.5 | 8.49% |
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)