# Counties in Washington by population density, 2025

All 39 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_density`
- Unit: inhabitants per km²
- Definition: Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.
- Source: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km² (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-09
- Citation: U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.
- Web page: https://invokely.ai/rankings/population-density/washington-counties
- CSV: https://invokely.ai/download/rankings/population-density/washington-counties.csv

| Rank | Place | inhabitants per km² |
|---:|---|---:|
| 1 | King County | 427.9 |
| 2 | Clark County | 326.9 |
| 3 | Kitsap County | 276.9 |
| 4 | Pierce County | 219 |
| 5 | Thurston County | 162.6 |
| 6 | Snohomish County | 161.1 |
| 7 | Island County | 158.5 |
| 8 | Spokane County | 122.2 |
| 9 | Benton County | 50.4 |
| 10 | Whatcom County | 43.3 |
| 11 | San Juan County | 41.2 |
| 12 | Cowlitz County | 38.9 |
| 13 | Franklin County | 31.9 |
| 14 | Skagit County | 29.7 |
| 15 | Mason County | 28.6 |
| 16 | Yakima County | 23.3 |
| 17 | Walla Walla County | 19 |
| 18 | Clallam County | 17.4 |
| 19 | Grays Harbor County | 15.9 |
| 20 | Grant County | 15.2 |
| 21 | Lewis County | 14.2 |
| 22 | Asotin County | 13.7 |
| 23 | Chelan County | 10.8 |
| 24 | Pacific County | 10.1 |
| 25 | Douglas County | 9.9 |
| 26 | Whitman County | 8.7 |
| 27 | Kittitas County | 8.2 |
| 28 | Stevens County | 7.7 |
| 29 | Jefferson County | 7.3 |
| 30 | Wahkiakum County | 7.2 |
| 31 | Klickitat County | 5 |
| 32 | Adams County | 4.3 |
| 33 | Pend Oreille County | 4 |
| 34 | Okanogan County | 3.3 |
| 35 | Skamania County | 3 |
| 36 | Lincoln County | 2 |
| 37 | Columbia County | 1.8 |
| 38 | Ferry County | 1.3 |
| 39 | Garfield County | 1.3 |