Ranking of Washington Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Washington, King County had the highest voting-age population (18 years and over) (1.81M), followed by Pierce County (709.37K), and Snohomish County (639.80K).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Washington counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Washington Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Washington Counties By Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | King County | 1813470 |
| 2 | Pierce County | 709366 |
| 3 | Snohomish County | 639797 |
| 4 | Spokane County | 421551 |
| 5 | Clark County | 385835 |
| 6 | Thurston County | 231089 |
| 7 | Kitsap County | 219552 |
| 8 | Yakima County | 184371 |
| 9 | Whatcom County | 182483 |
| 10 | Benton County | 152644 |
| 11 | Skagit County | 101710 |
| 12 | Cowlitz County | 85596 |
| 13 | Island County | 71175 |
| 14 | Grant County | 70900 |
| 15 | Franklin County | 66302 |
| 16 | Clallam County | 64588 |
| 17 | Lewis County | 64000 |
| 18 | Chelan County | 61405 |
| 19 | Grays Harbor County | 60530 |
| 20 | Mason County | 53265 |
| 21 | Walla Walla County | 49597 |
| 22 | Whitman County | 40521 |
| 23 | Stevens County | 36608 |
| 24 | Kittitas County | 36115 |
| 25 | Okanogan County | 32978 |
| 26 | Douglas County | 32199 |
| 27 | Jefferson County | 28951 |
| 28 | Pacific County | 19358 |
| 29 | Klickitat County | 18296 |
| 30 | Asotin County | 17729 |
| 31 | San Juan County | 15258 |
| 32 | Adams County | 13630 |
| 33 | Pend Oreille County | 10878 |
| 34 | Skamania County | 9798 |
| 35 | Lincoln County | 8582 |
| 36 | Ferry County | 5831 |
| 37 | Wahkiakum County | 3655 |
| 38 | Columbia County | 3277 |
| 39 | Garfield County | 1799 |