Washington Citizen Voting-age Population By County in 2018 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen voting-age population for Washington was 5,173,975 and represented 70.93% of the total Washington population.
Among all Washington counties, King had the highest citizen voting-age population (1.49M), followed by Pierce (621.57K), and Snohomish (553.41K).
In terms of percentages, Jefferson had the highest percentage of its population being citizens of voting-age (85.27%), followed by San Juan (83.16%), and Wahkiakum (81.74%).
The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.
You can see similar information for other states and by state for the United States.
| County | Citizen Voting-age Population | % of County Population |
|---|---|---|
| King | 1488795 | 68.82 |
| Pierce | 621565 | 72.29 |
| Snohomish | 553405 | 70.35 |
| Spokane | 375630 | 75.45 |
| Clark | 331185 | 71.16 |
| Thurston | 206955 | 75.34 |
| Kitsap | 202505 | 77.15 |
| Whatcom | 163750 | 75.53 |
| Yakima | 144660 | 58.02 |
| Benton | 130805 | 67.37 |
| Skagit | 89235 | 72.02 |
| Cowlitz | 78900 | 75.06 |
| Island | 64560 | 79.08 |
| Clallam | 59890 | 80.41 |
| Lewis | 57985 | 75.36 |
| Grays Harbor | 55275 | 76.81 |
| Grant | 53825 | 56.74 |
| Chelan | 52540 | 69.36 |
| Mason | 48180 | 76.93 |
| Franklin | 46745 | 51.56 |
| Walla Walla | 43410 | 72.07 |
| Whitman | 37735 | 77.65 |
| Kittitas | 35685 | 79.61 |
| Stevens | 34080 | 77.08 |
| Okanogan | 28845 | 69.27 |
| Douglas | 26495 | 64.04 |
| Jefferson | 26310 | 85.27 |
| Asotin | 17400 | 77.91 |
| Pacific | 16850 | 79.18 |
| Klickitat | 16135 | 75.42 |
| San Juan | 13700 | 83.16 |
| Pend Oreille | 10425 | 78.86 |
| Skamania | 9125 | 78.53 |
| Adams | 8960 | 46.07 |
| Lincoln | 8105 | 77.67 |
| Ferry | 6145 | 81.12 |
| Wahkiakum | 3425 | 81.74 |
| Columbia | 3105 | 77.63 |
| Garfield | 1640 | 73.71 |
