Washington Voting-age Population By County in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of Washington was 5.94M which was 77.94% of the total Washington population. Among all Washington counties, King had the highest voting-age population (1.79M), followed by Pierce (696.51K), and Snohomish (634.35K).

On the other hand, the counties with the least voting-age population were: Garfield (1.84K), Columbia (3.23K), and Wahkiakum (3.63K).

The chart and table below shows the voting-age population of each county and the percentage of each county's population that are of voting-age.

You can see similar information for other states and by state for the United States.

Related Topics: Washington ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates, 2021 Census.

Washington Voting-age Population By County in 2021

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County	Voting-age Population	% of County Population
Adams	13114	64.43
Asotin	17676	79.32
Benton	149977	73.32
Chelan	60073	76.52
Clallam	63702	83.02
Clark	378392	76.21
Columbia	3227	81.31
Cowlitz	84404	77.11
Douglas	31614	74.17
Ferry	5939	82.51
Franklin	64490	67.66
Garfield	1837	80.64
Grant	68943	70.44
Grays Harbor	59434	79.52
Island	70346	81.86
Jefferson	28689	88.03
King	1788386	79.81
Kitsap	217388	79.61
Kittitas	36609	82.93
Klickitat	18127	80.64
Lewis	63549	78.25
Lincoln	8413	77.91
Mason	52189	80.33
Okanogan	32219	76.77
Pacific	19370	84.31
Pend Oreille	10710	80.51
Pierce	696507	76.52
San Juan	15338	86.99
Skagit	100325	78.24
Skamania	9812	81.95
Snohomish	634352	77.36
Spokane	413775	77.85
Stevens	36132	78.45
Thurston	228211	78.52
Wahkiakum	3631	83.03
Walla Walla	48962	78.76
Whatcom	181099	80.66
Whitman	40872	84.80
Yakima	179071	70.18