Washington Citizen Population By County in 2010 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2010, the citizen population for Washington was 6,092,875 and represented 92.86% of the total Washington population.

Among all Washington counties, King had the highest citizen population (1.68M), followed by Pierce (747.27K), and Snohomish (643.78K).

In terms of percentages, Asotin had the highest percentage of its population being citizens (99.04%), followed by Columbia (98.99%), and Pend Oreille (98.95%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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

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Washington Citizen Population By County in 2010
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County Citizen Population % of County Population
King 1678580 89.33
Pierce 747265 95.48
Snohomish 643775 92.73
Spokane 448795 97.30
Clark 391685 94.42
Kitsap 240445 97.21
Thurston 236430 97.07
Yakima 204555 86.48
Whatcom 185225 94.51
Benton 155565 93.11
Skagit 107350 93.16
Cowlitz 97690 96.49
Island 76820 97.69
Grant 73400 86.21
Lewis 72105 96.59
Grays Harbor 69260 96.07
Clallam 69045 97.74
Chelan 65650 92.47
Mason 57230 96.53
Franklin 56190 78.78
Walla Walla 53115 92.24
Stevens 42645 98.78
Whitman 40775 93.21
Kittitas 38550 96.69
Okanogan 37530 93.27
Douglas 32510 87.49
Jefferson 29255 98.92
Asotin 21160 99.04
Pacific 20295 95.78
Klickitat 19245 95.96
San Juan 14920 95.95
Adams 14580 81.52
Pend Oreille 12770 98.95
Skamania 10675 98.21
Lincoln 10385 98.58
Ferry 7400 98.60
Columbia 3915 98.99
Wahkiakum 3915 98.37
Garfield 2190 97.77