Washington Population By County in 2020

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2020, the population of Washington was 7,724,566. Among all Washington counties, King had the highest population (2,274,282), followed by Pierce (923,589), and Snohomish (829,933). Garfield was the least populated county (2,294).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

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

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Washington Population By County in 2020
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County Population % of State Population
Adams 20607 0.27
Asotin 22324 0.29
Benton 207419 2.69
Chelan 79238 1.03
Clallam 77367 1.00
Clark 505338 6.54
Columbia 3949 0.05
Cowlitz 111014 1.44
Douglas 43029 0.56
Ferry 7198 0.09
Franklin 97150 1.26
Garfield 2294 0.03
Grant 99441 1.29
Grays Harbor 75855 0.98
Island 86998 1.13
Jefferson 33061 0.43
King 2274282 29.44
Kitsap 275823 3.57
Kittitas 44599 0.58
Klickitat 22814 0.30
Lewis 82553 1.07
Lincoln 10928 0.14
Mason 66034 0.86
Okanogan 42139 0.55
Pacific 23495 0.30
Pend Oreille 13502 0.18
Pierce 923589 11.96
San Juan 17826 0.23
Skagit 129902 1.68
Skamania 12041 0.16
Snohomish 829933 10.74
Spokane 541175 7.01
Stevens 46591 0.60
Thurston 295998 3.83
Wahkiakum 4448 0.06
Walla Walla 62623 0.81
Whatcom 227449 2.94
Whitman 47807 0.62
Yakima 256733 3.32