Ranking of Washington Counties By Population in 2015

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2015, the Population for Washington was 7.17M. Among all Washington counties, King County had the highest population (2.13M), followed by Pierce County (844.32K), and Snohomish County (770.02K).

The chart below shows the top 10 counties, and the table below shows the ranking of all Washington counties.

You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.

See this for other years:
Ranking of Washington Counties By Population in 2015
King
Pierce
Snohomish
Spokane
Clark
Thurston
Kitsap
Yakima
Whatcom
Benton
Ranking of Washington Counties By Population in 2015
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Rank County Population
1 King County 2127372
2 Pierce County 844317
3 Snohomish County 770022
4 Spokane County 488970
5 Clark County 457320
6 Thurston County 268175
7 Kitsap County 259467
8 Yakima County 247648
9 Whatcom County 211942
10 Benton County 190282
11 Skagit County 121589
12 Cowlitz County 103031
13 Grant County 93517
14 Franklin County 88681
15 Island County 80135
16 Lewis County 75474
17 Chelan County 75030
18 Clallam County 73261
19 Grays Harbor County 71027
20 Mason County 60999
21 Walla Walla County 59970
22 Whitman County 48224
23 Stevens County 43576
24 Kittitas County 43120
25 Okanogan County 41345
26 Douglas County 40521
27 Jefferson County 30376
28 Asotin County 22167
29 Klickitat County 21009
30 Pacific County 20890
31 Adams County 19208
32 San Juan County 16155
33 Pend Oreille County 13095
34 Skamania County 11386
35 Lincoln County 10287
36 Ferry County 7526
37 Wahkiakum County 3989
38 Columbia County 3961
39 Garfield County 2223