Ranking of Washington Counties By Population in 2018

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2018, the Population for Washington was 7.53M. Among all Washington counties, King County had the highest population (2.23M), followed by Pierce County (894.95K), and Snohomish County (814.11K).

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 2018
King
Pierce
Snohomish
Spokane
Clark
Thurston
Kitsap
Yakima
Whatcom
Benton
Ranking of Washington Counties By Population in 2018
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Rank County Population
1 King County 2228488
2 Pierce County 894951
3 Snohomish County 814107
4 Spokane County 513502
5 Clark County 482467
6 Thurston County 285672
7 Kitsap County 269583
8 Yakima County 250633
9 Whatcom County 225098
10 Benton County 201174
11 Skagit County 127728
12 Cowlitz County 108673
13 Grant County 96497
14 Franklin County 93950
15 Island County 84391
16 Lewis County 79466
17 Clallam County 76792
18 Chelan County 76612
19 Grays Harbor County 73787
20 Mason County 65533
21 Walla Walla County 60778
22 Whitman County 49821
23 Kittitas County 47341
24 Stevens County 45305
25 Douglas County 42518
26 Okanogan County 42058
27 Jefferson County 31864
28 Asotin County 22699
29 Klickitat County 22095
30 Pacific County 22052
31 Adams County 19640
32 San Juan County 16991
33 Pend Oreille County 13583
34 Skamania County 11920
35 Lincoln County 10708
36 Ferry County 7661
37 Wahkiakum County 4343
38 Columbia County 4055
39 Garfield County 2257