Ranking of Washington Counties By Population in 2021

Updated on June 21, 2025.

Based on the US Census Vintage data estimates, in 2021, the Population for Washington was 7.74M. Among all Washington counties, King County had the highest population (2.25M), followed by Pierce County (927.74K), and Snohomish County (836.24K).

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.

Related Topics: Washington Census Vintage Data Topic List.

Data Source: US Census Bureau (Vintage), 2021 Census.

See this for other years:

Ranking of Washington Counties By Population in 2021

King

Pierce

Snohomish

Spokane

Clark

Thurston

Kitsap

Yakima

Whatcom

Benton

Ranking of Washington Counties By Population in 2021

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Rank	County	Population
1	King County	2253242
2	Pierce County	927738
3	Snohomish County	836235
4	Spokane County	545540
5	Clark County	512662
6	Thurston County	298241
7	Kitsap County	276629
8	Yakima County	256743
9	Whatcom County	226725
10	Benton County	210627
11	Skagit County	131018
12	Cowlitz County	111701
13	Grant County	100437
14	Franklin County	98107
15	Island County	87581
16	Lewis County	84590
17	Chelan County	79854
18	Clallam County	78476
19	Grays Harbor County	76859
20	Mason County	67255
21	Walla Walla County	62232
22	Stevens County	47620
23	Kittitas County	45653
24	Douglas County	43847
25	Whitman County	43242
26	Okanogan County	42785
27	Jefferson County	33558
28	Pacific County	23995
29	Klickitat County	23177
30	Asotin County	22476
31	Adams County	20653
32	San Juan County	18623
33	Pend Oreille County	13897
34	Skamania County	12214
35	Lincoln County	11285
36	Ferry County	7290
37	Wahkiakum County	4586
38	Columbia County	4019
39	Garfield County	2348