Data / Rankings / Population / Counties in Washington

Counties in Washington by population

King County had the highest population of 39 counties in 2024, at 2.32 million. Garfield County had the lowest, at 2,401. The median was 69,759 and the figure for Washington was 7.93 million. Source: the U.S. Census Bureau.

Highest2,317,959King County
Lowest2,401Garfield County
Median69,75939 counties
Washington7,927,958History

All counties, 2024

CSVChart (SVG)

King CountyKing County: 2,317,959 persons2,317,959Pierce CountyPierce County: 939,786 persons939,786Snohomish CountySnohomish County: 861,070 persons861,070Spokane CountySpokane County: 555,485 persons555,485Clark CountyClark County: 526,241 persons526,241Thurston CountyThurston County: 302,132 persons302,132Kitsap CountyKitsap County: 280,728 persons280,728Yakima CountyYakima County: 258,971 persons258,971Whatcom CountyWhatcom County: 234,601 persons234,601Benton CountyBenton County: 218,931 persons218,931Skagit CountySkagit County: 132,250 persons132,250Cowlitz CountyCowlitz County: 113,764 persons113,764Grant CountyGrant County: 104,834 persons104,834Franklin CountyFranklin County: 101,386 persons101,386Lewis CountyLewis County: 87,131 persons87,131Island CountyIsland County: 85,982 persons85,982Chelan CountyChelan County: 81,382 persons81,382Grays Harbor CountyGrays Harbor County: 78,020 persons78,020Clallam CountyClallam County: 77,930 persons77,930Mason CountyMason County: 69,759 persons69,759Walla Walla CountyWalla Walla County: 62,109 persons62,109Stevens CountyStevens County: 49,178 persons49,178Kittitas CountyKittitas County: 48,107 persons48,107Whitman CountyWhitman County: 47,863 persons47,863Douglas CountyDouglas County: 45,517 persons45,517Okanogan CountyOkanogan County: 44,648 persons44,648Jefferson CountyJefferson County: 33,891 persons33,891Pacific CountyPacific County: 24,237 persons24,237Klickitat CountyKlickitat County: 24,005 persons24,005Asotin CountyAsotin County: 22,538 persons22,538Adams CountyAdams County: 21,322 persons21,322San Juan CountySan Juan County: 18,556 persons18,556Pend Oreille CountyPend Oreille County: 14,367 persons14,367Skamania CountySkamania County: 12,644 persons12,644Lincoln CountyLincoln County: 11,827 persons11,827Ferry CountyFerry County: 7,547 persons7,547Wahkiakum CountyWahkiakum County: 4,813 persons4,813Columbia CountyColumbia County: 4,046 persons4,046Garfield CountyGarfield County: 2,401 persons2,401
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2024
persons		Change on 2023
1King County2,317,959+1.5%
2Pierce County939,786+0.9%
3Snohomish County861,070+1.5%
4Spokane County555,485+0.5%
5Clark County526,241+0.8%
6Thurston County302,132+1%
7Kitsap County280,728+1.2%
8Yakima County258,971+0.6%
9Whatcom County234,601+0.9%
10Benton County218,931+1.5%
11Skagit County132,250+0.6%
12Cowlitz County113,764+0.8%
13Grant County104,834+1.7%
14Franklin County101,386+1.7%
15Lewis County87,131+1%
16Island County85,982-0.2%
17Chelan County81,382+1.3%
18Grays Harbor County78,020+0.6%
19Clallam County77,930+0.5%
20Mason County69,759+1.4%
21Walla Walla County62,109+0.6%
22Stevens County49,178+0.6%
23Kittitas County48,107+0.7%
24Whitman County47,863+0.6%
25Douglas County45,517+1.5%
26Okanogan County44,648+2.1%
27Jefferson County33,891+0.5%
28Pacific County24,237+0.2%
29Klickitat County24,005+1.7%
30Asotin County22,538+0.2%
31Adams County21,322+2%
32San Juan County18,556-0%
33Pend Oreille County14,3670%
34Skamania County12,644+0.1%
35Lincoln County11,827+0.8%
36Ferry County7,547+0.7%
37Wahkiakum County4,813+1%
38Columbia County4,046-0.4%
39Garfield County2,401+1.9%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

Which county has the highest population?

King County, with 2.32 million in 2024, according to the U.S. Census Bureau.

Which county has the lowest population?

Garfield County, with 2,401 in 2024.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.

Population: other rankings

Counties in Washington: more rankings