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List of Cities and Counties in Washington

Discover Washington’s population facts easily with our list of counties and cities. Find out how many people live in each area, from big cities to small towns, and see how Washington’s population is spread out across the state.

Cities in Washington
Jeffery Hayes, CC BY-SA 3.0, via Wikimedia Commons

Washington Counties by Population

A county is an administrative subdivision of a US state or territory. As of 2024, Washington is divided into 39 counties. The average county is 1,830 square miles, with 197,571 people.

King County is the most populous county and also has the highest population density in the State of Washington. Garfield County is both the least populated (2,286) and least densely populated (3.1/sq mi ). Okanogan is the largest county by Area in Washington and  San Juan is the smallest by area.

read about the Population of Washington (state)

#CountyPopulation Land area (sq. mi.)
1King County2,269,6752,115
2Pierce County921,1301,670
3Snohomish County827,9572,087
4Spokane County539,3391,764
5Clark County503,311629
6Thurston County294,793722
7Kitsap County275,611395
8Yakima County256,7284,296
9Whatcom County226,8472,107
10Benton County206,8731,700
11Skagit County129,5231,731
12Cowlitz County110,7301,139
13Grant County99,1232,680
14Franklin County96,7491,242
15Island County86,857209
16Lewis County82,1492,403
17Chelan County79,0742,920
18Clallam County77,1551,738
19Grays Harbor County75,6361,902
20Mason County65,726959
21Walla Walla County62,5841,270
22Whitman County47,9732,159
23Stevens County46,4452,478
24Kittitas County44,3372,297
25Douglas County42,9381,819
26Okanogan County42,1045,268
27Jefferson County32,9771,804
28Pacific County23,365933
29Klickitat County22,7351,872
30Asotin County22,285636
31Adams County20,6131,925
32San Juan County17,788174
33Pend Oreille County13,4011,400
34Skamania County12,0361,656
35Lincoln County10,8762,311
36Ferry County7,1782,204
37Wahkiakum County4,422264
38Columbia County3,952869
39Garfield County2,286710

Source: US Census report 2021

read about the race and ethnicity in Washington (state)

Top cities in Washington by population

Washington is divided into 39 counties and contains 281 municipalities that are divided into 20 cities, 69 towns, and 192 municipal code cities. Seattle is the largest city in the state with a population of 737,015 followed by Spokane (228,989) and  Tacoma (219,346).

Let’s have a look at the Top Cities in Washington by Population

#CityCountyPopulation 2020
1SeattleKing737,015
2SpokaneSpokane228,989
3TacomaPierce219,346
4VancouverClark190,915
5BellevueKing151,854
6KentKing136,588
7EverettSnohomish110,629
8RentonKing106,785
9Spokane ValleySpokane102,976
10Federal WayKing101,030
11YakimaYakima96,968
12KirklandKing92,175
13BellinghamWhatcom91,482
14KennewickBenton83,921
15PascoFranklin77,108
16RedmondKing73,256
17MarysvilleSnohomish70,714
18AuburnKing70,180
19SammamishKing67,455
20LakewoodPierce63,612

Source: US Census Bureau population estimate 2020

Most Populous Counties in Washington

The most populous county in Washington is King County with 2.27 million residents. It is followed by Pierce County (1 million) and Snohomish County (0.82 million)

Let’s have a look at the Top 10 most populous counties

#CountyPopulation 
1King County2,269,675
2Pierce County921,130
3Snohomish County827,957
4Spokane County539,339
5Clark County503,311
6Thurston County294,793
7Kitsap County275,611
8Yakima County256,728
9Whatcom County226,847
10Benton County206,873
Least Populated Washington County

The least populous county is Garfield County with 2,286 residents, it’s followed by Columbia and Wahkiakum County.

Let’s have look at 5 least populated counties in Washington (State)

#CountyPopulation 
1Garfield County2,286
2Columbia County3,952
3Wahkiakum County4,422
4Ferry County7,178
5Lincoln County10,876

read about religion in Washington State

Largest Counties in Washington by area

The Largest county by Land Area in Washington is Okanogan County with an area of 5,268 sq. miles. Yakima with an area of 4,296 sq. mi. comes next followed by Chelan County (2,920 sq. mi.)

Let’s have a look at the Top 10 counties by Area

#CountyLand area (sq. mi.)
1Okanogan County5,268
2Yakima County4,296
3Chelan County2,920
4Grant County2,680
5Stevens County2,478
6Lewis County2,403
7Lincoln County2,311
8Kittitas County2,297
9Ferry County2,204
10Whitman County2,159
Smallest County in Washington by area

The smallest county by area in Washington is San Juan with an area of 174 square miles.

#CountyLand area (sq. mi.)
1San Juan County174
2Island County209
3Wahkiakum County264
4Kitsap County395
5Clark County629

source: US Census report 2021

Most Densely populated Counties in Washington

The most densely populated county in Washington is King County, with 1073 people per sq. mi. Next comes Clark County with 800 people per sq. mi followed by Kitsap County (698/ sq.mi)

Let’s have a look at the Top 10 densely populated counties

#CountyDensity (people/sq. mi)
1King County1,073.13
2Clark County800.18
3Kitsap County697.75
4Pierce County551.57
5Island County415.58
6Thurston County408.30
7Snohomish County396.72
8Spokane County305.75
9Benton County121.69
10Whatcom County107.66
Least Densely Populated County in Washington
#CountyDensity (people/sq. mi)
1Garfield County3.22
2Ferry County3.26
3Columbia County4.55
4Lincoln County4.71
5Skamania County7.27

Sources

Religion in United States
Race and Ethnicity in US
US State by Population
Top Cities in Washington by Population | List of Counties in Washington

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