King County, Washington

County seat: Seattle · Population 2.3 million (2025) · 2,116 sq mi

King County is the most populous of Washington's 39 counties, with 2,344,939 people (2025 estimate). Its county seat is Seattle. The map shows its 39 cities and towns and the 6 neighboring counties.

Map of King County, Washington with cities, towns and the county boundary
King County, Washington with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 264 KBPNG image 164 KBWashington county map

King County facts

County seat
Seattle
Population (2025 estimate)
2,344,939 +3.3% since 2020
Land area
2,116 sq mi 11th largest of 39
Water area
192 sq mi
Population density
1,108 per sq mi
Established
1852
Named after
Martin Luther King Jr. American Baptist minister and civil rights leader (1929–1968)
Largest city
Seattle 784,777
Median household income
$124,746
Cities and towns
39 plus 24 CDPs
ZIP codes
89
Time zone
Pacific
FIPS code
53033

Cities and towns in King County

King County has 39 incorporated cities, towns and villages. Populations count the people living inside King County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Seattle (county seat)City784,777
BellevueCity154,193
KentCity134,871
RentonCity104,975
Federal WayCity99,729
KirklandCity97,410
RedmondCity82,506
AuburnCity76,637Pierce County
ShorelineCity66,542
SammamishCity66,110
BurienCity51,859
IssaquahCity39,423
SeaTacCity34,578
Des MoinesCity33,032
BothellCity31,871Snohomish County
Maple ValleyCity28,482
Mercer IslandCity25,422
KenmoreCity24,249
TukwilaCity22,003
CovingtonCity21,496
WoodinvilleCity14,548
SnoqualmieCity13,640
Lake Forest ParkCity13,191
EnumclawCity13,172Pierce County
NewcastleCity13,128
DuvallCity9,440
North BendCity8,758
PacificCity7,014Pierce County
Black DiamondCity6,978
Normandy ParkCity6,609
AlgonaCity3,253
Clyde HillCity3,161
MedinaCity2,974
CarnationCity2,471
MiltonCity1,854Pierce County
Yarrow PointTown1,143
Hunts PointTown461
Beaux Arts VillageTown315
SkykomishTown157

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Union Hill-Novelty Hill23,047
Cottage Lake22,518
Fairwood17,856
Bryn Mawr-Skyway17,638
Lakeland North15,950
White Center14,886
Lakeland South13,100
East Renton Highlands12,582
Lake Morton-Berrydale11,183
Vashon9,934
Hobart6,552
Boulevard Park4,575
Maple Heights-Lake Desire4,113
Mirrormont4,019
Lake Holm3,555
Shadow Lake2,465
Riverbend1,748
Fall City1,618
Wilderness Rim1,560
Lake Marcel-Stillwater1,549
Ames Lake1,245
Riverpoint831
Ravensdale198
Baring177

ZIP codes in King County

89 ZIP codes reach into King County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of King County, 2020–2025

King County grew by 75,271 people (+3.3%) between April 2020 and July 2025: 40,683 more births than deaths and a net gain of 36,825 people from migration.

Year (July 1)Population
20202,274,304
20212,253,549
20222,265,822
20232,283,086
20242,317,959
20252,344,939

Neighboring counties

Printable King County map

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Sources

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