What is the largest city in King County, WA?

Seattle is the largest city or town in King County, with about 754,195 residents.

How many ZIP codes are in King County?

King County includes 87 ZIP Code Tabulation Areas, including 98001, 98002, 98003, 98004, 98005.

What is the population of King County, WA?

About 2,287,171 people live in King County, based on American Community Survey 5-year estimates.

What counties border King County?

King County borders Pierce County, Snohomish County, Yakima County, Chelan County, Kittitas County.

King County, WA: Cities, ZIP Codes & Local Data

Population

2,287,171

Land area

2,116sq mi

People per sq mi

1,081

ZIP codes

87

King County at a glance

King County is about 9.2 times as dense as Washington as a whole.
No county in Washington has more people.
The median household income is $124,746, 27% above the Washington median of $98,141.
A typical owner-occupied home is valued at $859,900 (52% above Washington) and median rent is $2,092 a month.
Its largest cities are Seattle (754,195), Bellevue (151,847) and Kent (135,603).

Local data for King County, WA

Counts from official public data

Housing and community stats

King County, WA, American Community Survey 2020-2024

Full profile

Median household income

$124,746

Poverty rate

8.6%

Median home value

$859,900

Prices +0.9% in a year

Median rent

$2,092/mo

Homeownership

55.4%

Bachelor's or higher

56.7%

Median age

37.4

Average commute

27.6 min

Largest reported origins and ancestries: German Americans (273,985), Irish Americans (196,924), Mexican Americans (161,863).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.8%

Sep 2026, 0.0 pts in a year

Average annual pay

$136,848

1,436,484 jobs, 2025

Income per person

$128,684

BEA, 2024

Federal spending

$24.6B

FY 2026, $10,843 per person

PPP loans

$7.9B

76,577 loans, 743,259 jobs reported

Campaign donations

$55.3M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

King County, WA, workers 16 and older. American Community Survey 5-year estimates

Drove alone50.4%
Carpooled7.0%
Public transit6.8%
Walked4.3%
Bicycle1.1%
Taxi, ride-hailing, motorcycle or other1.3%
Worked from home29.2%

Average one-way commute: 27.6 minutes for people who do not work from home.

Environment and hazard risk

King County, WA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Very High

Top: earthquake

Storm events since 1996

75

Most often lightning

Flood insurance policies

4,529

0.8% of homes, county

July high / Jan low

70° / 32°F

99.8 inches of rain a year

Hazards, floods and storm history Check a flood zone 237 historic places

Health statistics

Share of adults in King County, WA, CDC PLACES estimates

All 40 measures

Obesity

22.6%

U.S. 33.3% -10.7 pts

Diabetes

7.3%

U.S. 12.1% -4.8 pts

Smoking

7.2%

U.S. 12.8% -5.6 pts

Uninsured (18-64)

6.8%

U.S. 11.1% -4.3 pts

Cities, towns and ZIP codes in King County

Population shown

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Frequently asked questions

What is the largest city in King County, WA?: Seattle is the largest city or town in King County, with about 754,195 residents.
How many ZIP codes are in King County?: King County includes 87 ZIP Code Tabulation Areas, including 98001, 98002, 98003, 98004, 98005.
What is the population of King County, WA?: About 2,287,171 people live in King County, based on American Community Survey 5-year estimates.
What counties border King County?: King County borders Pierce County, Snohomish County, Yakima County, Chelan County, Kittitas County.