PlainCities

Census tract · King County

Census Tract 243.02, King County, Washington

Census Tract 243.02, GEOID 53033024302, in King County, Washington, entirely within Mercer Island. 3,744 residents in the ACS 2020-2024 5-year estimates (±516); the 2020 Census counted 3,954.

Residents, 2020-2024

3,744

±516 (90% margin)
2020 Census count: 3,954

Median household income

$250,000 or more

The survey's top or bottom value; no margin is published
King County: $124,746

Median home value

$2,000,000 or more

The survey's top or bottom value; no margin is published
King County: $859,900

Median gross rent

$2,403

±$2,032 (90% margin)
King County: $2,092

Where is Census Tract 243.02?

Census Tract 243.02 is one of 495 census tracts in King County, Washington. It covers 1.07 square miles of land, 3,688 residents per square mile in 2020. Its GEOID, 53033024302, names it uniquely (how tract numbers and GEOIDs work).

Places Census Tract 243.02 lies in (share of its 2020 census blocks)
PlaceShare of the tract
Mercer Island100%
Census Tract 243.02 (marked with a dot) in King County, Washington. Boundaries: Census Bureau 2024.
7895101.02102239.01242244245 243.02 2 mi
Census Tract 243.02 (shaded) and the tracts that border it, numbered. Boundaries: Census Bureau 2024 cartographic boundary file, 1:500,000.

10 census tracts border Census Tract 243.02: Tract 78 ($205,056), Tract 89 ($102,818), Tract 95 ($143,676), Tract 101.02 ($120,313), Tract 102 ($197,313), Tract 239.01 ($173,365), Tract 242 ($250,000 or more), Tract 243.01 ($113,824), Tract 244 ($132,625) and Tract 245 ($250,000 or more). The figure in brackets is each tract's median household income.

Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.

Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files

How many people live in Census Tract 243.02?

The 2020-2024 American Community Survey puts Census Tract 243.02's population at 3,744 (±516) in 1,348 households; the 2020 Census counted 3,954 residents and 1,522 housing units.

Counts, ACS 2020-2024 5-year estimates
MeasureTract 243.02Mercer IslandKing CountyWashington
Total population3,744±51625,3072,287,1717,816,116
Households1,348±18810,068941,0543,064,820
Average household size2.77±0.252.502.392.50
Housing units1,550±18110,6091,003,2843,306,620

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov

Who lives in Census Tract 243.02?

The median resident of Census Tract 243.02 is 48.1 years old; 21.6% are under 18 and 25.4% are 65 or older. The largest group is non-Hispanic white residents at 74.7%, then non-Hispanic Asian residents at 14.7%. 23.1% of residents were born outside the United States.

Age, origin, education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
MeasureTract 243.02Mercer IslandKing CountyWashington
Median age48.1±7.846.437.438.3
Under 18 years21.6%±4.3 pts21.5%19.5%21.4%
65 years and over25.4%±6.6 pts22.2%14.0%16.6%
Hispanic or Latino (any race)1.7%±1.7 pts2.4%11.0%14.4%
White alone, not Hispanic74.7%±7.3 pts63.3%52.9%63.1%
Black or African American alone, not Hispanic0.5%±0.7 pts0.9%6.4%3.8%
Asian alone, not Hispanic14.7%±5.4 pts24.4%20.5%9.7%
American Indian and Alaska Native alone, not Hispanic0.0%±1.1 pts0.0%0.4%0.8%
Native Hawaiian and Other Pacific Islander alone, not Hispanic0.0%±1.1 pts0.0%0.7%0.7%
Two or more races, not Hispanic8.2%±4.8 pts8.4%7.3%6.8%
Some other race alone, not Hispanic0.2%±0.3 pts0.6%0.6%0.6%
Born outside the United States23.1%±7.5 pts26.4%25.8%15.4%
Speak a language other than English at home (age 5+)22.1%±9.0 pts25.6%31.1%21.4%
Civilian veterans (age 18+)1.3%±1.2 pts4.6%4.5%7.8%
With a disability8.0%±2.8 pts9.2%10.3%13.6%
No health insurance coverage1.9%±1.8 pts1.2%5.2%6.3%
High school graduate or higher (age 25+)99.1%±1.2 pts98.4%93.8%92.3%
Bachelor's degree or higher (age 25+)80.4%±5.7 pts81.4%56.7%39.6%
Graduate or professional degree (age 25+)51.7%±5.7 pts44.7%24.2%15.6%
Lived in the same house a year earlier90.1%±6.0 pts86.8%83.3%85.5%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov

What do households in Census Tract 243.02 earn?

Half of the 1,348 households in Census Tract 243.02 earn less than $250,000 or more a year (), against $124,746 across King County: 1st highest of the county's 491 tracts with a reliable estimate. 2.9% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
MeasureTract 243.02Mercer IslandKing CountyWashington
Median household income$250,000 or more$219,069$124,746$98,141
Mean household income$398,444±$56,976$318,528$176,799$134,588
Per capita income$146,112±$16,879$128,615$74,100$53,744
People below the poverty line2.9%±1.9 pts3.8%8.6%9.9%
Children under 18 below the poverty line0.0%±4.8 pts2.8%9.7%11.6%
Households receiving SNAP1.0%±1.5 pts1.9%8.2%11.5%
Households with a computer99.3%±1.3 pts97.6%98.1%97.1%
Households with a broadband subscription99.3%±1.3 pts94.5%95.1%93.6%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What does housing cost in Census Tract 243.02?

Owners occupy 82.6% of Census Tract 243.02's occupied homes and renters 17.4%. The median owner-occupied home is valued at $2,000,000 or more by its owner ().

Housing, ACS 2020-2024 5-year estimates
MeasureTract 243.02Mercer IslandKing CountyWashington
Median home value (owner-occupied)$2,000,000 or more$2,000,000 or more$859,900$564,600
Median gross rent$2,403±$2,032$2,502$2,092$1,760
Renters paying 35% or more of income on rent53.7%±32.2 pts38.5%37.5%40.1%
Median monthly owner costs, with a mortgage$4,000 or more$4,000 or more$3,273$2,445
Owner-occupied homes82.6%±10.6 pts67.0%55.4%63.8%
Renter-occupied homes17.4%±10.6 pts33.0%44.6%36.2%
Housing units1,550±18110,6091,003,2843,306,620
Single-family detached homes89.6%±6.4 pts66.7%50.0%61.9%
Mobile homes2.6%±3.8 pts0.7%1.4%5.5%
Built 2020 or later0.1%±0.6 pts1.6%2.1%2.3%
Built 2010 to 201911.7%±5.1 pts8.7%14.2%12.1%
Built 1939 or earlier12.4%±6.3 pts3.3%10.9%9.6%
Households with no vehicle0.1%±0.7 pts5.7%11.2%7.1%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov

How do people in Census Tract 243.02 get to work?

43.6% of Census Tract 243.02's workers drive alone and 48.6% work from home. The average trip to work takes 24.1 minutes.

Work and commuting, ACS 2020-2024 5-year estimates
MeasureTract 243.02Mercer IslandKing CountyWashington
In the labor force (age 16+)55.1%±7.1 pts60.3%69.9%64.5%
Unemployment rate4.8%±4.2 pts3.0%4.8%5.1%
Drove alone to work43.6%±10.8 pts51.7%50.4%63.4%
Carpooled5.1%±4.4 pts3.8%7.0%8.5%
Public transportation1.5%±1.9 pts3.1%6.8%3.4%
Walked1.1%±1.5 pts1.6%4.3%3.0%
Worked from home48.6%±11.5 pts38.6%29.2%19.8%
Mean travel time to work24.1 min±3.823.6 min27.6 min26.6 min

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

How does Census Tract 243.02 compare with the other tracts in King County?

Among King County's tracts with a reliable estimate, Census Tract 243.02 ranks as shown below (1 = highest).

Census Tract 243.02's rank among the tracts of King County and of Mercer Island
MeasureIn King CountyIn Mercer Island
Population360th of 4944th of 6
Residents per square mile349th of 4943rd of 6
Median household income1st of 4911st of 6
Per capita income9th of 4942nd of 6
Median home value1st of 4811st of 6
Poverty rate304th of 3164th of 4
Bachelor's degree or higher67th of 4944th of 6
Median age19th of 4941st of 6
Owner-occupied share95th of 4834th of 6

The tracts next to it on King County's income ladder

Median household income, ACS 2020-2024 5-year estimates
TractRankMedian household incomeResidents
Tract 41.011st$250,000 or more3,999
Tract 621st$250,000 or more4,193
Tract 239.021st$250,000 or more2,709
Tract 2411st$250,000 or more4,606
Tract 2421st$250,000 or more2,928
Tract 243.021st$250,000 or more3,744
Tract 2451st$250,000 or more4,966
Tract 246.011st$250,000 or more4,772
Tract 246.021st$250,000 or more3,485
Tract 249.041st$250,000 or more2,909
Tract 250.081st$250,000 or more2,533
Tract 322.131st$250,000 or more4,775
Tract 322.151st$250,000 or more5,922
Tract 322.211st$250,000 or more6,173
Tract 322.241st$250,000 or more2,804
Tract 323.161st$250,000 or more5,546
Tract 323.181st$250,000 or more6,767
Tract 323.201st$250,000 or more4,474
Tract 323.211st$250,000 or more6,925
Tract 326.031st$250,000 or more4,171

Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed

How reliable are the figures for Census Tract 243.02?

3 of the 18 figures for Census Tract 243.02 on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.

A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). How to read a margin of error.

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · Check it at data.census.gov

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections