Census tract · King County
Census Tract 243.01, King County, Washington
Census Tract 243.01, GEOID 53033024301, in King County, Washington, entirely within Mercer Island. 5,088 residents in the ACS 2020-2024 5-year estimates (±486); the 2020 Census counted 5,153.
Residents, 2020-2024
5,088
±486 (90% margin)
2020 Census count: 5,153
Median household income
$113,824
±$47,236 (90% margin)
King County: $124,746
Median home value
$1,224,500
±$507,643 (90% margin)
King County: $859,900
Median gross rent
$2,445
±$201 (90% margin)
King County: $2,092
Where is Census Tract 243.01?
Census Tract 243.01 is one of 495 census tracts in King County, Washington. It covers 0.53 square miles of land, 9,650 residents per square mile in 2020. Its GEOID, 53033024301, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Mercer Island | 100% |
3 census tracts border Census Tract 243.01: Tract 243.02 ($250,000 or more), 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 243.01?
The 2020-2024 American Community Survey puts Census Tract 243.01's population at 5,088 (±486) in 2,772 households; the 2020 Census counted 5,153 residents and 2,786 housing units.
| Measure | Tract 243.01 | Mercer Island |
|---|---|---|
| Total population | 5,088±486 | 25,307 |
| Households | 2,772±297 | 10,068 |
| Average household size | 1.80±0.14 | 2.50 |
| Housing units | 2,881±276 | 10,609 |
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 243.01?
The median resident of Census Tract 243.01 is 47.1 years old; 12.7% are under 18 and 27.3% are 65 or older. The largest group is non-Hispanic white residents at 60.8%, then non-Hispanic Asian residents at 26.0%. 33.4% of residents were born outside the United States.
| Measure | Tract 243.01 | Mercer Island |
|---|---|---|
| Median age | 47.1±7.0 | 46.4 |
| Under 18 years | 12.7%±2.2 pts | 21.5% |
| 65 years and over | 27.3%±6.5 pts | 22.2% |
| Hispanic or Latino (any race) | 2.8%±2.9 pts | 2.4% |
| White alone, not Hispanic | 60.8%±7.2 pts | 63.3% |
| Black or African American alone, not Hispanic | 1.0%±1.1 pts | 0.9% |
| Asian alone, not Hispanic | 26.0%±6.3 pts | 24.4% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.8 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.8 pts | 0.0% |
| Two or more races, not Hispanic | 9.4%±3.6 pts | 8.4% |
| Some other race alone, not Hispanic | 0.0%±0.8 pts | 0.6% |
| Born outside the United States | 33.4%±7.0 pts | 26.4% |
| Speak a language other than English at home (age 5+) | 33.1%±7.2 pts | 25.6% |
| Civilian veterans (age 18+) | 5.4%±2.6 pts | 4.6% |
| With a disability | 13.5%±5.0 pts | 9.2% |
| No health insurance coverage | 1.2%±1.8 pts | 1.2% |
| High school graduate or higher (age 25+) | 97.5%±1.7 pts | 98.4% |
| Bachelor's degree or higher (age 25+) | 70.5%±6.2 pts | 81.4% |
| Graduate or professional degree (age 25+) | 37.0%±6.1 pts | 44.7% |
| Lived in the same house a year earlier | 71.9%±9.3 pts | 86.8% |
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 243.01 earn?
Half of the 2,772 households in Census Tract 243.01 earn less than $113,824 a year (±$47,236), against $124,746 across King County: 321st highest of the county's 491 tracts with a reliable estimate. 5.4% of residents live below the poverty line.
| Measure | Tract 243.01 | Mercer Island |
|---|---|---|
| Median household income | $113,824±$47,236 | $219,069 |
| Mean household income | $188,414±$44,778 | $318,528 |
| Per capita income | $105,110±$23,311 | $128,615 |
| People below the poverty line | 5.4%±2.5 pts | 3.8% |
| Children under 18 below the poverty line | 0.0%±6.0 pts | 2.8% |
| Households receiving SNAP | 3.0%±2.6 pts | 1.9% |
| Households with a computer | 94.2%±6.1 pts | 97.6% |
| Households with a broadband subscription | 87.3%±8.8 pts | 94.5% |
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 243.01?
Owners occupy 29.7% of Census Tract 243.01's occupied homes and renters 70.3%. The median owner-occupied home is valued at $1,224,500 by its owner (±$507,643). The median renter pays $2,445 a month including utilities, and 38.2% of renters pay 35% or more of their income on rent.
| Measure | Tract 243.01 | Mercer Island |
|---|---|---|
| Median home value (owner-occupied) | $1,224,500±$507,643 | $2,000,000 or more |
| Median gross rent | $2,445±$201 | $2,502 |
| Renters paying 35% or more of income on rent | 38.2%±11.7 pts | 38.5% |
| Median monthly owner costs, with a mortgage | $3,699±$495 | $4,000 or more |
| Owner-occupied homes | 29.7%±6.3 pts | 67.0% |
| Renter-occupied homes | 70.3%±6.3 pts | 33.0% |
| Housing units | 2,881±276 | 10,609 |
| Single-family detached homes | 13.7%±3.0 pts | 66.7% |
| Mobile homes | 1.0%±1.7 pts | 0.7% |
| Built 2020 or later | 3.6%±3.5 pts | 1.6% |
| Built 2010 to 2019 | 17.7%±7.2 pts | 8.7% |
| Built 1939 or earlier | 2.2%±2.1 pts | 3.3% |
| Households with no vehicle | 15.2%±6.8 pts | 5.7% |
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 243.01 get to work?
57.0% of Census Tract 243.01's workers drive alone and 35.1% work from home. The average trip to work takes 21.5 minutes.
| Measure | Tract 243.01 | Mercer Island |
|---|---|---|
| In the labor force (age 16+) | 64.3%±6.6 pts | 60.3% |
| Unemployment rate | 3.3%±2.9 pts | 3.0% |
| Drove alone to work | 57.0%±10.4 pts | 51.7% |
| Carpooled | 1.0%±1.6 pts | 3.8% |
| Public transportation | 5.0%±3.2 pts | 3.1% |
| Walked | 1.9%±2.0 pts | 1.6% |
| Worked from home | 35.1%±10.3 pts | 38.6% |
| Mean travel time to work | 21.5 min±2.0 | 23.6 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 243.01 compare with the other tracts in King County?
Among King County's tracts with a reliable estimate, Census Tract 243.01 ranks as shown below (1 = highest).
| Measure | In King County | In Mercer Island |
|---|---|---|
| Population | 160th of 494 | 1st of 6 |
| Residents per square mile | 120th of 494 | 1st of 6 |
| Median household income | 321st of 491 | 6th of 6 |
| Per capita income | 80th of 494 | 5th of 6 |
| Median home value | 80th of 481 | 6th of 6 |
| Median gross rent | 138th of 483 | 4th of 5 |
| Poverty rate | 240th of 316 | 2nd of 4 |
| Bachelor's degree or higher | 167th of 494 | 6th of 6 |
| Median age | 31st of 494 | 4th of 6 |
| Owner-occupied share | 415th of 483 | 6th of 6 |
The tracts next to it on King County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 309.02 | 318th | $115,688±$25,072 · within the margin of this tract |
| Tract 13 | 319th | $115,208±$36,904 · within the margin of this tract |
| Tract 100.02 | 320th | $114,796±$19,320 · within the margin of this tract |
| Tract 243.01 | 321st | $113,824±$47,236 |
| Tract 107.02 | 322nd | $113,750±$48,976 · within the margin of this tract |
| Tract 270 | 323rd | $113,611±$36,228 · within the margin of this tract |
| Tract 315.02 | 324th | $113,345±$33,287 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
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 243.01?
2 of the 18 figures for Census Tract 243.01 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