Census tract · Cook County
Census Tract 8240.05, Cook County, Illinois
Census Tract 8240.05, GEOID 17031824005, in Cook County, Illinois, entirely within Lemont Township. 5,679 residents in the ACS 2020-2024 5-year estimates (±706); the 2020 Census counted 5,933.
Residents, 2020-2024
5,679
±706 (90% margin)
2020 Census count: 5,933
Median household income
$150,222
±$28,481 (90% margin)
Cook County: $83,498
Median home value
$437,600
±$57,935 (90% margin)
Cook County: $324,500
Median gross rent
$2,310
±$1,047 (90% margin)
Cook County: $1,435
Where is Census Tract 8240.05?
Census Tract 8240.05 is one of 1,332 census tracts in Cook County, Illinois. It covers 4.24 square miles of land, 1,399 residents per square mile in 2020. Its GEOID, 17031824005, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Lemont Township | 100% |
| Lemont | 73% |
| Woodridge | 1% |
6 census tracts border Census Tract 8240.05: Tract 8240.03 ($108,553), Tract 8240.04 ($99,911), Tract 8240.06 ($157,158), Tract 8458.03 in DuPage County ($71,638), Tract 8802.02 in Will County ($104,788) and Tract 8810.01 in Will County ($129,811). 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 8240.05?
The 2020-2024 American Community Survey puts Census Tract 8240.05's population at 5,679 (±706) in 2,038 households; the 2020 Census counted 5,933 residents and 2,168 housing units.
| Measure | Tract 8240.05 | Lemont Township |
|---|---|---|
| Total population | 5,679±706 | 22,564 |
| Households | 2,038±215 | 8,217 |
| Average household size | 2.79±0.19 | 2.69 |
| Housing units | 2,038±215 | 8,513 |
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 8240.05?
The median resident of Census Tract 8240.05 is 43.6 years old; 25.4% are under 18 and 16.7% are 65 or older. The largest group is non-Hispanic white residents at 85.7%, then Hispanic or Latino residents (of any race) at 6.8%. 18.2% of residents were born outside the United States.
| Measure | Tract 8240.05 | Lemont Township |
|---|---|---|
| Median age | 43.6±1.6 | 44.5 |
| Under 18 years | 25.4%±4.5 pts | 24.8% |
| 65 years and over | 16.7%±3.8 pts | 22.4% |
| Hispanic or Latino (any race) | 6.8%±2.6 pts | 9.2% |
| White alone, not Hispanic | 85.7%±6.8 pts | 84.8% |
| Black or African American alone, not Hispanic | 0.0%±0.7 pts | 1.6% |
| Asian alone, not Hispanic | 5.7%±6.1 pts | 2.7% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.7 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 1.4%±1.4 pts | 1.6% |
| Some other race alone, not Hispanic | 0.4%±0.6 pts | 0.1% |
| Born outside the United States | 18.2%±6.8 pts | 16.4% |
| Speak a language other than English at home (age 5+) | 30.9%±11.5 pts | 28.1% |
| Civilian veterans (age 18+) | 2.2%±1.2 pts | 5.4% |
| With a disability | 6.3%±2.8 pts | 10.0% |
| No health insurance coverage | 2.4%±1.8 pts | 1.6% |
| High school graduate or higher (age 25+) | 97.0%±2.7 pts | 95.9% |
| Bachelor's degree or higher (age 25+) | 44.5%±7.5 pts | 45.8% |
| Graduate or professional degree (age 25+) | 17.7%±4.7 pts | 20.0% |
| Lived in the same house a year earlier | 98.0%±1.8 pts | 94.6% |
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 8240.05 earn?
Half of the 2,038 households in Census Tract 8240.05 earn less than $150,222 a year (±$28,481), against $83,498 across Cook County: 121st highest of the county's 1,258 tracts with a reliable estimate.
| Measure | Tract 8240.05 | Lemont Township |
|---|---|---|
| Median household income | $150,222±$28,481 | $120,984 |
| Mean household income | $162,631±$20,458 | $151,684 |
| Per capita income | $57,679±$6,917 | $56,016 |
| People below the poverty line | 2.2%±2.1 pts | 3.9% |
| Children under 18 below the poverty line | 0.0%±2.6 pts | 0.7% |
| Households receiving SNAP | 5.4%±4.4 pts | 4.2% |
| Households with a computer | 98.7%±2.2 pts | 94.2% |
| Households with a broadband subscription | 98.3%±2.2 pts | 92.4% |
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 8240.05?
Owners occupy 94.3% of Census Tract 8240.05's occupied homes and renters 5.7%. The median owner-occupied home is valued at $437,600 by its owner (±$57,935). The median renter pays $2,310 a month including utilities.
| Measure | Tract 8240.05 | Lemont Township |
|---|---|---|
| Median home value (owner-occupied) | $437,600±$57,935 | $484,400 |
| Median gross rent | $2,310±$1,047 | $1,025 |
| Renters paying 35% or more of income on rent | 0.0%±30.1 pts | 42.3% |
| Median monthly owner costs, with a mortgage | $2,849±$322 | $2,800 |
| Owner-occupied homes | 94.3%±4.3 pts | 85.8% |
| Renter-occupied homes | 5.7%±4.3 pts | 14.2% |
| Housing units | 2,038±215 | 8,513 |
| Single-family detached homes | 91.5%±4.7 pts | 76.2% |
| Mobile homes | 0.0%±1.8 pts | 0.0% |
| Built 2020 or later | 0.0%±1.8 pts | 1.3% |
| Built 2010 to 2019 | 7.9%±4.2 pts | 10.7% |
| Built 1939 or earlier | 5.9%±4.8 pts | 6.5% |
| Households with no vehicle | 1.9%±2.2 pts | 4.6% |
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 8240.05 get to work?
75.3% of Census Tract 8240.05's workers drive alone and 13.8% work from home. The average trip to work takes 30.9 minutes. The unemployment rate in 2020-2024 averaged 6.4%.
| Measure | Tract 8240.05 | Lemont Township |
|---|---|---|
| In the labor force (age 16+) | 72.3%±5.3 pts | 61.1% |
| Unemployment rate | 6.4%±3.9 pts | 4.5% |
| Drove alone to work | 75.3%±7.1 pts | 72.5% |
| Carpooled | 2.0%±2.3 pts | 3.2% |
| Public transportation | 4.6%±3.4 pts | 3.9% |
| Walked | 3.7%±2.9 pts | 3.5% |
| Worked from home | 13.8%±6.2 pts | 16.3% |
| Mean travel time to work | 30.9 min±5.8 | 35.0 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 8240.05 compare with the other tracts in Cook County?
Among Cook County's tracts with a reliable estimate, Census Tract 8240.05 ranks as shown below (1 = highest).
| Measure | In Cook County |
|---|---|
| Population | 225th of 1,328 |
| Residents per square mile | 1,295th of 1,331 |
| Median household income | 121st of 1,258 |
| Per capita income | 347th of 1,325 |
| Median home value | 304th of 1,279 |
| Median gross rent | 95th of 1,254 |
| Bachelor's degree or higher | 540th of 1,264 |
| Median age | 284th of 1,327 |
| Owner-occupied share | 54th of 1,300 |
The tracts next to it on Cook County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 8241.22 | 118th | $150,388±$15,784 · within the margin of this tract |
| Tract 8437 | 119th | $150,357±$55,554 · within the margin of this tract |
| Tract 8309 | 120th | $150,288±$26,126 · within the margin of this tract |
| Tract 8240.05 | 121st | $150,222±$28,481 |
| Tract 8041.06 | 122nd | $150,132±$14,180 · within the margin of this tract |
| Tract 7201 | 123rd | $149,803±$26,191 · within the margin of this tract |
| Tract 1611 | 124th | $149,722±$46,436 · 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 8240.05?
3 of the 18 figures for Census Tract 8240.05 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