Census tract · Cook County
Census Tract 8421, Cook County, Illinois
Census Tract 8421, GEOID 17031842100, in Cook County, Illinois, entirely within Chicago. 6,780 residents in the ACS 2020-2024 5-year estimates (±1,245); the 2020 Census counted 6,650.
Residents, 2020-2024
6,780
±1,245 (90% margin)
2020 Census count: 6,650
Median household income
$63,304
±$7,665 (90% margin)
Cook County: $83,498
Median home value
$227,900
±$13,451 (90% margin)
Cook County: $324,500
Median gross rent
$969
±$195 (90% margin)
Cook County: $1,435
Where is Census Tract 8421?
Census Tract 8421 is one of 1,332 census tracts in Cook County, Illinois. It covers 0.79 square miles of land, 8,461 residents per square mile in 2020. Its GEOID, 17031842100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Chicago | 100% |
8 census tracts border Census Tract 8421: Tract 2306 ($59,351), Tract 2312 ($40,122), Tract 2315 ($30,637), Tract 2510, Tract 2517 ($55,750), Tract 2602 ($49,250), Tract 2603 and Tract 2604. 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 8421?
The 2020-2024 American Community Survey puts Census Tract 8421's population at 6,780 (±1,245) in 2,190 households; the 2020 Census counted 6,650 residents and 2,460 housing units.
| Measure | Tract 8421 | Chicago |
|---|---|---|
| Total population | 6,780 ±1,245 | 2,711,226 |
| Households | 2,190 ±297 | 1,160,205 |
| Average household size | 3.09 ±0.41 | 2.29 |
| Housing units | 2,339 ±286 | 1,277,054 |
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 8421?
The median resident of Census Tract 8421 is 33.5 years old; 22.8% are under 18 and 13.2% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 53.4%, then non-Hispanic Black residents at 40.5%. 26.0% of residents were born outside the United States.
| Measure | Tract 8421 | Chicago |
|---|---|---|
| Median age | 33.5 ±8.1 | 35.8 |
| Under 18 years | 22.8% ±6.2 pts | 19.4% |
| 65 years and over | 13.2% ±5.5 pts | 13.8% |
| Hispanic or Latino (any race) | 53.4% ±10.6 pts | 29.7% |
| White alone, not Hispanic | 3.8% ±2.7 pts | 32.1% |
| Black or African American alone, not Hispanic | 40.5% ±10.6 pts | 27.4% |
| Asian alone, not Hispanic | 0.6% ±0.9 pts | 7.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.6 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.6 pts | 0.0% |
| Two or more races, not Hispanic | 0.9% ±1.1 pts | 3.0% |
| Some other race alone, not Hispanic | 0.8% ±1.2 pts | 0.4% |
| Born outside the United States | 26.0% ±8.6 pts | 20.9% |
| Speak a language other than English at home (age 5+) | 46.1% ±10.0 pts | 35.4% |
| Civilian veterans (age 18+) | 1.5% ±1.6 pts | 2.8% |
| With a disability | 13.5% ±5.3 pts | 12.1% |
| No health insurance coverage | 18.2% ±8.7 pts | 9.8% |
| High school graduate or higher (age 25+) | 78.9% ±6.9 pts | 87.2% |
| Bachelor's degree or higher (age 25+) | 14.9% ±5.7 pts | 44.3% |
| Graduate or professional degree (age 25+) | 8.7% ±4.9 pts | 19.0% |
| Lived in the same house a year earlier | 98.7% ±1.3 pts | 86.0% |
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 8421 earn?
Half of the 2,190 households in Census Tract 8421 earn less than $63,304 a year (±$7,665), against $83,498 across Cook County: 899th highest of the county's 1,258 tracts with a reliable estimate. 21.3% of residents live below the poverty line.
| Measure | Tract 8421 | Chicago |
|---|---|---|
| Median household income | $63,304 ±$7,665 | $77,902 |
| Mean household income | $80,960 ±$18,263 | $116,016 |
| Per capita income | $25,522 ±$5,345 | $50,086 |
| People below the poverty line | 21.3% ±11.9 pts | 16.8% |
| Children under 18 below the poverty line | 13.2% ±11.4 pts | 23.6% |
| Households receiving SNAP | 18.9% ±8.6 pts | 18.9% |
| Households with a computer | 90.4% ±8.0 pts | 94.9% |
| Households with a broadband subscription | 90.0% ±8.3 pts | 89.1% |
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 8421?
Owners occupy 56.5% of Census Tract 8421's occupied homes and renters 43.5%. The median owner-occupied home is valued at $227,900 by its owner (±$13,451). The median renter pays $969 a month including utilities, and 60.1% of renters pay 35% or more of their income on rent.
| Measure | Tract 8421 | Chicago |
|---|---|---|
| Median home value (owner-occupied) | $227,900 ±$13,451 | $334,100 |
| Median gross rent | $969 ±$195 | $1,440 |
| Renters paying 35% or more of income on rent | 60.1% ±20.9 pts | 39.3% |
| Median monthly owner costs, with a mortgage | $1,991 ±$229 | $2,339 |
| Owner-occupied homes | 56.5% ±10.6 pts | 46.0% |
| Renter-occupied homes | 43.5% ±10.6 pts | 54.0% |
| Housing units | 2,339 ±286 | 1,277,054 |
| Single-family detached homes | 37.0% ±11.7 pts | 25.6% |
| Mobile homes | 1.1% ±1.9 pts | 0.2% |
| Built 2020 or later | 0.0% ±1.6 pts | 0.8% |
| Built 2010 to 2019 | 0.7% ±1.3 pts | 5.5% |
| Built 1939 or earlier | 60.5% ±13.3 pts | 38.8% |
| Households with no vehicle | 21.6% ±11.3 pts | 26.6% |
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 8421 get to work?
42.5% of Census Tract 8421's workers drive alone. The average trip to work takes 34.5 minutes. The unemployment rate in 2020-2024 averaged 11.4%.
| Measure | Tract 8421 | Chicago |
|---|---|---|
| In the labor force (age 16+) | 62.6% ±10.4 pts | 67.6% |
| Unemployment rate | 11.4% ±7.5 pts | 8.0% |
| Drove alone to work | 42.5% ±11.9 pts | 44.7% |
| Carpooled | 15.1% ±10.8 pts | 7.3% |
| Public transportation | 32.4% ±8.5 pts | 17.7% |
| Walked | 0.0% ±1.3 pts | 5.8% |
| Worked from home | 8.6% ±6.5 pts | 21.0% |
| Mean travel time to work | 34.5 min ±4.9 | 33.1 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 8421 compare with the other tracts in Cook County?
Among Cook County's tracts with a reliable estimate, Census Tract 8421 ranks as shown below (1 = highest).
| Measure | In Cook County | In Chicago |
|---|---|---|
| Population | 81st of 1,328 | 40th of 789 |
| Residents per square mile | 745th of 1,331 | 644th of 792 |
| Median household income | 899th of 1,258 | 455th of 725 |
| Per capita income | 1,081st of 1,325 | 587th of 786 |
| Median home value | 976th of 1,279 | 572nd of 749 |
| Median gross rent | 1,182nd of 1,254 | 702nd of 758 |
| Poverty rate | 295th of 905 | 249th of 587 |
| Bachelor's degree or higher | 1,117th of 1,264 | 640th of 736 |
| Median age | 1,026th of 1,327 | 541st of 788 |
| Owner-occupied share | 685th of 1,300 | 246th of 762 |
The tracts next to it on Cook County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 8036.14 | 896th | $63,448±$9,745 · within the margin of this tract |
| Tract 7303 | 897th | $63,333±$26,088 · within the margin of this tract |
| Tract 8165 | 898th | $63,328±$9,423 · within the margin of this tract |
| Tract 8421 | 899th | $63,304±$7,665 |
| Tract 1904.02 | 900th | $63,140±$15,551 · within the margin of this tract |
| Tract 8206.05 | 901st | $63,137±$20,724 · within the margin of this tract |
| Tract 105.02 | 902nd | $63,125±$11,481 · within the margin of this tract |
| Tract 6715 | 902nd | $63,125±$25,270 · 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 8421?
3 of the 18 figures for Census Tract 8421 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