Census tract · Madison County
Census Tract 4021, Madison County, Illinois
Census Tract 4021, GEOID 17119402100, in Madison County, Illinois, entirely within Alton. 2,092 residents in the ACS 2020-2024 5-year estimates (±313); the 2020 Census counted 3,061.
Residents, 2020-2024
2,092
±313 (90% margin)
2020 Census count: 3,061
Median household income
$38,688
±$15,764 (90% margin)
Madison County: $75,793
Median home value
$100,600
±$13,113 (90% margin)
Madison County: $173,000
Median gross rent
$912
±$215 (90% margin)
Madison County: $1,024
Where is Census Tract 4021?
Census Tract 4021 is one of 63 census tracts in Madison County, Illinois. It covers 1.68 square miles of land, 1,821 residents per square mile in 2020. Its GEOID, 17119402100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Alton | 100% |
6 census tracts border Census Tract 4021: Tract 4020 ($55,104), Tract 4022 ($63,730), Tract 4024 ($39,531), Tract 4025 ($68,750), Tract 4026 ($37,063) and Tract 4027.01 ($69,044). 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 4021?
The 2020-2024 American Community Survey puts Census Tract 4021's population at 2,092 (±313) in 947 households; the 2020 Census counted 3,061 residents and 1,456 housing units.
| Measure | Tract 4021 | Alton |
|---|---|---|
| Total population | 2,092 ±313 | 25,279 |
| Households | 947 ±113 | 10,714 |
| Average household size | 2.09 ±0.26 | 2.30 |
| Housing units | 1,291 ±190 | 12,551 |
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 4021?
The median resident of Census Tract 4021 is 51.5 years old; 14.5% are under 18 and 30.1% are 65 or older. The largest group is non-Hispanic white residents at 60.5%, then non-Hispanic Black residents at 36.1%.
| Measure | Tract 4021 | Alton |
|---|---|---|
| Median age | 51.5 ±3.2 | 38.0 |
| Under 18 years | 14.5% ±5.8 pts | 23.1% |
| 65 years and over | 30.1% ±6.6 pts | 17.2% |
| Hispanic or Latino (any race) | 1.6% ±1.8 pts | 3.0% |
| White alone, not Hispanic | 60.5% ±11.6 pts | 68.7% |
| Black or African American alone, not Hispanic | 36.1% ±11.0 pts | 19.2% |
| Asian alone, not Hispanic | 0.0% ±1.8 pts | 1.4% |
| American Indian and Alaska Native alone, not Hispanic | 1.4% ±2.3 pts | 0.4% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.8 pts | 0.0% |
| Two or more races, not Hispanic | 0.4% ±0.5 pts | 6.7% |
| Some other race alone, not Hispanic | 0.0% ±1.8 pts | 0.6% |
| Born outside the United States | 2.3% ±2.0 pts | 2.6% |
| Speak a language other than English at home (age 5+) | 4.6% ±3.5 pts | 3.9% |
| Civilian veterans (age 18+) | 11.9% ±3.7 pts | 8.3% |
| With a disability | 32.1% ±6.1 pts | 21.4% |
| No health insurance coverage | 5.2% ±4.0 pts | 6.8% |
| High school graduate or higher (age 25+) | 87.1% ±9.4 pts | 91.3% |
| Bachelor's degree or higher (age 25+) | 18.4% ±5.5 pts | 21.5% |
| Graduate or professional degree (age 25+) | 5.8% ±2.4 pts | 8.2% |
| Lived in the same house a year earlier | 92.5% ±5.9 pts | 85.6% |
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 4021 earn?
Half of the 947 households in Census Tract 4021 earn less than $38,688 a year (±$15,764), against $75,793 across Madison County: 61st highest of the county's 63 tracts with a reliable estimate. 28.0% of residents live below the poverty line.
| Measure | Tract 4021 | Alton |
|---|---|---|
| Median household income | $38,688 ±$15,764 | $54,568 |
| Mean household income | $53,572 ±$11,006 | $67,596 |
| Per capita income | $25,753 ±$5,464 | $29,314 |
| People below the poverty line | 28.0% ±12.9 pts | 21.0% |
| Children under 18 below the poverty line | 32.9% ±32.6 pts | 27.9% |
| Households receiving SNAP | 33.2% ±11.4 pts | 27.4% |
| Households with a computer | 86.5% ±7.4 pts | 94.4% |
| Households with a broadband subscription | 85.2% ±7.2 pts | 90.5% |
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 4021?
Owners occupy 74.8% of Census Tract 4021's occupied homes and renters 25.2%. The median owner-occupied home is valued at $100,600 by its owner (±$13,113). The median renter pays $912 a month including utilities, and 37.6% of renters pay 35% or more of their income on rent.
| Measure | Tract 4021 | Alton |
|---|---|---|
| Median home value (owner-occupied) | $100,600 ±$13,113 | $103,700 |
| Median gross rent | $912 ±$215 | $1,015 |
| Renters paying 35% or more of income on rent | 37.6% ±22.5 pts | 38.8% |
| Median monthly owner costs, with a mortgage | $1,033 ±$143 | $1,149 |
| Owner-occupied homes | 74.8% ±9.5 pts | 59.9% |
| Renter-occupied homes | 25.2% ±9.5 pts | 40.1% |
| Housing units | 1,291 ±190 | 12,551 |
| Single-family detached homes | 84.7% ±6.3 pts | 75.3% |
| Mobile homes | 0.0% ±2.9 pts | 2.8% |
| Built 2020 or later | 0.0% ±2.9 pts | 0.5% |
| Built 2010 to 2019 | 0.0% ±2.9 pts | 1.9% |
| Built 1939 or earlier | 20.5% ±8.2 pts | 27.6% |
| Households with no vehicle | 18.8% ±8.2 pts | 10.4% |
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 4021 get to work?
61.7% of Census Tract 4021's workers drive alone and 22.8% work from home. The average trip to work takes 18.5 minutes. The unemployment rate in 2020-2024 averaged 14.4%.
| Measure | Tract 4021 | Alton |
|---|---|---|
| In the labor force (age 16+) | 50.6% ±7.2 pts | 60.9% |
| Unemployment rate | 14.4% ±8.5 pts | 5.4% |
| Drove alone to work | 61.7% ±15.0 pts | 73.8% |
| Carpooled | 2.4% ±3.7 pts | 10.2% |
| Public transportation | 4.9% ±4.3 pts | 1.5% |
| Walked | 5.4% ±6.4 pts | 2.3% |
| Worked from home | 22.8% ±12.3 pts | 9.7% |
| Mean travel time to work | 18.5 min ±5.2 | 22.7 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 4021 compare with the other tracts in Madison County?
Among Madison County's tracts with a reliable estimate, Census Tract 4021 ranks as shown below (1 = highest).
| Measure | In Madison County | In Alton |
|---|---|---|
| Population | 55th of 63 | 8th of 11 |
| Residents per square mile | 25th of 63 | 6th of 11 |
| Median household income | 61st of 63 | 10th of 11 |
| Per capita income | 56th of 63 | 8th of 11 |
| Median home value | 49th of 63 | 7th of 11 |
| Median gross rent | 45th of 62 | 8th of 10 |
| Poverty rate | 4th of 49 | 3rd of 9 |
| Bachelor's degree or higher | 42nd of 61 | 8th of 11 |
| Median age | 4th of 63 | 2nd of 11 |
| Owner-occupied share | 29th of 63 | 2nd of 11 |
The tracts next to it on Madison County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4017.01 | 58th | $45,843±$11,055 · within the margin of this tract |
| Tract 4002 | 59th | $43,314±$8,329 · within the margin of this tract |
| Tract 4024 | 60th | $39,531±$15,497 · within the margin of this tract |
| Tract 4021 | 61st | $38,688±$15,764 |
| Tract 4026 | 62nd | $37,063±$20,987 · within the margin of this tract |
| Tract 4007 | 63rd | $32,066±$8,551 · 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 4021?
2 of the 18 figures for Census Tract 4021 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