Census tract · Madison County
Census Tract 4020, Madison County, Illinois
Census Tract 4020, GEOID 17119402000, in Madison County, Illinois, mostly within Alton (98% of its census blocks). 4,303 residents in the ACS 2020-2024 5-year estimates (±580); the 2020 Census counted 4,086.
Residents, 2020-2024
4,303
±580 (90% margin)
2020 Census count: 4,086
Median household income
$55,104
±$14,529 (90% margin)
Madison County: $75,793
Median home value
$117,800
±$9,284 (90% margin)
Madison County: $173,000
Median gross rent
$971
±$317 (90% margin)
Madison County: $1,024
Where is Census Tract 4020?
Census Tract 4020 is one of 63 census tracts in Madison County, Illinois. It covers 2.50 square miles of land, 1,635 residents per square mile in 2020. Its GEOID, 17119402000, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Alton | 98% |
| Godfrey | 2% |
| Wood River Township | 1% |
7 census tracts border Census Tract 4020: Tract 4014 ($59,298), Tract 4015 ($63,385), Tract 4017.01 ($45,843), Tract 4021 ($38,688), Tract 4026 ($37,063), Tract 4027.01 ($69,044) and Tract 4028.01 ($105,938). 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 4020?
The 2020-2024 American Community Survey puts Census Tract 4020's population at 4,303 (±580) in 1,847 households; the 2020 Census counted 4,086 residents and 2,100 housing units.
| Measure | Tract 4020 | Alton |
|---|---|---|
| Total population | 4,303 ±580 | 25,279 |
| Households | 1,847 ±193 | 10,714 |
| Average household size | 2.30 ±0.24 | 2.30 |
| Housing units | 2,047 ±210 | 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 4020?
The median resident of Census Tract 4020 is 39.8 years old; 20.5% are under 18 and 20.6% are 65 or older. The largest group is non-Hispanic white residents at 67.6%, then non-Hispanic Black residents at 18.4%.
| Measure | Tract 4020 | Alton |
|---|---|---|
| Median age | 39.8 ±6.3 | 38.0 |
| Under 18 years | 20.5% ±5.8 pts | 23.1% |
| 65 years and over | 20.6% ±4.0 pts | 17.2% |
| Hispanic or Latino (any race) | 2.3% ±1.7 pts | 3.0% |
| White alone, not Hispanic | 67.6% ±11.3 pts | 68.7% |
| Black or African American alone, not Hispanic | 18.4% ±9.0 pts | 19.2% |
| Asian alone, not Hispanic | 5.0% ±6.6 pts | 1.4% |
| American Indian and Alaska Native alone, not Hispanic | 0.3% ±0.6 pts | 0.4% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.9 pts | 0.0% |
| Two or more races, not Hispanic | 5.5% ±3.8 pts | 6.7% |
| Some other race alone, not Hispanic | 0.9% ±1.1 pts | 0.6% |
| Born outside the United States | 5.5% ±3.8 pts | 2.6% |
| Speak a language other than English at home (age 5+) | 6.9% ±5.6 pts | 3.9% |
| Civilian veterans (age 18+) | 6.2% ±3.0 pts | 8.3% |
| With a disability | 19.4% ±4.7 pts | 21.4% |
| No health insurance coverage | 11.9% ±4.2 pts | 6.8% |
| High school graduate or higher (age 25+) | 90.4% ±4.3 pts | 91.3% |
| Bachelor's degree or higher (age 25+) | 23.5% ±5.8 pts | 21.5% |
| Graduate or professional degree (age 25+) | 6.9% ±2.3 pts | 8.2% |
| Lived in the same house a year earlier | 83.6% ±9.5 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 4020 earn?
Half of the 1,847 households in Census Tract 4020 earn less than $55,104 a year (±$14,529), against $75,793 across Madison County: 51st highest of the county's 63 tracts with a reliable estimate. 16.9% of residents live below the poverty line.
| Measure | Tract 4020 | Alton |
|---|---|---|
| Median household income | $55,104 ±$14,529 | $54,568 |
| Mean household income | $71,309 ±$10,407 | $67,596 |
| Per capita income | $31,408 ±$4,363 | $29,314 |
| People below the poverty line | 16.9% ±6.6 pts | 21.0% |
| Children under 18 below the poverty line | 10.7% ±14.8 pts | 27.9% |
| Households receiving SNAP | 20.8% ±7.9 pts | 27.4% |
| Households with a computer | 93.1% ±3.6 pts | 94.4% |
| Households with a broadband subscription | 90.2% ±3.9 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 4020?
Owners occupy 65.8% of Census Tract 4020's occupied homes and renters 34.2%. The median owner-occupied home is valued at $117,800 by its owner (±$9,284). The median renter pays $971 a month including utilities, and 30.0% of renters pay 35% or more of their income on rent.
| Measure | Tract 4020 | Alton |
|---|---|---|
| Median home value (owner-occupied) | $117,800 ±$9,284 | $103,700 |
| Median gross rent | $971 ±$317 | $1,015 |
| Renters paying 35% or more of income on rent | 30.0% ±14.2 pts | 38.8% |
| Median monthly owner costs, with a mortgage | $1,290 ±$172 | $1,149 |
| Owner-occupied homes | 65.8% ±8.1 pts | 59.9% |
| Renter-occupied homes | 34.2% ±8.1 pts | 40.1% |
| Housing units | 2,047 ±210 | 12,551 |
| Single-family detached homes | 80.1% ±6.1 pts | 75.3% |
| Mobile homes | 3.8% ±3.8 pts | 2.8% |
| Built 2020 or later | 0.6% ±1.0 pts | 0.5% |
| Built 2010 to 2019 | 1.4% ±1.8 pts | 1.9% |
| Built 1939 or earlier | 17.0% ±6.1 pts | 27.6% |
| Households with no vehicle | 12.5% ±6.1 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 4020 get to work?
81.7% of Census Tract 4020's workers drive alone. The average trip to work takes 20.3 minutes.
| Measure | Tract 4020 | Alton |
|---|---|---|
| In the labor force (age 16+) | 57.9% ±4.9 pts | 60.9% |
| Unemployment rate | 6.7% ±5.6 pts | 5.4% |
| Drove alone to work | 81.7% ±11.0 pts | 73.8% |
| Carpooled | 2.4% ±1.9 pts | 10.2% |
| Public transportation | 0.9% ±1.1 pts | 1.5% |
| Walked | 2.9% ±3.6 pts | 2.3% |
| Worked from home | 12.1% ±9.7 pts | 9.7% |
| Mean travel time to work | 20.3 min ±2.7 | 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 4020 compare with the other tracts in Madison County?
Among Madison County's tracts with a reliable estimate, Census Tract 4020 ranks as shown below (1 = highest).
| Measure | In Madison County | In Alton |
|---|---|---|
| Population | 27th of 63 | 1st of 11 |
| Residents per square mile | 28th of 63 | 8th of 11 |
| Median household income | 51st of 63 | 7th of 11 |
| Per capita income | 45th of 63 | 5th of 11 |
| Median home value | 41st of 63 | 4th of 11 |
| Median gross rent | 38th of 62 | 6th of 10 |
| Poverty rate | 16th of 49 | 6th of 9 |
| Bachelor's degree or higher | 36th of 61 | 6th of 11 |
| Median age | 33rd of 63 | 4th of 11 |
| Owner-occupied share | 43rd of 63 | 5th of 11 |
The tracts next to it on Madison County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4008.02 | 48th | $59,265±$4,411 · within the margin of this tract |
| Tract 4040 | 49th | $58,413±$7,798 · within the margin of this tract |
| Tract 4009.04 | 50th | $55,179±$18,482 · within the margin of this tract |
| Tract 4020 | 51st | $55,104±$14,529 |
| Tract 4001.02 | 52nd | $54,722±$16,841 · within the margin of this tract |
| Tract 4006 | 53rd | $54,659±$18,517 · within the margin of this tract |
| Tract 4009.03 | 54th | $54,350±$18,048 · 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 4020?
3 of the 18 figures for Census Tract 4020 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