Census tract · DuPage County
Census Tract 8421, DuPage County, Illinois
Census Tract 8421, GEOID 17043842100, in DuPage County, Illinois, entirely within Milton Township. 5,925 residents in the ACS 2020-2024 5-year estimates (±667); the 2020 Census counted 5,891.
Residents, 2020-2024
5,925
±667 (90% margin)
2020 Census count: 5,891
Median household income
$140,750
±$39,803 (90% margin)
DuPage County: $112,096
Median home value
$502,200
±$48,720 (90% margin)
DuPage County: $391,400
Median gross rent
$1,419
±$358 (90% margin)
DuPage County: $1,688
Where is Census Tract 8421?
Census Tract 8421 is one of 219 census tracts in DuPage County, Illinois. It covers 1.51 square miles of land, 3,914 residents per square mile in 2020. Its GEOID, 17043842100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Milton Township | 100% |
| Glen Ellyn | 88% |
7 census tracts border Census Tract 8421: Tract 8417.06 ($83,107), Tract 8420 ($206,066), Tract 8422 ($138,095), Tract 8423 ($202,344), Tract 8427.06 ($165,083), Tract 8427.08 ($174,583) and Tract 8427.10 ($75,764). 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 5,925 (±667) in 2,239 households; the 2020 Census counted 5,891 residents and 2,270 housing units.
| Measure | Tract 8421 | Milton Township |
|---|---|---|
| Total population | 5,925 ±667 | 119,372 |
| Households | 2,239 ±300 | 43,954 |
| Average household size | 2.62 ±0.23 | 2.62 |
| Housing units | 2,413 ±279 | 45,740 |
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 42.1 years old; 28.1% are under 18 and 22.3% are 65 or older. The largest group is non-Hispanic white residents at 82.3%, then non-Hispanic Asian residents at 7.8%. 7.1% of residents were born outside the United States.
| Measure | Tract 8421 | Milton Township |
|---|---|---|
| Median age | 42.1 ±3.8 | 38.3 |
| Under 18 years | 28.1% ±3.5 pts | 23.4% |
| 65 years and over | 22.3% ±5.9 pts | 17.8% |
| Hispanic or Latino (any race) | 3.0% ±2.2 pts | 10.4% |
| White alone, not Hispanic | 82.3% ±5.6 pts | 70.3% |
| Black or African American alone, not Hispanic | 4.4% ±4.1 pts | 4.5% |
| Asian alone, not Hispanic | 7.8% ±5.2 pts | 10.0% |
| 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 | 2.5% ±2.3 pts | 4.1% |
| Some other race alone, not Hispanic | 0.0% ±0.6 pts | 0.5% |
| Born outside the United States | 7.1% ±3.8 pts | 14.8% |
| Speak a language other than English at home (age 5+) | 8.7% ±5.1 pts | 21.1% |
| Civilian veterans (age 18+) | 10.7% ±6.0 pts | 3.6% |
| With a disability | 8.4% ±2.7 pts | 8.6% |
| No health insurance coverage | 2.0% ±1.5 pts | 3.4% |
| High school graduate or higher (age 25+) | 97.1% ±1.6 pts | 94.7% |
| Bachelor's degree or higher (age 25+) | 67.4% ±8.1 pts | 61.3% |
| Graduate or professional degree (age 25+) | 27.7% ±6.5 pts | 26.0% |
| Lived in the same house a year earlier | 92.2% ±4.2 pts | 88.7% |
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 2,239 households in Census Tract 8421 earn less than $140,750 a year (±$39,803), against $112,096 across DuPage County: 57th highest of the county's 219 tracts with a reliable estimate. 5.6% of residents live below the poverty line.
| Measure | Tract 8421 | Milton Township |
|---|---|---|
| Median household income | $140,750 ±$39,803 | $121,087 |
| Mean household income | $168,179 ±$26,095 | $166,504 |
| Per capita income | $64,026 ±$6,634 | $62,166 |
| People below the poverty line | 5.6% ±3.2 pts | 6.8% |
| Children under 18 below the poverty line | 3.3% ±3.9 pts | 6.1% |
| Households receiving SNAP | 6.8% ±4.9 pts | 8.0% |
| Households with a computer | 91.5% ±9.8 pts | 97.4% |
| Households with a broadband subscription | 89.0% ±9.9 pts | 94.9% |
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 74.4% of Census Tract 8421's occupied homes and renters 25.6%. The median owner-occupied home is valued at $502,200 by its owner (±$48,720). The median renter pays $1,419 a month including utilities, and 31.6% of renters pay 35% or more of their income on rent.
| Measure | Tract 8421 | Milton Township |
|---|---|---|
| Median home value (owner-occupied) | $502,200 ±$48,720 | $469,400 |
| Median gross rent | $1,419 ±$358 | $1,563 |
| Renters paying 35% or more of income on rent | 31.6% ±19.8 pts | 35.2% |
| Median monthly owner costs, with a mortgage | $2,917 ±$404 | $2,819 |
| Owner-occupied homes | 74.4% ±9.4 pts | 72.2% |
| Renter-occupied homes | 25.6% ±9.4 pts | 27.8% |
| Housing units | 2,413 ±279 | 45,740 |
| Single-family detached homes | 65.9% ±8.7 pts | 59.8% |
| Mobile homes | 0.5% ±0.8 pts | 0.1% |
| Built 2020 or later | 0.7% ±1.1 pts | 0.6% |
| Built 2010 to 2019 | 8.0% ±8.4 pts | 4.0% |
| Built 1939 or earlier | 16.8% ±6.1 pts | 8.5% |
| Households with no vehicle | 9.2% ±4.5 pts | 6.4% |
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 8421 get to work?
61.7% of Census Tract 8421's workers drive alone and 23.4% work from home. The average trip to work takes 25.6 minutes. The unemployment rate in 2020-2024 averaged 8.2%.
| Measure | Tract 8421 | Milton Township |
|---|---|---|
| In the labor force (age 16+) | 63.2% ±7.2 pts | 65.7% |
| Unemployment rate | 8.2% ±4.8 pts | 4.6% |
| Drove alone to work | 61.7% ±7.2 pts | 59.4% |
| Carpooled | 5.1% ±4.2 pts | 6.3% |
| Public transportation | 8.1% ±4.5 pts | 4.5% |
| Walked | 1.0% ±1.7 pts | 3.0% |
| Worked from home | 23.4% ±6.0 pts | 25.5% |
| Mean travel time to work | 25.6 min ±2.8 | 27.1 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 DuPage County?
Among DuPage County's tracts with a reliable estimate, Census Tract 8421 ranks as shown below (1 = highest).
| Measure | In DuPage County |
|---|---|
| Population | 15th of 219 |
| Residents per square mile | 101st of 219 |
| Median household income | 57th of 219 |
| Per capita income | 70th of 219 |
| Median home value | 40th of 219 |
| Median gross rent | 151st of 195 |
| Poverty rate | 68th of 112 |
| Bachelor's degree or higher | 52nd of 219 |
| Median age | 80th of 219 |
| Owner-occupied share | 122nd of 219 |
The tracts next to it on DuPage County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 8465.18 | 54th | $143,424±$29,472 · within the margin of this tract |
| Tract 8429 | 55th | $143,016±$20,899 · within the margin of this tract |
| Tract 8449.02 | 56th | $142,639±$21,674 · within the margin of this tract |
| Tract 8421 | 57th | $140,750±$39,803 |
| Tract 8465.22 | 58th | $140,417±$16,372 · within the margin of this tract |
| Tract 8458.09 | 59th | $140,026±$14,971 · within the margin of this tract |
| Tract 8464.05 | 60th | $138,542±$46,375 · 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