Census tract · Cook County
Census Tract 3109, Cook County, Illinois
Census Tract 3109, GEOID 17031310900, in Cook County, Illinois, entirely within Chicago. 4,998 residents in the ACS 2020-2024 5-year estimates (±733); the 2020 Census counted 4,781.
Residents, 2020-2024
4,998
±733 (90% margin)
2020 Census count: 4,781
Median household income
$84,571
±$18,225 (90% margin)
Cook County: $83,498
Median home value
$271,200
±$46,743 (90% margin)
Cook County: $324,500
Median gross rent
$1,366
±$163 (90% margin)
Cook County: $1,435
Where is Census Tract 3109?
Census Tract 3109 is one of 1,332 census tracts in Cook County, Illinois. It covers 0.19 square miles of land, 25,567 residents per square mile in 2020. Its GEOID, 17031310900, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Chicago | 100% |
4 census tracts border Census Tract 3109: Tract 3108 ($69,435), Tract 8412 ($71,250), Tract 8429 ($29,363) and Tract 8432 ($74,764). 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 3109?
The 2020-2024 American Community Survey puts Census Tract 3109's population at 4,998 (±733) in 1,926 households; the 2020 Census counted 4,781 residents and 2,101 housing units.
| Measure | Tract 3109 | Chicago |
|---|---|---|
| Total population | 4,998±733 | 2,711,226 |
| Households | 1,926±206 | 1,160,205 |
| Average household size | 2.59±0.27 | 2.29 |
| Housing units | 2,208±200 | 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 3109?
The median resident of Census Tract 3109 is 34.1 years old; 23.2% are under 18 and 14.0% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 77.1%, then non-Hispanic white residents at 14.9%. 32.6% of residents were born outside the United States.
| Measure | Tract 3109 | Chicago |
|---|---|---|
| Median age | 34.1±2.2 | 35.8 |
| Under 18 years | 23.2%±5.1 pts | 19.4% |
| 65 years and over | 14.0%±5.0 pts | 13.8% |
| Hispanic or Latino (any race) | 77.1%±6.2 pts | 29.7% |
| White alone, not Hispanic | 14.9%±5.1 pts | 32.1% |
| Black or African American alone, not Hispanic | 1.6%±1.5 pts | 27.4% |
| Asian alone, not Hispanic | 4.8%±3.1 pts | 7.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.7 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 1.6%±1.3 pts | 3.0% |
| Some other race alone, not Hispanic | 0.0%±0.7 pts | 0.4% |
| Born outside the United States | 32.6%±6.9 pts | 20.9% |
| Speak a language other than English at home (age 5+) | 73.4%±7.3 pts | 35.4% |
| Civilian veterans (age 18+) | 3.4%±2.4 pts | 2.8% |
| With a disability | 15.2%±4.3 pts | 12.1% |
| No health insurance coverage | 8.9%±4.4 pts | 9.8% |
| High school graduate or higher (age 25+) | 76.0%±7.2 pts | 87.2% |
| Bachelor's degree or higher (age 25+) | 38.1%±8.2 pts | 44.3% |
| Graduate or professional degree (age 25+) | 16.9%±6.4 pts | 19.0% |
| Lived in the same house a year earlier | 90.7%±5.1 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 3109 earn?
Half of the 1,926 households in Census Tract 3109 earn less than $84,571 a year (±$18,225), against $83,498 across Cook County: 583rd highest of the county's 1,258 tracts with a reliable estimate. 24.9% of residents live below the poverty line.
| Measure | Tract 3109 | Chicago |
|---|---|---|
| Median household income | $84,571±$18,225 | $77,902 |
| Mean household income | $112,315±$27,570 | $116,016 |
| Per capita income | $40,927±$10,153 | $50,086 |
| People below the poverty line | 24.9%±10.9 pts | 16.8% |
| Children under 18 below the poverty line | 48.1%±21.5 pts | 23.6% |
| Households receiving SNAP | 21.5%±6.2 pts | 18.9% |
| Households with a computer | 95.3%±4.2 pts | 94.9% |
| Households with a broadband subscription | 90.1%±5.3 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 3109?
Owners occupy 39.4% of Census Tract 3109's occupied homes and renters 60.6%. The median owner-occupied home is valued at $271,200 by its owner (±$46,743). The median renter pays $1,366 a month including utilities, and 29.3% of renters pay 35% or more of their income on rent.
| Measure | Tract 3109 | Chicago |
|---|---|---|
| Median home value (owner-occupied) | $271,200±$46,743 | $334,100 |
| Median gross rent | $1,366±$163 | $1,440 |
| Renters paying 35% or more of income on rent | 29.3%±11.5 pts | 39.3% |
| Median monthly owner costs, with a mortgage | $2,227±$165 | $2,339 |
| Owner-occupied homes | 39.4%±8.9 pts | 46.0% |
| Renter-occupied homes | 60.6%±8.9 pts | 54.0% |
| Housing units | 2,208±200 | 1,277,054 |
| Single-family detached homes | 15.0%±7.0 pts | 25.6% |
| Mobile homes | 0.0%±1.7 pts | 0.2% |
| Built 2020 or later | 0.0%±1.7 pts | 0.8% |
| Built 2010 to 2019 | 7.5%±5.5 pts | 5.5% |
| Built 1939 or earlier | 56.3%±9.7 pts | 38.8% |
| Households with no vehicle | 21.8%±7.6 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 3109 get to work?
54.7% of Census Tract 3109's workers drive alone and 10.2% work from home. The average trip to work takes 29.8 minutes.
| Measure | Tract 3109 | Chicago |
|---|---|---|
| In the labor force (age 16+) | 67.3%±6.6 pts | 67.6% |
| Unemployment rate | 8.5%±5.6 pts | 8.0% |
| Drove alone to work | 54.7%±8.0 pts | 44.7% |
| Carpooled | 8.2%±5.0 pts | 7.3% |
| Public transportation | 21.6%±5.9 pts | 17.7% |
| Walked | 3.3%±2.4 pts | 5.8% |
| Worked from home | 10.2%±5.3 pts | 21.0% |
| Mean travel time to work | 29.8 min±2.7 | 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 3109 compare with the other tracts in Cook County?
Among Cook County's tracts with a reliable estimate, Census Tract 3109 ranks as shown below (1 = highest).
| Measure | In Cook County | In Chicago |
|---|---|---|
| Population | 344th of 1,328 | 143rd of 789 |
| Residents per square mile | 184th of 1,331 | 180th of 792 |
| Median household income | 583rd of 1,258 | 277th of 725 |
| Per capita income | 653rd of 1,325 | 354th of 786 |
| Median home value | 794th of 1,279 | 469th of 749 |
| Median gross rent | 673rd of 1,254 | 369th of 758 |
| Poverty rate | 221st of 905 | 194th of 587 |
| Bachelor's degree or higher | 648th of 1,264 | 376th of 736 |
| Median age | 973rd of 1,327 | 498th of 788 |
| Owner-occupied share | 992nd of 1,300 | 483rd of 762 |
The tracts next to it on Cook County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 7706.02 | 580th | $85,089±$27,737 · within the margin of this tract |
| Tract 8397 | 581st | $85,030±$13,983 · within the margin of this tract |
| Tract 8201.04 | 582nd | $84,615±$15,906 · within the margin of this tract |
| Tract 3109 | 583rd | $84,571±$18,225 |
| Tract 8246.01 | 584th | $84,519±$21,083 · within the margin of this tract |
| Tract 8051.05 | 585th | $84,474±$9,494 · within the margin of this tract |
| Tract 2301 | 586th | $84,453±$31,215 · 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 3109?
1 of the 18 figures for Census Tract 3109 on this page carries a coefficient of variation over 40% and is 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