Census tract · Rock Island County
Census Tract 231, Rock Island County, Illinois
Census Tract 231, GEOID 17161023100, in Rock Island County, Illinois, entirely within South Rock Island Township. 2,844 residents in the ACS 2020-2024 5-year estimates (±395); the 2020 Census counted 2,745.
Residents, 2020-2024
2,844
±395 (90% margin)
2020 Census count: 2,745
Median household income
$78,194
±$22,525 (90% margin)
Rock Island County: $67,159
Median home value
$167,500
±$15,435 (90% margin)
Rock Island County: $150,400
Median gross rent
$1,160
±$252 (90% margin)
Rock Island County: $889
Where is Census Tract 231?
Census Tract 231 is one of 43 census tracts in Rock Island County, Illinois. It covers 1.35 square miles of land, 2,033 residents per square mile in 2020. Its GEOID, 17161023100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| South Rock Island Township | 100% |
| Rock Island | 83% |
4 census tracts border Census Tract 231: Tract 230 ($100,422), Tract 232 ($72,872), Tract 243 ($47,328) and Tract 244 ($14,563). 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 231?
The 2020-2024 American Community Survey puts Census Tract 231's population at 2,844 (±395) in 1,269 households; the 2020 Census counted 2,745 residents and 1,188 housing units.
| Measure | Tract 231 | South Rock Island Township |
|---|---|---|
| Total population | 2,844 ±395 | 18,160 |
| Households | 1,269 ±131 | 8,754 |
| Average household size | 2.24 ±0.25 | 2.04 |
| Housing units | 1,277 ±130 | 9,033 |
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 231?
The median resident of Census Tract 231 is 39.5 years old; 22.4% are under 18 and 20.3% are 65 or older. The largest group is non-Hispanic white residents at 66.9%, then Hispanic or Latino residents (of any race) at 13.4%.
| Measure | Tract 231 | South Rock Island Township |
|---|---|---|
| Median age | 39.5 ±8.2 | 43.2 |
| Under 18 years | 22.4% ±6.2 pts | 20.3% |
| 65 years and over | 20.3% ±3.4 pts | 22.6% |
| Hispanic or Latino (any race) | 13.4% ±8.4 pts | 9.0% |
| White alone, not Hispanic | 66.9% ±11.4 pts | 70.6% |
| Black or African American alone, not Hispanic | 8.4% ±6.6 pts | 11.9% |
| Asian alone, not Hispanic | 7.7% ±6.5 pts | 5.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.4 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.3 pts | 0.0% |
| Two or more races, not Hispanic | 3.3% ±2.5 pts | 3.0% |
| Some other race alone, not Hispanic | 0.0% ±1.3 pts | 0.2% |
| Born outside the United States | 4.5% ±3.6 pts | 6.3% |
| Speak a language other than English at home (age 5+) | 12.4% ±8.2 pts | 9.5% |
| Civilian veterans (age 18+) | 7.5% ±2.5 pts | 8.5% |
| With a disability | 17.9% ±7.7 pts | 17.9% |
| No health insurance coverage | 1.8% ±1.1 pts | 5.9% |
| High school graduate or higher (age 25+) | 91.2% ±5.9 pts | 93.7% |
| Bachelor's degree or higher (age 25+) | 32.3% ±8.5 pts | 28.2% |
| Graduate or professional degree (age 25+) | 17.9% ±5.6 pts | 12.6% |
| Lived in the same house a year earlier | 97.1% ±2.5 pts | 89.5% |
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 231 earn?
Half of the 1,269 households in Census Tract 231 earn less than $78,194 a year (±$22,525), against $67,159 across Rock Island County: 12th highest of the county's 42 tracts with a reliable estimate.
| Measure | Tract 231 | South Rock Island Township |
|---|---|---|
| Median household income | $78,194 ±$22,525 | $69,711 |
| Mean household income | $114,406 ±$28,869 | $88,439 |
| Per capita income | $50,100 ±$13,444 | $42,505 |
| People below the poverty line | 10.9% ±7.2 pts | 12.4% |
| Children under 18 below the poverty line | 20.4% ±18.4 pts | 15.0% |
| Households receiving SNAP | 15.6% ±7.8 pts | 15.4% |
| Households with a computer | 97.4% ±2.5 pts | 95.9% |
| Households with a broadband subscription | 93.3% ±3.8 pts | 90.0% |
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 231?
Owners occupy 89.0% of Census Tract 231's occupied homes and renters 11.0%. The median owner-occupied home is valued at $167,500 by its owner (±$15,435). The median renter pays $1,160 a month including utilities.
| Measure | Tract 231 | South Rock Island Township |
|---|---|---|
| Median home value (owner-occupied) | $167,500 ±$15,435 | $139,000 |
| Median gross rent | $1,160 ±$252 | $834 |
| Renters paying 35% or more of income on rent | 0.0% ±36.9 pts | 29.0% |
| Median monthly owner costs, with a mortgage | $1,592 ±$158 | $1,317 |
| Owner-occupied homes | 89.0% ±6.0 pts | 72.7% |
| Renter-occupied homes | 11.0% ±6.0 pts | 27.3% |
| Housing units | 1,277 ±130 | 9,033 |
| Single-family detached homes | 95.4% ±5.4 pts | 76.0% |
| Mobile homes | 0.0% ±2.9 pts | 0.2% |
| Built 2020 or later | 0.0% ±2.9 pts | 0.0% |
| Built 2010 to 2019 | 0.6% ±1.1 pts | 2.6% |
| Built 1939 or earlier | 5.8% ±2.7 pts | 20.6% |
| Households with no vehicle | 1.8% ±1.7 pts | 9.2% |
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 231 get to work?
85.1% of Census Tract 231's workers drive alone and 7.9% work from home. The average trip to work takes 17.2 minutes.
| Measure | Tract 231 | South Rock Island Township |
|---|---|---|
| In the labor force (age 16+) | 62.9% ±5.7 pts | 62.7% |
| Unemployment rate | 10.2% ±9.5 pts | 6.0% |
| Drove alone to work | 85.1% ±6.3 pts | 79.0% |
| Carpooled | 4.1% ±3.2 pts | 5.9% |
| Public transportation | 0.0% ±2.9 pts | 1.6% |
| Walked | 0.0% ±2.9 pts | 1.5% |
| Worked from home | 7.9% ±4.0 pts | 10.8% |
| Mean travel time to work | 17.2 min ±1.5 | 20.1 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 231 compare with the other tracts in Rock Island County?
Among Rock Island County's tracts with a reliable estimate, Census Tract 231 ranks as shown below (1 = highest).
| Measure | In Rock Island County |
|---|---|
| Population | 25th of 43 |
| Residents per square mile | 25th of 43 |
| Median household income | 12th of 42 |
| Per capita income | 4th of 43 |
| Median home value | 12th of 43 |
| Median gross rent | 4th of 42 |
| Bachelor's degree or higher | 7th of 42 |
| Median age | 28th of 43 |
| Owner-occupied share | 4th of 43 |
The tracts next to it on Rock Island County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 218 | 9th | $87,733±$16,401 · within the margin of this tract |
| Tract 212 | 10th | $87,717±$15,216 · within the margin of this tract |
| Tract 215 | 11th | $79,405±$15,264 · within the margin of this tract |
| Tract 231 | 12th | $78,194±$22,525 |
| Tract 209 | 13th | $75,461±$13,808 · within the margin of this tract |
| Tract 232 | 14th | $72,872±$7,955 · within the margin of this tract |
| Tract 208 | 15th | $71,373±$4,209 · 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 231?
3 of the 18 figures for Census Tract 231 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