Census tract · Warren County
Census Tract 8705, Warren County, Illinois
Census Tract 8705, GEOID 17187870500, in Warren County, Illinois, mostly within Monmouth Township (98% of its census blocks). 4,620 residents in the ACS 2020-2024 5-year estimates (±363); the 2020 Census counted 4,810.
Residents, 2020-2024
4,620
±363 (90% margin)
2020 Census count: 4,810
Median household income
$63,345
±$13,883 (90% margin)
Warren County: $67,385
Median home value
$78,600
±$7,141 (90% margin)
Warren County: $105,000
Median gross rent
$853
±$149 (90% margin)
Warren County: $788
Where is Census Tract 8705?
Census Tract 8705 is one of 5 census tracts in Warren County, Illinois. It covers 4.93 square miles of land, 976 residents per square mile in 2020. Its GEOID, 17187870500, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Monmouth Township | 98% |
| Monmouth | 86% |
| Lenox Township | 1% |
| Hale Township | 0% |
3 census tracts border Census Tract 8705: Tract 8701 ($83,902), Tract 8703 ($65,000) and Tract 8704 ($61,225). 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 8705?
The 2020-2024 American Community Survey puts Census Tract 8705's population at 4,620 (±363) in 1,779 households; the 2020 Census counted 4,810 residents and 2,076 housing units.
| Measure | Tract 8705 | Monmouth Township |
|---|---|---|
| Total population | 4,620 ±363 | 9,727 |
| Households | 1,779 ±219 | 3,870 |
| Average household size | 2.51 ±0.26 | 2.26 |
| Housing units | 2,121 ±195 | 4,301 |
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 8705?
The median resident of Census Tract 8705 is 33.7 years old; 31.6% are under 18 and 16.6% are 65 or older. The largest group is non-Hispanic white residents at 62.7%, then Hispanic or Latino residents (of any race) at 23.2%. 14.3% of residents were born outside the United States.
| Measure | Tract 8705 | Monmouth Township |
|---|---|---|
| Median age | 33.7 ±2.4 | 35.7 |
| Under 18 years | 31.6% ±3.9 pts | 23.2% |
| 65 years and over | 16.6% ±3.3 pts | 18.9% |
| Hispanic or Latino (any race) | 23.2% ±3.7 pts | 16.7% |
| White alone, not Hispanic | 62.7% ±4.9 pts | 72.3% |
| Black or African American alone, not Hispanic | 3.2% ±2.8 pts | 3.9% |
| Asian alone, not Hispanic | 6.8% ±2.0 pts | 3.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.1 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.5% ±0.7 pts | 0.2% |
| Two or more races, not Hispanic | 2.6% ±2.0 pts | 2.6% |
| Some other race alone, not Hispanic | 0.8% ±1.4 pts | 0.4% |
| Born outside the United States | 14.3% ±3.1 pts | 9.8% |
| Speak a language other than English at home (age 5+) | 23.0% ±4.8 pts | 17.0% |
| Civilian veterans (age 18+) | 5.6% ±2.4 pts | 5.4% |
| With a disability | 12.7% ±3.3 pts | 14.8% |
| No health insurance coverage | 9.0% ±4.4 pts | 4.9% |
| High school graduate or higher (age 25+) | 79.8% ±4.5 pts | 84.1% |
| Bachelor's degree or higher (age 25+) | 22.0% ±5.0 pts | 21.2% |
| Graduate or professional degree (age 25+) | 8.5% ±3.3 pts | 7.7% |
| Lived in the same house a year earlier | 88.4% ±5.0 pts | 85.2% |
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 8705 earn?
Half of the 1,779 households in Census Tract 8705 earn less than $63,345 a year (±$13,883), against $67,385 across Warren County: 4th highest of the county's 5 tracts with a reliable estimate. 20.9% of residents live below the poverty line.
| Measure | Tract 8705 | Monmouth Township |
|---|---|---|
| Median household income | $63,345 ±$13,883 | $61,897 |
| Mean household income | $76,474 ±$9,870 | $81,648 |
| Per capita income | $28,538 ±$3,879 | $32,034 |
| People below the poverty line | 20.9% ±6.2 pts | 16.7% |
| Children under 18 below the poverty line | 33.3% ±12.3 pts | 31.3% |
| Households receiving SNAP | 22.2% ±6.8 pts | 20.6% |
| Households with a computer | 93.5% ±3.3 pts | 92.4% |
| Households with a broadband subscription | 84.0% ±6.2 pts | 85.1% |
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 8705?
Owners occupy 68.1% of Census Tract 8705's occupied homes and renters 31.9%. The median owner-occupied home is valued at $78,600 by its owner (±$7,141). The median renter pays $853 a month including utilities, and 36.8% of renters pay 35% or more of their income on rent.
| Measure | Tract 8705 | Monmouth Township |
|---|---|---|
| Median home value (owner-occupied) | $78,600 ±$7,141 | $100,600 |
| Median gross rent | $853 ±$149 | $733 |
| Renters paying 35% or more of income on rent | 36.8% ±22.2 pts | 26.4% |
| Median monthly owner costs, with a mortgage | $891 ±$83 | $1,011 |
| Owner-occupied homes | 68.1% ±7.3 pts | 70.7% |
| Renter-occupied homes | 31.9% ±7.3 pts | 29.3% |
| Housing units | 2,121 ±195 | 4,301 |
| Single-family detached homes | 86.3% ±6.1 pts | 81.4% |
| Mobile homes | 4.9% ±3.3 pts | 3.1% |
| Built 2020 or later | 0.0% ±1.7 pts | 0.8% |
| Built 2010 to 2019 | 0.5% ±0.7 pts | 0.6% |
| Built 1939 or earlier | 35.4% ±7.0 pts | 33.0% |
| Households with no vehicle | 5.3% ±2.9 pts | 9.4% |
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 8705 get to work?
79.9% of Census Tract 8705's workers drive alone and 5.7% work from home. The average trip to work takes 14.4 minutes.
| Measure | Tract 8705 | Monmouth Township |
|---|---|---|
| In the labor force (age 16+) | 63.6% ±5.4 pts | 61.6% |
| Unemployment rate | 4.1% ±3.0 pts | 3.2% |
| Drove alone to work | 79.9% ±6.4 pts | 76.1% |
| Carpooled | 5.4% ±3.0 pts | 7.1% |
| Public transportation | 1.8% ±2.4 pts | 1.1% |
| Walked | 3.8% ±2.7 pts | 6.5% |
| Worked from home | 5.7% ±3.4 pts | 7.4% |
| Mean travel time to work | 14.4 min ±3.2 | 15.4 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 8705 compare with the other tracts in Warren County?
Among Warren County's tracts with a reliable estimate, Census Tract 8705 ranks as shown below (1 = highest).
| Measure | In Warren County |
|---|---|
| Population | 1st of 5 |
| Residents per square mile | 1st of 5 |
| Median household income | 4th of 5 |
| Per capita income | 5th of 5 |
| Median home value | 5th of 5 |
| Median gross rent | 3rd of 5 |
| Poverty rate | 1st of 5 |
| Bachelor's degree or higher | 3rd of 5 |
| Median age | 5th of 5 |
| Owner-occupied share | 5th of 5 |
The tracts next to it on Warren County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 8701 | 1st | $83,902±$7,408 |
| Tract 8702 | 2nd | $70,568±$12,485 · within the margin of this tract |
| Tract 8703 | 3rd | $65,000±$17,978 · within the margin of this tract |
| Tract 8705 | 4th | $63,345±$13,883 |
| Tract 8704 | 5th | $61,225±$9,167 · 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 8705?
1 of the 18 figures for Census Tract 8705 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