Census tract · Warren County
Census Tract 8704, Warren County, Illinois
Census Tract 8704, GEOID 17187870400, in Warren County, Illinois, mostly within Monmouth Township (98% of its census blocks). 4,600 residents in the ACS 2020-2024 5-year estimates (±344); the 2020 Census counted 4,804.
Residents, 2020-2024
4,600
±344 (90% margin)
2020 Census count: 4,804
Median household income
$61,225
±$9,167 (90% margin)
Warren County: $67,385
Median home value
$105,500
±$10,943 (90% margin)
Warren County: $105,000
Median gross rent
$597
±$120 (90% margin)
Warren County: $788
Where is Census Tract 8704?
Census Tract 8704 is one of 5 census tracts in Warren County, Illinois. It covers 5.53 square miles of land, 869 residents per square mile in 2020. Its GEOID, 17187870400, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Monmouth Township | 98% |
| Monmouth | 88% |
| Hale Township | 2% |
3 census tracts border Census Tract 8704: Tract 8701 ($83,902), Tract 8703 ($65,000) and Tract 8705 ($63,345). 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 8704?
The 2020-2024 American Community Survey puts Census Tract 8704's population at 4,600 (±344) in 1,866 households; the 2020 Census counted 4,804 residents and 2,009 housing units.
| Measure | Tract 8704 | Monmouth Township |
|---|---|---|
| Total population | 4,600 ±344 | 9,727 |
| Households | 1,866 ±187 | 3,870 |
| Average household size | 2.03 ±0.14 | 2.26 |
| Housing units | 2,001 ±169 | 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 8704?
The median resident of Census Tract 8704 is 37.0 years old; 13.7% are under 18 and 19.6% are 65 or older. The largest group is non-Hispanic white residents at 80.6%, then Hispanic or Latino residents (of any race) at 11.9%. 6.4% of residents were born outside the United States.
| Measure | Tract 8704 | Monmouth Township |
|---|---|---|
| Median age | 37.0 ±2.9 | 35.7 |
| Under 18 years | 13.7% ±2.5 pts | 23.2% |
| 65 years and over | 19.6% ±4.0 pts | 18.9% |
| Hispanic or Latino (any race) | 11.9% ±2.8 pts | 16.7% |
| White alone, not Hispanic | 80.6% ±3.7 pts | 72.3% |
| Black or African American alone, not Hispanic | 5.1% ±3.6 pts | 3.9% |
| Asian alone, not Hispanic | 0.9% ±0.7 pts | 3.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.3% ±0.4 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.8 pts | 0.2% |
| Two or more races, not Hispanic | 1.2% ±1.1 pts | 2.6% |
| Some other race alone, not Hispanic | 0.0% ±0.8 pts | 0.4% |
| Born outside the United States | 6.4% ±2.2 pts | 9.8% |
| Speak a language other than English at home (age 5+) | 12.9% ±3.2 pts | 17.0% |
| Civilian veterans (age 18+) | 5.0% ±2.0 pts | 5.4% |
| With a disability | 15.6% ±3.7 pts | 14.8% |
| No health insurance coverage | 1.3% ±1.0 pts | 4.9% |
| High school graduate or higher (age 25+) | 88.0% ±4.8 pts | 84.1% |
| Bachelor's degree or higher (age 25+) | 20.0% ±5.0 pts | 21.2% |
| Graduate or professional degree (age 25+) | 7.6% ±3.2 pts | 7.7% |
| Lived in the same house a year earlier | 80.7% ±5.5 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 8704 earn?
Half of the 1,866 households in Census Tract 8704 earn less than $61,225 a year (±$9,167), against $67,385 across Warren County: 5th highest of the county's 5 tracts with a reliable estimate. 11.7% of residents live below the poverty line.
| Measure | Tract 8704 | Monmouth Township |
|---|---|---|
| Median household income | $61,225 ±$9,167 | $61,897 |
| Mean household income | $84,773 ±$15,402 | $81,648 |
| Per capita income | $34,558 ±$6,140 | $32,034 |
| People below the poverty line | 11.7% ±6.5 pts | 16.7% |
| Children under 18 below the poverty line | 23.3% ±21.8 pts | 31.3% |
| Households receiving SNAP | 21.6% ±7.0 pts | 20.6% |
| Households with a computer | 93.7% ±4.8 pts | 92.4% |
| Households with a broadband subscription | 88.5% ±5.2 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 8704?
Owners occupy 69.7% of Census Tract 8704's occupied homes and renters 30.3%. The median owner-occupied home is valued at $105,500 by its owner (±$10,943). The median renter pays $597 a month including utilities, and 17.9% of renters pay 35% or more of their income on rent.
| Measure | Tract 8704 | Monmouth Township |
|---|---|---|
| Median home value (owner-occupied) | $105,500 ±$10,943 | $100,600 |
| Median gross rent | $597 ±$120 | $733 |
| Renters paying 35% or more of income on rent | 17.9% ±11.0 pts | 26.4% |
| Median monthly owner costs, with a mortgage | $1,017 ±$157 | $1,011 |
| Owner-occupied homes | 69.7% ±6.0 pts | 70.7% |
| Renter-occupied homes | 30.3% ±6.0 pts | 29.3% |
| Housing units | 2,001 ±169 | 4,301 |
| Single-family detached homes | 74.5% ±6.2 pts | 81.4% |
| Mobile homes | 1.4% ±2.3 pts | 3.1% |
| Built 2020 or later | 1.6% ±2.4 pts | 0.8% |
| Built 2010 to 2019 | 0.7% ±1.0 pts | 0.6% |
| Built 1939 or earlier | 32.4% ±7.0 pts | 33.0% |
| Households with no vehicle | 14.4% ±4.7 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 8704 get to work?
72.6% of Census Tract 8704's workers drive alone and 9.3% work from home. The average trip to work takes 16.1 minutes.
| Measure | Tract 8704 | Monmouth Township |
|---|---|---|
| In the labor force (age 16+) | 61.4% ±5.2 pts | 61.6% |
| Unemployment rate | 2.7% ±2.7 pts | 3.2% |
| Drove alone to work | 72.6% ±6.2 pts | 76.1% |
| Carpooled | 9.0% ±3.7 pts | 7.1% |
| Public transportation | 0.7% ±1.1 pts | 1.1% |
| Walked | 8.1% ±3.9 pts | 6.5% |
| Worked from home | 9.3% ±3.7 pts | 7.4% |
| Mean travel time to work | 16.1 min ±3.0 | 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 8704 compare with the other tracts in Warren County?
Among Warren County's tracts with a reliable estimate, Census Tract 8704 ranks as shown below (1 = highest).
| Measure | In Warren County |
|---|---|
| Population | 2nd of 5 |
| Residents per square mile | 2nd of 5 |
| Median household income | 5th of 5 |
| Per capita income | 4th of 5 |
| Median home value | 3rd of 5 |
| Median gross rent | 5th of 5 |
| Poverty rate | 4th of 5 |
| Bachelor's degree or higher | 4th of 5 |
| Median age | 3rd of 5 |
| Owner-occupied share | 4th of 5 |
The tracts next to it on Warren County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| 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 · within the margin of this tract |
| Tract 8704 | 5th | $61,225±$9,167 |
"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 8704?
2 of the 18 figures for Census Tract 8704 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