Census tract · McHenry County
Census Tract 8710.03, McHenry County, Illinois
Census Tract 8710.03, GEOID 17111871003, in McHenry County, Illinois, mostly within Marengo Township (97% of its census blocks). 3,754 residents in the ACS 2020-2024 5-year estimates (±614); the 2020 Census counted 4,352.
Residents, 2020-2024
3,754
±614 (90% margin)
2020 Census count: 4,352
Median household income
$102,826
±$13,925 (90% margin)
McHenry County: $104,802
Median home value
$240,500
±$15,276 (90% margin)
McHenry County: $308,100
Median gross rent
$1,189
±$161 (90% margin)
McHenry County: $1,401
Where is Census Tract 8710.03?
Census Tract 8710.03 is one of 64 census tracts in McHenry County, Illinois. It covers 33.40 square miles of land, 130 residents per square mile in 2020. Its GEOID, 17111871003, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Marengo Township | 97% |
| Marengo | 70% |
| Seneca Township | 2% |
| Coral Township | 1% |
5 census tracts border Census Tract 8710.03: Tract 104 in Boone County ($87,066), Tract 105.02 in Boone County ($97,778), Tract 8702 ($95,294), Tract 8710.04 ($97,694) and Tract 8715.02 ($121,671). 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 8710.03?
The 2020-2024 American Community Survey puts Census Tract 8710.03's population at 3,754 (±614) in 1,558 households; the 2020 Census counted 4,352 residents and 1,752 housing units.
| Measure | Tract 8710.03 | Marengo Township |
|---|---|---|
| Total population | 3,754 ±614 | 7,253 |
| Households | 1,558 ±282 | 2,899 |
| Average household size | 2.41 ±0.14 | 2.48 |
| Housing units | 1,627 ±289 | 2,968 |
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 8710.03?
The median resident of Census Tract 8710.03 is 37.0 years old; 20.6% are under 18 and 18.1% are 65 or older. The largest group is non-Hispanic white residents at 90.0%, then Hispanic or Latino residents (of any race) at 5.0%.
| Measure | Tract 8710.03 | Marengo Township |
|---|---|---|
| Median age | 37.0 ±4.9 | 32.7 |
| Under 18 years | 20.6% ±2.3 pts | 24.2% |
| 65 years and over | 18.1% ±2.6 pts | 19.4% |
| Hispanic or Latino (any race) | 5.0% ±2.2 pts | 10.0% |
| White alone, not Hispanic | 90.0% ±4.5 pts | 85.2% |
| Black or African American alone, not Hispanic | 1.2% ±1.2 pts | 0.7% |
| Asian alone, not Hispanic | 0.0% ±1.0 pts | 0.1% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.0 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.0 pts | 0.0% |
| Two or more races, not Hispanic | 3.9% ±3.7 pts | 4.1% |
| Some other race alone, not Hispanic | 0.0% ±1.0 pts | 0.0% |
| Born outside the United States | 2.7% ±2.0 pts | 3.4% |
| Speak a language other than English at home (age 5+) | 6.8% ±3.1 pts | 9.9% |
| Civilian veterans (age 18+) | 3.7% ±2.3 pts | 4.9% |
| With a disability | 11.0% ±4.2 pts | 15.3% |
| No health insurance coverage | 3.0% ±1.9 pts | 3.9% |
| High school graduate or higher (age 25+) | 95.2% ±2.9 pts | 95.9% |
| Bachelor's degree or higher (age 25+) | 28.9% ±7.4 pts | 19.1% |
| Graduate or professional degree (age 25+) | 8.2% ±4.3 pts | 4.4% |
| Lived in the same house a year earlier | 83.7% ±7.0 pts | 78.7% |
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 8710.03 earn?
Half of the 1,558 households in Census Tract 8710.03 earn less than $102,826 a year (±$13,925), against $104,802 across McHenry County: 36th highest of the county's 64 tracts with a reliable estimate. 10.0% of residents live below the poverty line.
| Measure | Tract 8710.03 | Marengo Township |
|---|---|---|
| Median household income | $102,826 ±$13,925 | $74,172 |
| Mean household income | $110,540 ±$13,478 | $93,280 |
| Per capita income | $45,854 ±$5,600 | $38,127 |
| People below the poverty line | 10.0% ±5.8 pts | 13.2% |
| Children under 18 below the poverty line | 13.1% ±11.6 pts | 18.4% |
| Households receiving SNAP | 12.8% ±6.5 pts | 19.2% |
| Households with a computer | 98.8% ±1.8 pts | 94.7% |
| Households with a broadband subscription | 97.1% ±2.4 pts | 95.7% |
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 8710.03?
Owners occupy 76.4% of Census Tract 8710.03's occupied homes and renters 23.6%. The median owner-occupied home is valued at $240,500 by its owner (±$15,276). The median renter pays $1,189 a month including utilities, and 41.4% of renters pay 35% or more of their income on rent.
| Measure | Tract 8710.03 | Marengo Township |
|---|---|---|
| Median home value (owner-occupied) | $240,500 ±$15,276 | $234,900 |
| Median gross rent | $1,189 ±$161 | $1,152 |
| Renters paying 35% or more of income on rent | 41.4% ±19.8 pts | 53.5% |
| Median monthly owner costs, with a mortgage | $1,707 ±$104 | $1,670 |
| Owner-occupied homes | 76.4% ±7.7 pts | 62.1% |
| Renter-occupied homes | 23.6% ±7.7 pts | 37.9% |
| Housing units | 1,627 ±289 | 2,968 |
| Single-family detached homes | 86.0% ±6.0 pts | 62.5% |
| Mobile homes | 0.0% ±2.3 pts | 7.3% |
| Built 2020 or later | 0.0% ±2.3 pts | 0.0% |
| Built 2010 to 2019 | 5.7% ±4.9 pts | 3.1% |
| Built 1939 or earlier | 17.7% ±5.4 pts | 22.7% |
| Households with no vehicle | 5.5% ±5.4 pts | 5.8% |
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 8710.03 get to work?
77.1% of Census Tract 8710.03's workers drive alone and 12.3% work from home. The average trip to work takes 32.2 minutes.
| Measure | Tract 8710.03 | Marengo Township |
|---|---|---|
| In the labor force (age 16+) | 65.9% ±6.3 pts | 61.6% |
| Unemployment rate | 6.4% ±5.3 pts | 8.8% |
| Drove alone to work | 77.1% ±6.1 pts | 79.5% |
| Carpooled | 8.8% ±4.6 pts | 10.6% |
| Public transportation | 0.0% ±2.0 pts | 0.0% |
| Walked | 0.6% ±0.8 pts | 0.3% |
| Worked from home | 12.3% ±4.4 pts | 8.8% |
| Mean travel time to work | 32.2 min ±3.4 | 30.7 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 8710.03 compare with the other tracts in McHenry County?
Among McHenry County's tracts with a reliable estimate, Census Tract 8710.03 ranks as shown below (1 = highest).
| Measure | In McHenry County |
|---|---|
| Population | 56th of 64 |
| Residents per square mile | 62nd of 64 |
| Median household income | 36th of 64 |
| Per capita income | 40th of 64 |
| Median home value | 54th of 64 |
| Median gross rent | 47th of 55 |
| Poverty rate | 9th of 30 |
| Bachelor's degree or higher | 41st of 64 |
| Median age | 53rd of 64 |
| Owner-occupied share | 47th of 64 |
The tracts next to it on McHenry County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 8704.03 | 33rd | $105,078±$15,292 · within the margin of this tract |
| Tract 8707.04 | 34th | $104,236±$19,341 · within the margin of this tract |
| Tract 8716 | 35th | $103,819±$9,574 · within the margin of this tract |
| Tract 8710.03 | 36th | $102,826±$13,925 |
| Tract 8708.10 | 37th | $101,116±$14,215 · within the margin of this tract |
| Tract 8706.05 | 38th | $100,380±$14,421 · within the margin of this tract |
| Tract 8711.15 | 39th | $99,800±$46,731 · 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 8710.03?
2 of the 18 figures for Census Tract 8710.03 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