Census-designated place · Illinois
Boulder Hill, Illinois
Boulder Hill, census-designated place, in Kendall County, Illinois. Boulder Hill had 8,989 people in the ACS 2020-2024 5-year estimates (±748). GEOID 1707419.
Residents, 2020-2024
8,989
±748 (90% margin)
2020 Census count: 8,394
Median household income
$80,377
±$7,541 (90% margin)
Illinois: $83,390
Median home value
$238,700
±$7,415 (90% margin)
Illinois: $263,300
Median gross rent
$1,633
±$112 (90% margin)
Illinois: $1,274
Where is Boulder Hill and what county is it in?
Boulder Hill is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Kendall County, Illinois. It covers 1.5 square miles of land, 5,757 residents per square mile in 2020.
Boulder Hill is in the Chicago-Naperville-Elgin, IL-IN metropolitan statistical area, which takes in 13 counties (Census Bureau delineation, July 2023).
Boulder Hill lies entirely within Oswego Township, a township with its own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Boulder Hill, and is it growing?
The 2020-2024 American Community Survey puts Boulder Hill's population at 8,989 (±748). The 2020 Census counted 8,394 residents.
The Census Bureau publishes yearly population estimates for incorporated places only; Boulder Hill is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Boulder Hill | Kendall County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 8,989 ±748 | 137,675 | −1,273 |
| Households | 2,998 ±302 | 45,372 | no clear change |
| Average household size | 3.00 ±0.23 | 3.03 | no clear change |
| Housing units | 3,124 ±310 | 46,589 | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Boulder Hill?
The median resident of Boulder Hill is 37.6 years old; 21.8% are under 18 and 14.8% are 65 or older. The largest group is non-Hispanic white residents at 48.9%, then Hispanic or Latino residents (of any race) at 43.8%. 16.8% of residents were born outside the United States.
| Measure | Boulder Hill | Kendall County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 37.6 ±2.2 | 36.3 | +4.0 |
| Under 18 years | 21.8% ±3.2 pts | 27.0% | – |
| 65 years and over | 14.8% ±3.0 pts | 11.2% | – |
| Male | 49.3% ±3.6 pts | 50.0% | – |
| Hispanic or Latino (any race) | 43.8% ±4.7 pts | 22.4% | +13.9 pts |
| White alone, not Hispanic | 48.9% ±5.2 pts | 62.0% | −15.1 pts |
| Black or African American alone, not Hispanic | 2.2% ±1.4 pts | 7.6% | no clear change |
| Asian alone, not Hispanic | 1.7% ±1.5 pts | 3.5% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.2 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.2% ±1.4 pts | 3.9% | – |
| Some other race alone, not Hispanic | 0.0% ±0.4 pts | 0.4% | – |
| Born outside the United States | 16.8% ±3.9 pts | 11.4% | +10.9 pts |
| Speak a language other than English at home (age 5+) | 35.9% ±6.1 pts | 21.8% | – |
| Civilian veterans (age 18+) | 3.4% ±1.3 pts | 4.5% | – |
| With a disability | 11.0% ±3.1 pts | 8.2% | – |
| No health insurance coverage | 5.9% ±2.2 pts | 4.0% | no clear change |
| High school graduate or higher (age 25+) | 88.9% ±3.1 pts | 94.0% | – |
| Bachelor's degree or higher (age 25+) | 19.2% ±4.1 pts | 36.9% | no clear change |
| Graduate or professional degree (age 25+) | 5.7% ±2.0 pts | 12.7% | – |
| Lived in the same house a year earlier | 90.0% ±4.3 pts | 91.6% | – |
| Moved from another state in the past year | 0.0% ±0.4 pts | 0.5% | – |
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 Boulder Hill earn?
Half of Boulder Hill's 2,998 households earn less than $80,377 a year (±$7,541), against $111,601 in Kendall County and $83,390 in Illinois. In 2015-2019 it was $82,609 in 2024 dollars; the margins of error cannot tell the two periods apart. 8.8% of residents live below the poverty line.
| Measure | Boulder Hill | Kendall County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $80,377 ±$7,541 | $111,601 | no clear change |
| Mean household income | $97,691 ±$10,644 | $129,379 | – |
| Per capita income | $34,831 ±$4,135 | $44,141 | no clear change |
| People below the poverty line | 8.8% ±4.2 pts | 5.4% | no clear change |
| Children under 18 below the poverty line | 16.2% ±10.5 pts | 7.3% | – |
| Households receiving SNAP | 13.4% ±5.7 pts | 8.6% | – |
| Households with a computer | 95.5% ±2.5 pts | 98.3% | – |
| Households with a broadband subscription | 93.3% ±2.9 pts | 95.6% | – |
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 Boulder Hill?
Owners occupy 86.3% of Boulder Hill's occupied homes and renters 13.7%. The median owner-occupied home is valued at $238,700 by its owner (±$7,415). The median renter pays $1,633 a month including utilities, and 48.0% of renters pay 35% or more of their income on rent.
| Measure | Boulder Hill | Kendall County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $238,700 ±$7,415 | $322,400 | +$40,066 |
| Median gross rent | $1,633 ±$112 | $1,781 | −$321 |
| Renters paying 35% or more of income on rent | 48.0% ±18.0 pts | 36.1% | no clear change |
| Median monthly owner costs, with a mortgage | $1,734 ±$89 | $2,264 | – |
| Owner-occupied homes | 86.3% ±4.1 pts | 84.0% | +7.5 pts |
| Renter-occupied homes | 13.7% ±4.1 pts | 16.0% | – |
| Housing units | 3,124 ±310 | 46,589 | no clear change |
| Homeowner vacancy rate | 0.7% ±1.0 pts | 0.8% | – |
| Rental vacancy rate | 0.0% ±8.4 pts | 2.8% | – |
| Single-family detached homes | 91.4% ±2.7 pts | 73.9% | – |
| Mobile homes | 0.8% ±0.9 pts | 0.2% | – |
| Built 2020 or later | 0.0% ±1.2 pts | 3.1% | – |
| Built 2010 to 2019 | 0.0% ±1.2 pts | 10.3% | – |
| Built 1939 or earlier | 1.2% ±1.4 pts | 4.0% | – |
| Households with no vehicle | 0.8% ±0.7 pts | 2.2% | – |
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 Boulder Hill work and get to work?
71.6% of Boulder Hill's workers drive alone and 11.3% work from home. The average trip to work takes 27.4 minutes. The unemployment rate in 2020-2024 averaged 10.4%.
| Measure | Boulder Hill | Kendall County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 72.9% ±4.1 pts | 72.7% | – |
| Unemployment rate | 10.4% ±3.6 pts | 4.3% | no clear change |
| Drove alone to work | 71.6% ±5.2 pts | 76.5% | – |
| Carpooled | 15.6% ±4.4 pts | 6.4% | – |
| Public transportation | 0.0% ±0.8 pts | 1.0% | – |
| Walked | 0.2% ±0.4 pts | 0.6% | – |
| Worked from home | 11.3% ±3.2 pts | 14.7% | +5.7 pts |
| Mean travel time to work | 27.4 min ±2.1 | 31.6 min | no clear change |
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 census tracts are in Boulder Hill?
2 census tracts lie mostly in Boulder Hill, and 1 more reaches into it (2020 census blocks). Their median household incomes run from $75,225 (Tract 8902.01) to $93,295 (Tract 8902.02).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 8902.02Kendall County | 3,700 | $93,295 |
| Tract 8902.01Kendall County | 4,548 | $75,225 |
| Tract 8903.02Kendall County | 5,500 | $95,239 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Boulder Hill) · Census block assignment files
How does Boulder Hill compare with other places in Illinois?
Boulder Hill ranks 643rd of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 407th | 1,383 |
| Residents per square mile | 32nd | 1,383 |
| Median household income | 643rd | 1,380 |
| Per capita income | 900th | 1,383 |
| Median home value | 422nd | 1,379 |
| Median gross rent | 147th | 1,280 |
| Poverty rate | 655th | 1,119 |
| Bachelor's degree or higher | 929th | 1,369 |
| Median age | 1,086th | 1,383 |
| Owner-occupied share | 313th | 1,382 |
| Work from home | 490th | 1,015 |
| Travel time to work | 519th | 1,382 |
Boulder Hill's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Boulder Hill with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Boulder Hill?
14 of the 57 figures for Boulder Hill 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.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. 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 · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Boulder Hill are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.