Boulder Hill vs Millbrook

A side-by-side comparison of Boulder Hill and Millbrook: population, income, housing, and more.

Boulder Hill and Millbrook are places in Illinois. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Boulder Hill has the higher population (9,127 vs 298 in Millbrook). Millbrook has the higher median household income ($128,750 vs $76,935 in Boulder Hill). Millbrook has the higher median home value ($350,000 vs $233,100 in Boulder Hill).

Population, income & housing

	Boulder Hill	Millbrook
Population	9,127	298
Median age	36.8 yrs	38.9 yrs
Median household income	$76,935	$128,750
Median home value	$233,100	$350,000
Median gross rent	$1,759	$1,100
Housing units	3,171	107
Homeownership rate	83.0%	94.1%
Bachelor's degree or higher	17.6%	42.1%
Unemployment rate	5.2%	2.6%

Trends (ACS 5-year, 2019–2023)

	Boulder Hill	Millbrook
Population	10,262 → 9,127 (-11.1%)	412 → 298 (-27.7%)
Median household income	$67,124 → $76,935 (+14.6%)	$85,938 → $128,750 (+49.8%)
Median home value	$161,400 → $233,100 (+44.4%)	$252,300 → $350,000 (+38.7%)
Median gross rent	$1,588 → $1,759 (+10.8%)	$1,038 → $1,100 (+6.0%)

Boulder Hill

Population

10,2629,127

Median household income

$67,124$76,935

Median home value

$161,400$233,100

Median gross rent

$1,588$1,759

Millbrook

Population

412298

Median household income

$85,938$128,750

Median home value

$252,300$350,000

Median gross rent

$1,038$1,100

Age & race/ethnicity

Age distribution (share)

	Boulder Hill	Millbrook
Under 5	5.9%	8.1%
5 to 17	18.0%	23.8%
18 to 24	10.7%	4.4%
25 to 34	13.0%	7.4%
35 to 44	15.4%	13.1%
45 to 54	12.3%	5.4%
55 to 64	9.4%	23.2%
65 to 74	9.2%	10.7%
75 and over	6.2%	4.0%

Race & ethnicity (share)

	Boulder Hill	Millbrook
White (non-Hispanic)	51.7%	98.7%
Black or African American	1.5%	0.0%
American Indian & Alaska Native	0.0%	0.0%
Asian	1.6%	0.0%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.0%
Two or more races	2.6%	0.7%
Hispanic or Latino	42.5%	0.7%

Educational attainment (age 25+)

Share of adults 25+

	Boulder Hill	Millbrook
No high school diploma	13.0%	3.7%
High school graduate	30.9%	15.3%
Some college or associate's	38.4%	38.9%
Bachelor's degree	13.1%	25.8%
Graduate or professional degree	4.5%	16.3%

Commute to work

How workers get to work (share)

	Boulder Hill	Millbrook
Drove alone	76.8%	92.4%
Carpooled	10.9%	2.8%
Public transit	0.0%	0.0%
Walked	0.5%	2.1%
Bicycle	0.0%	0.0%
Worked from home	10.6%	2.1%
Other means	1.2%	0.7%

Housing

Units in structure (share)

	Boulder Hill	Millbrook
1-unit, detached	90.9%	97.2%
1-unit, attached	3.1%	0.0%
2 to 4 units	2.6%	2.8%
5 to 19 units	1.1%	0.0%
20 or more units	1.3%	0.0%
Mobile home & other	1.0%	0.0%

Poverty & households

	Boulder Hill	Millbrook
Poverty rate	7.0%	6.7%
Average household size	3.04	2.92
Mean commute (minutes)	29	39
Median year structure built	1970	1985