Romeoville, Illinois demographics

Romeoville, IL demographics: median age 35.5; 28.3% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Romeoville village, Illinois · Incorporated village · GEOID 1765442. The survey estimates a population of 41,152 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Romeoville is 35.5 years, with a 90% margin of error of 1.5 years. There are 13,296 households (±479). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	35.5 ±1.5	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 41,152
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	9,051 ±870	22.0% ±2.1 pp	21.8%	22.0%
18–34	11,191 ±876	27.2% ±2.1 pp	22.7%	22.8%
35–64	16,123 ±969	39.2% ±2.4 pp	38.5%	38.0%
65 and older	4,787 ±524	11.6% ±1.3 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 41,152
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	19,778 ±683	48.1% ±1.7 pp	49.4%	49.5%
Female	21,374 ±687	51.9% ±1.7 pp	50.6%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 41,152
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	18,487 ±1,179	44.9% ±2.9 pp	61.0%	61.0%
Black or African American alone	5,892 ±1,037	14.3% ±2.5 pp	13.6%	12.2%
American Indian and Alaska Native alone	412 ±197	1.0% ±0.5 pp	0.6%	0.9%
Asian alone	2,681 ±559	6.5% ±1.4 pp	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	6 ±16 · low precision	0.0% ±0.0 pp · low precision	0.0%	0.2%
Some other race alone	5,932 ±1,294	14.4% ±3.1 pp	7.9%	7.1%
Two or more races	7,742 ±1,366	18.8% ±3.3 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 41,152
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	26,465 ±1,119	64.3% ±2.7 pp	81.2%	80.7%
Hispanic or Latino	14,687 ±1,105	35.7% ±2.7 pp	18.8%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 13,296
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	7,323 ±427	55.1% ±2.5 pp	45.3%	46.9%
Other family: male householder, no spouse present	632 ±201	4.8% ±1.5 pp	4.9%	5.1%
Other family: female householder, no spouse present	2,008 ±299	15.1% ±2.2 pp	11.9%	12.2%
Nonfamily: householder living alone	2,672 ±429	20.1% ±3.1 pp	31.2%	28.7%
Nonfamily: householder not living alone	661 ±223	5.0% ±1.7 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 13,296
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	5,165 ±314	38.8% ±1.9 pp	28.6%	29.5%
Households without people under 18	8,131 ±568	61.2% ±3.7 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 13,296
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	2,672 ±429	20.1% ±3.1 pp	31.2%	28.7%
Two-person households	3,425 ±420	25.8% ±3.0 pp	32.3%	33.8%
Three-person households	2,300 ±345	17.3% ±2.5 pp	14.7%	15.3%
Four-person households	2,592 ±395	19.5% ±2.9 pp	12.6%	12.6%
Five-person households	1,520 ±328	11.4% ±2.4 pp	5.8%	5.9%
Six-person households	373 ±139	2.8% ±1.0 pp	2.1%	2.2%
Seven or more people	414 ±153	3.1% ±1.1 pp	1.3%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 41,152
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	32,582 ±1,100	79.2% ±2.7 pp	85.3%	85.9%
Foreign born	8,570 ±1,097	20.8% ±2.7 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 38,598
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	23,094 ±1,372	59.8% ±3.5 pp	76.0%	77.7%
Spanish	10,322 ±1,131	26.7% ±2.9 pp	14.0%	13.6%
French, Haitian, or Cajun	78 ±85 · low precision	0.2% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	87 ±67 · low precision	0.2% ±0.2 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	1,497 ±518	3.9% ±1.3 pp	2.5%	0.7%
Other Indo-European	799 ±270	2.1% ±0.7 pp	2.6%	2.0%
Korean	11 ±18 · low precision	0.0% ±0.0 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	187 ±160 · low precision	0.5% ±0.4 pp · low precision	0.9%	1.1%
Vietnamese	32 ±53 · low precision	0.1% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	1,024 ±369	2.7% ±1.0 pp	0.7%	0.6%
Other Asian and Pacific Island	57 ±55 · low precision	0.1% ±0.1 pp · low precision	1.0%	1.1%
Arabic	517 ±419 · low precision	1.3% ±1.1 pp · low precision	0.6%	0.5%
Other and unspecified	893 ±421	2.3% ±1.1 pp	0.6%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 27,115
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	3,967 ±747	14.6% ±2.7 pp	9.5%	10.4%
High school graduate or equivalency	7,716 ±643	28.5% ±2.3 pp	25.1%	26.0%
Some college, no degree	5,493 ±561	20.3% ±2.0 pp	19.2%	19.1%
Associate’s degree	2,258 ±337	8.3% ±1.2 pp	8.3%	8.8%
Bachelor’s degree	5,057 ±540	18.7% ±1.9 pp	22.6%	21.6%
Graduate or professional degree	2,624 ±401	9.7% ±1.5 pp	15.3%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 40,773
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	37,457 ±763	91.9% ±1.8 pp	88.9%	87.7%
Moved within same county	1,482 ±529	3.6% ±1.3 pp	6.4%	6.3%
Moved from a different county in the same state	1,214 ±432	3.0% ±1.1 pp	2.4%	3.1%
Moved from a different state	386 ±158	0.9% ±0.4 pp	1.6%	2.3%
Moved from abroad	234 ±161 · low precision	0.6% ±0.4 pp · low precision	0.6%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

7.3% of Romeoville residents (±1.2 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 95.0% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Romeoville	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	7.3% ±1.2 pp	6.9%	8.4%	Not statistically different
Households with a broadband subscription Households	95.0% ±0.5 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	4.4% ±0.9 pp	4.8%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Romeoville . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Romeoville housing and cost context or return to the city profile.