Round Lake Heights, Illinois demographics

Round Lake Heights, IL demographics: median age 29.5; 18.4% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Round Lake Heights village, Illinois · Incorporated village · GEOID 1766053. The survey estimates a population of 2,592 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Round Lake Heights is 29.5 years, with a 90% margin of error of 5.5 years. There are 824 households (±160). 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	29.5 ±5.5	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 2,592
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	868 ±188	33.5% ±1.9 pp	21.8%	22.0%
18–34	598 ±135	23.1% ±1.9 pp	22.7%	22.8%
35–64	937 ±152	36.1% ±9.6 pp	38.5%	38.0%
65 and older	189 ±84	7.3% ±2.9 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 2,592
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	1,242 ±280	47.9% ±4.0 pp	49.4%	49.5%
Female	1,350 ±293	52.1% ±3.0 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: 2,592
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	1,118 ±305	43.1% ±7.6 pp	61.0%	61.0%
Black or African American alone	295 ±252 · low precision	11.4% ±9.4 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	73 ±59 · low precision	2.8% ±2.2 pp · low precision	0.6%	0.9%
Asian alone	130 ±85 · low precision	5.0% ±3.1 pp · low precision	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±13 · low precision	0.0% ±0.5 pp · low precision	0.0%	0.2%
Some other race alone	284 ±104	11.0% ±3.3 pp	7.9%	7.1%
Two or more races	692 ±347 · low precision	26.7% ±12.2 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 2,592
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	1,411 ±369	54.4% ±8.5 pp	81.2%	80.7%
Hispanic or Latino	1,181 ±435	45.6% ±13.8 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: 824
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	434 ±116	52.7% ±9.7 pp	45.3%	46.9%
Other family: male householder, no spouse present	65 ±38 · low precision	7.9% ±4.3 pp · low precision	4.9%	5.1%
Other family: female householder, no spouse present	126 ±54	15.3% ±5.8 pp	11.9%	12.2%
Nonfamily: householder living alone	175 ±90 · low precision	21.2% ±10.1 pp	31.2%	28.7%
Nonfamily: householder not living alone	24 ±23 · low precision	2.9% ±2.7 pp · low precision	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 824
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	375 ±108	45.5% ±9.7 pp	28.6%	29.5%
Households without people under 18	449 ±128	54.5% ±11.4 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 824
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	175 ±90 · low precision	21.2% ±10.1 pp	31.2%	28.7%
Two-person households	165 ±56	20.0% ±5.6 pp	32.3%	33.8%
Three-person households	162 ±57	19.7% ±5.7 pp	14.7%	15.3%
Four-person households	180 ±77	21.8% ±8.3 pp	12.6%	12.6%
Five-person households	97 ±61 · low precision	11.8% ±7.1 pp · low precision	5.8%	5.9%
Six-person households	25 ±38 · low precision	3.0% ±4.6 pp · low precision	2.1%	2.2%
Seven or more people	20 ±26 · low precision	2.4% ±3.2 pp · low precision	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: 2,592
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	2,012 ±431	77.6% ±3.6 pp	85.3%	85.9%
Foreign born	580 ±174	22.4% ±4.8 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 2,448
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	1,509 ±367	61.6% ±7.2 pp	76.0%	77.7%
Spanish	766 ±313	31.3% ±10.9 pp	14.0%	13.6%
French, Haitian, or Cajun	0 ±13 · low precision	0.0% ±0.5 pp · low precision	0.3%	0.7%
German or other West Germanic	0 ±13 · low precision	0.0% ±0.5 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	57 ±38 · low precision	2.3% ±1.5 pp · low precision	2.5%	0.7%
Other Indo-European	53 ±70 · low precision	2.2% ±2.8 pp · low precision	2.6%	2.0%
Korean	0 ±13 · low precision	0.0% ±0.5 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	3 ±5 · low precision	0.1% ±0.2 pp · low precision	0.9%	1.1%
Vietnamese	0 ±13 · low precision	0.0% ±0.5 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	39 ±34 · low precision	1.6% ±1.3 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	21 ±25 · low precision	0.9% ±1.0 pp · low precision	1.0%	1.1%
Arabic	0 ±13 · low precision	0.0% ±0.5 pp · low precision	0.6%	0.5%
Other and unspecified	0 ±13 · low precision	0.0% ±0.5 pp · low precision	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: 1,473
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	303 ±103	20.6% ±5.8 pp	9.5%	10.4%
High school graduate or equivalency	542 ±131	36.8% ±5.5 pp	25.1%	26.0%
Some college, no degree	297 ±83	20.2% ±4.1 pp	19.2%	19.1%
Associate’s degree	60 ±33 · low precision	4.1% ±2.1 pp · low precision	8.3%	8.8%
Bachelor’s degree	148 ±70	10.0% ±4.3 pp	22.6%	21.6%
Graduate or professional degree	123 ±61	8.4% ±3.8 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: 2,551
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	2,286 ±487	89.6% ±2.7 pp	88.9%	87.7%
Moved within same county	166 ±215 · low precision	6.5% ±8.3 pp · low precision	6.4%	6.3%
Moved from a different county in the same state	59 ±55 · low precision	2.3% ±2.1 pp · low precision	2.4%	3.1%
Moved from a different state	31 ±30 · low precision	1.2% ±1.1 pp · low precision	1.6%	2.3%
Moved from abroad	9 ±12 · low precision	0.4% ±0.5 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

12.9% of Round Lake Heights residents (±5.8 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 91.3% 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	Round Lake Heights	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	12.9% ±5.8 pp	6.9%	8.4%	Higher
Households with a broadband subscription Households	91.3% ±24.7 pp	90.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	3.4% ±2.1 pp · low precision	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 Round Lake Heights . 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 Round Lake Heights housing and cost context or return to the city profile.