Lemont, Illinois demographics

Lemont, IL demographics: median age 43.7; 46.9% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Lemont village, Illinois · Incorporated village · GEOID 1742795. The survey estimates a population of 17,820 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Lemont is 43.7 years, with a 90% margin of error of 0.8 years. There are 6,412 households (±321). 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	43.7 ±0.8	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 17,820
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	4,460 ±584	25.0% ±3.3 pp	21.8%	22.0%
18–34	2,187 ±374	12.3% ±2.1 pp	22.7%	22.8%
35–64	7,458 ±731	41.9% ±4.1 pp	38.5%	38.0%
65 and older	3,715 ±467	20.8% ±2.6 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 17,820
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	8,958 ±434	50.3% ±2.4 pp	49.4%	49.5%
Female	8,862 ±435	49.7% ±2.4 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: 17,820
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	15,381 ±831	86.3% ±4.7 pp	61.0%	61.0%
Black or African American alone	296 ±268 · low precision	1.7% ±1.5 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	0 ±20 · low precision	0.0% ±0.1 pp · low precision	0.6%	0.9%
Asian alone	502 ±379 · low precision	2.8% ±2.1 pp · low precision	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±20 · low precision	0.0% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	204 ±173 · low precision	1.1% ±1.0 pp · low precision	7.9%	7.1%
Two or more races	1,437 ±605	8.1% ±3.4 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 17,820
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	16,241 ±710	91.1% ±4.0 pp	81.2%	80.7%
Hispanic or Latino	1,579 ±706	8.9% ±4.0 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: 6,412
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	4,093 ±284	63.8% ±3.1 pp	45.3%	46.9%
Other family: male householder, no spouse present	100 ±64 · low precision	1.6% ±1.0 pp · low precision	4.9%	5.1%
Other family: female householder, no spouse present	630 ±182	9.8% ±2.8 pp	11.9%	12.2%
Nonfamily: householder living alone	1,457 ±311	22.7% ±4.7 pp	31.2%	28.7%
Nonfamily: householder not living alone	132 ±98 · low precision	2.1% ±1.5 pp · low precision	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 6,412
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	2,351 ±230	36.7% ±3.1 pp	28.6%	29.5%
Households without people under 18	4,061 ±405	63.3% ±5.5 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 6,412
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	1,457 ±311	22.7% ±4.7 pp	31.2%	28.7%
Two-person households	2,151 ±271	33.5% ±3.9 pp	32.3%	33.8%
Three-person households	876 ±226	13.7% ±3.5 pp	14.7%	15.3%
Four-person households	1,276 ±284	19.9% ±4.3 pp	12.6%	12.6%
Five-person households	378 ±157	5.9% ±2.4 pp	5.8%	5.9%
Six-person households	204 ±136 · low precision	3.2% ±2.1 pp · low precision	2.1%	2.2%
Seven or more people	70 ±60 · low precision	1.1% ±0.9 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: 17,820
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	14,656 ±774	82.2% ±4.3 pp	85.3%	85.9%
Foreign born	3,164 ±774	17.8% ±4.3 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 16,852
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	12,000 ±1,180	71.2% ±6.9 pp	76.0%	77.7%
Spanish	421 ±229 · low precision	2.5% ±1.4 pp · low precision	14.0%	13.6%
French, Haitian, or Cajun	47 ±76 · low precision	0.3% ±0.5 pp · low precision	0.3%	0.7%
German or other West Germanic	46 ±61 · low precision	0.3% ±0.4 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	2,436 ±991	14.5% ±5.9 pp	2.5%	0.7%
Other Indo-European	1,554 ±481	9.2% ±2.9 pp	2.6%	2.0%
Korean	0 ±20 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	28 ±46 · low precision	0.2% ±0.3 pp · low precision	0.9%	1.1%
Vietnamese	0 ±20 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	46 ±61 · low precision	0.3% ±0.4 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	22 ±34 · low precision	0.1% ±0.2 pp · low precision	1.0%	1.1%
Arabic	247 ±238 · low precision	1.5% ±1.4 pp · low precision	0.6%	0.5%
Other and unspecified	5 ±18 · low precision	0.0% ±0.1 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: 12,261
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	524 ±209	4.3% ±1.7 pp	9.5%	10.4%
High school graduate or equivalency	2,486 ±436	20.3% ±3.5 pp	25.1%	26.0%
Some college, no degree	2,444 ±511	19.9% ±4.1 pp	19.2%	19.1%
Associate’s degree	1,060 ±228	8.6% ±1.8 pp	8.3%	8.8%
Bachelor’s degree	3,342 ±458	27.3% ±3.6 pp	22.6%	21.6%
Graduate or professional degree	2,405 ±411	19.6% ±3.3 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: 17,638
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	16,675 ±428	94.5% ±2.4 pp	88.9%	87.7%
Moved within same county	530 ±314 · low precision	3.0% ±1.8 pp · low precision	6.4%	6.3%
Moved from a different county in the same state	261 ±276 · low precision	1.5% ±1.6 pp · low precision	2.4%	3.1%
Moved from a different state	60 ±43 · low precision	0.3% ±0.2 pp · low precision	1.6%	2.3%
Moved from abroad	112 ±144 · low precision	0.6% ±0.8 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

1.8% of Lemont residents (±0.8 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 92.4% 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	Lemont	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	1.8% ±0.8 pp	6.9%	8.4%	Lower
Households with a broadband subscription Households	92.4% ±2.2 pp	90.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	4.9% ±1.3 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 Lemont . 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 Lemont housing and cost context or return to the city profile.