Montgomery, Illinois demographics

Montgomery, IL demographics: median age 35.3; 28.7% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Montgomery village, Illinois · Incorporated village · GEOID 1750218. The survey estimates a population of 21,515 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Montgomery is 35.3 years, with a 90% margin of error of 1.4 years. There are 7,144 households (±445). 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	35.3 ±1.4	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 21,515
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	6,122 ±797	28.5% ±3.6 pp	21.8%	22.0%
18–34	4,488 ±724	20.9% ±3.3 pp	22.7%	22.8%
35–64	8,578 ±932	39.9% ±4.2 pp	38.5%	38.0%
65 and older	2,327 ±418	10.8% ±1.9 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 21,515
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	11,374 ±714	52.9% ±3.1 pp	49.4%	49.5%
Female	10,141 ±678	47.1% ±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: 21,515
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	12,457 ±1,324	57.9% ±6.0 pp	61.0%	61.0%
Black or African American alone	1,722 ±536	8.0% ±2.5 pp	13.6%	12.2%
American Indian and Alaska Native alone	130 ±140 · low precision	0.6% ±0.7 pp · low precision	0.6%	0.9%
Asian alone	489 ±263 · low precision	2.3% ±1.2 pp · low precision	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	2,340 ±1,291 · low precision	10.9% ±6.0 pp · low precision	7.9%	7.1%
Two or more races	4,377 ±835	20.3% ±3.9 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 21,515
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	14,619 ±1,342	67.9% ±6.0 pp	81.2%	80.7%
Hispanic or Latino	6,896 ±1,356	32.1% ±6.3 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: 7,144
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	4,151 ±511	58.1% ±6.2 pp	45.3%	46.9%
Other family: male householder, no spouse present	491 ±229	6.9% ±3.2 pp	4.9%	5.1%
Other family: female householder, no spouse present	742 ±323	10.4% ±4.5 pp	11.9%	12.2%
Nonfamily: householder living alone	1,341 ±410	18.8% ±5.6 pp	31.2%	28.7%
Nonfamily: householder not living alone	419 ±205	5.9% ±2.8 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 7,144
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	3,290 ±381	46.1% ±4.5 pp	28.6%	29.5%
Households without people under 18	3,854 ±585	53.9% ±7.5 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 7,144
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	1,341 ±410	18.8% ±5.6 pp	31.2%	28.7%
Two-person households	1,633 ±357	22.9% ±4.8 pp	32.3%	33.8%
Three-person households	1,237 ±335	17.3% ±4.6 pp	14.7%	15.3%
Four-person households	1,377 ±308	19.3% ±4.1 pp	12.6%	12.6%
Five-person households	1,115 ±453	15.6% ±6.3 pp	5.8%	5.9%
Six-person households	369 ±187 · low precision	5.2% ±2.6 pp · low precision	2.1%	2.2%
Seven or more people	72 ±105 · low precision	1.0% ±1.5 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: 21,515
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	18,878 ±728	87.7% ±2.7 pp	85.3%	85.9%
Foreign born	2,637 ±555	12.3% ±2.6 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 20,085
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	14,593 ±1,127	72.7% ±5.2 pp	76.0%	77.7%
Spanish	4,639 ±1,097	23.1% ±5.4 pp	14.0%	13.6%
French, Haitian, or Cajun	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.7%
German or other West Germanic	46 ±63 · low precision	0.2% ±0.3 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	234 ±200 · low precision	1.2% ±1.0 pp · low precision	2.5%	0.7%
Other Indo-European	135 ±124 · low precision	0.7% ±0.6 pp · low precision	2.6%	2.0%
Korean	62 ±82 · low precision	0.3% ±0.4 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.9%	1.1%
Vietnamese	13 ±26 · low precision	0.1% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	29 ±41 · low precision	0.1% ±0.2 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	52 ±71 · low precision	0.3% ±0.4 pp · low precision	1.0%	1.1%
Arabic	37 ±59 · low precision	0.2% ±0.3 pp · low precision	0.6%	0.5%
Other and unspecified	245 ±167 · low precision	1.2% ±0.8 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: 13,290
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	1,186 ±350	8.9% ±2.6 pp	9.5%	10.4%
High school graduate or equivalency	3,790 ±775	28.5% ±5.7 pp	25.1%	26.0%
Some college, no degree	2,717 ±532	20.4% ±3.9 pp	19.2%	19.1%
Associate’s degree	1,787 ±669	13.4% ±5.0 pp	8.3%	8.8%
Bachelor’s degree	3,064 ±512	23.1% ±3.7 pp	22.6%	21.6%
Graduate or professional degree	746 ±229	5.6% ±1.7 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: 21,336
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	20,480 ±587	96.0% ±1.7 pp	88.9%	87.7%
Moved within same county	350 ±269 · low precision	1.6% ±1.3 pp · low precision	6.4%	6.3%
Moved from a different county in the same state	436 ±200	2.0% ±0.9 pp	2.4%	3.1%
Moved from a different state	33 ±46 · low precision	0.2% ±0.2 pp · low precision	1.6%	2.3%
Moved from abroad	37 ±54 · low precision	0.2% ±0.3 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

2.6% of Montgomery residents (±1.4 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 96.6% 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	Montgomery	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	2.6% ±1.4 pp · low precision	6.9%	8.4%	Lower
Households with a broadband subscription Households	96.6% ±2.8 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	4.0% ±1.5 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 Montgomery . 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 Montgomery housing and cost context or return to the city profile.