Leominster, Massachusetts demographics

Leominster, MA demographics: median age 43.3; 33.5% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Leominster city, Massachusetts · Incorporated city · GEOID 2535075. The survey estimates a population of 43,909 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Leominster is 43.3 years, with a 90% margin of error of 2.2 years. There are 18,483 households (±672). 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	43.3 ±2.2	40.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 43,909
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Under 18	8,343 ±776	19.0% ±1.8 pp	19.4%	22.0%
18–34	8,985 ±933	20.5% ±2.1 pp	23.9%	22.8%
35–64	18,102 ±1,138	41.2% ±2.6 pp	38.9%	38.0%
65 and older	8,479 ±823	19.3% ±1.9 pp	17.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 43,909
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Male	22,081 ±780	50.3% ±1.8 pp	48.9%	49.5%
Female	21,828 ±781	49.7% ±1.8 pp	51.1%	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: 43,909
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
White alone	31,050 ±1,372	70.7% ±3.1 pp	68.6%	61.0%
Black or African American alone	2,272 ±606	5.2% ±1.4 pp	6.8%	12.2%
American Indian and Alaska Native alone	11 ±35 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.9%
Asian alone	1,395 ±468	3.2% ±1.1 pp	7.3%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±29 · low precision	0.0% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	3,078 ±893	7.0% ±2.0 pp	5.8%	7.1%
Two or more races	6,103 ±1,229	13.9% ±2.8 pp	11.1%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 43,909
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Not Hispanic or Latino	36,882 ±1,000	84.0% ±2.3 pp	86.7%	80.7%
Hispanic or Latino	7,027 ±999	16.0% ±2.3 pp	13.3%	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: 18,483
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Married-couple family	7,948 ±544	43.0% ±2.5 pp	45.9%	46.9%
Other family: male householder, no spouse present	1,210 ±291	6.5% ±1.6 pp	4.7%	5.1%
Other family: female householder, no spouse present	2,127 ±406	11.5% ±2.2 pp	11.9%	12.2%
Nonfamily: householder living alone	5,874 ±834	31.8% ±4.4 pp	28.8%	28.7%
Nonfamily: householder not living alone	1,324 ±334	7.2% ±1.8 pp	8.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 18,483
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Households with people under 18	4,719 ±423	25.5% ±2.1 pp	27.9%	29.5%
Households without people under 18	13,764 ±917	74.5% ±4.2 pp	72.1%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 18,483
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
One-person nonfamily households	5,874 ±834	31.8% ±4.4 pp	28.8%	28.7%
Two-person households	6,588 ±663	35.6% ±3.3 pp	33.3%	33.8%
Three-person households	2,614 ±406	14.1% ±2.1 pp	16.5%	15.3%
Four-person households	2,046 ±287	11.1% ±1.5 pp	13.5%	12.6%
Five-person households	891 ±243	4.8% ±1.3 pp	5.2%	5.9%
Six-person households	340 ±162	1.8% ±0.9 pp	1.8%	2.2%
Seven or more people	130 ±72 · low precision	0.7% ±0.4 pp · low precision	0.9%	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: 43,909
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Native	37,015 ±863	84.3% ±2.0 pp	82.0%	85.9%
Foreign born	6,894 ±865	15.7% ±2.0 pp	18.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 41,702
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
English only	31,878 ±1,301	76.4% ±3.0 pp	74.9%	77.7%
Spanish	4,736 ±960	11.4% ±2.3 pp	9.7%	13.6%
French, Haitian, or Cajun	514 ±241	1.2% ±0.6 pp	1.9%	0.7%
German or other West Germanic	150 ±96 · low precision	0.4% ±0.2 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	256 ±348 · low precision	0.6% ±0.8 pp · low precision	1.0%	0.7%
Other Indo-European	2,401 ±877	5.8% ±2.1 pp	6.1%	2.0%
Korean	203 ±246 · low precision	0.5% ±0.6 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	77 ±82 · low precision	0.2% ±0.2 pp · low precision	2.2%	1.1%
Vietnamese	128 ±110 · low precision	0.3% ±0.3 pp · low precision	0.7%	0.5%
Tagalog, including Filipino	18 ±30 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	327 ±216 · low precision	0.8% ±0.5 pp · low precision	1.3%	1.1%
Arabic	109 ±76 · low precision	0.3% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	905 ±379	2.2% ±0.9 pp	1.0%	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: 32,256
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Less than high school graduate	3,133 ±534	9.7% ±1.6 pp	8.6%	10.4%
High school graduate or equivalency	9,585 ±807	29.7% ±2.4 pp	22.6%	26.0%
Some college, no degree	5,313 ±615	16.5% ±1.9 pp	14.1%	19.1%
Associate’s degree	3,419 ±552	10.6% ±1.7 pp	7.5%	8.8%
Bachelor’s degree	6,737 ±705	20.9% ±2.1 pp	25.5%	21.6%
Graduate or professional degree	4,069 ±633	12.6% ±1.9 pp	21.8%	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: 43,472
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Same house	40,013 ±710	92.0% ±1.6 pp	88.3%	87.7%
Moved within same county	2,049 ±605	4.7% ±1.4 pp	5.6%	6.3%
Moved from a different county in the same state	1,163 ±475	2.7% ±1.1 pp	3.0%	3.1%
Moved from a different state	162 ±120 · low precision	0.4% ±0.3 pp · low precision	2.2%	2.3%
Moved from abroad	85 ±59 · low precision	0.2% ±0.1 pp · low precision	0.9%	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 Leominster residents (±0.7 percentage points) had no health insurance coverage when surveyed, compared with 2.6% in Massachusetts and 8.4% nationally. 93.7% 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	Leominster	Massachusetts	U.S.	Compared with Massachusetts
People without health insurance Civilian noninstitutionalized population	1.8% ±0.7 pp	2.6%	8.4%	Lower
Households with a broadband subscription Households	93.7% ±4.6 pp	92.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	4.8% ±0.8 pp	4.3%	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 Leominster . 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 Leominster housing and cost context or return to the city profile.