Somerville, Massachusetts demographics

Somerville, MA demographics: median age 31.9; 69.4% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Somerville city, Massachusetts · Incorporated city · GEOID 2562535. The survey estimates a population of 81,036 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Somerville is 31.9 years, with a 90% margin of error of 0.6 years. There are 35,715 households (±869). 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	31.9 ±0.6	40.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 81,036
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Under 18	7,961 ±669	9.8% ±0.8 pp	19.4%	22.0%
18–34	39,038 ±1,564	48.2% ±1.9 pp	23.9%	22.8%
35–64	25,929 ±1,253	32.0% ±1.5 pp	38.9%	38.0%
65 and older	8,108 ±643	10.0% ±0.8 pp	17.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 81,036
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Male	39,660 ±886	48.9% ±1.1 pp	48.9%	49.5%
Female	41,376 ±881	51.1% ±1.1 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: 81,036
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
White alone	54,937 ±1,556	67.8% ±1.9 pp	68.6%	61.0%
Black or African American alone	3,634 ±636	4.5% ±0.8 pp	6.8%	12.2%
American Indian and Alaska Native alone	125 ±146 · low precision	0.2% ±0.2 pp · low precision	0.2%	0.9%
Asian alone	9,366 ±1,052	11.6% ±1.3 pp	7.3%	6.0%
Native Hawaiian and Other Pacific Islander alone	41 ±30 · low precision	0.1% ±0.0 pp · low precision	0.0%	0.2%
Some other race alone	4,176 ±972	5.2% ±1.2 pp	5.8%	7.1%
Two or more races	8,757 ±1,016	10.8% ±1.3 pp	11.1%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 81,036
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Not Hispanic or Latino	71,791 ±1,335	88.6% ±1.6 pp	86.7%	80.7%
Hispanic or Latino	9,245 ±1,336	11.4% ±1.6 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: 35,715
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Married-couple family	10,607 ±578	29.7% ±1.4 pp	45.9%	46.9%
Other family: male householder, no spouse present	918 ±223	2.6% ±0.6 pp	4.7%	5.1%
Other family: female householder, no spouse present	1,802 ±304	5.0% ±0.8 pp	11.9%	12.2%
Nonfamily: householder living alone	11,650 ±1,034	32.6% ±2.8 pp	28.8%	28.7%
Nonfamily: householder not living alone	10,738 ±686	30.1% ±1.8 pp	8.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 35,715
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Households with people under 18	5,049 ±400	14.1% ±1.1 pp	27.9%	29.5%
Households without people under 18	30,666 ±1,036	85.9% ±2.0 pp	72.1%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 35,715
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
One-person nonfamily households	11,650 ±1,034	32.6% ±2.8 pp	28.8%	28.7%
Two-person households	13,065 ±815	36.6% ±2.1 pp	33.3%	33.8%
Three-person households	6,031 ±636	16.9% ±1.7 pp	16.5%	15.3%
Four-person households	3,403 ±458	9.5% ±1.3 pp	13.5%	12.6%
Five-person households	953 ±210	2.7% ±0.6 pp	5.2%	5.9%
Six-person households	412 ±161	1.2% ±0.4 pp	1.8%	2.2%
Seven or more people	201 ±96	0.6% ±0.3 pp	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: 81,036
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Native	61,596 ±1,193	76.0% ±1.5 pp	82.0%	85.9%
Foreign born	19,440 ±1,197	24.0% ±1.5 pp	18.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 77,932
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
English only	55,636 ±1,379	71.4% ±1.7 pp	74.9%	77.7%
Spanish	6,947 ±1,137	8.9% ±1.5 pp	9.7%	13.6%
French, Haitian, or Cajun	1,504 ±350	1.9% ±0.4 pp	1.9%	0.7%
German or other West Germanic	690 ±240	0.9% ±0.3 pp	0.3%	0.5%
Russian, Polish, or other Slavic	678 ±216	0.9% ±0.3 pp	1.0%	0.7%
Other Indo-European	7,329 ±964	9.4% ±1.2 pp	6.1%	2.0%
Korean	424 ±134	0.5% ±0.2 pp	0.3%	0.3%
Chinese, including Mandarin and Cantonese	1,999 ±402	2.6% ±0.5 pp	2.2%	1.1%
Vietnamese	205 ±97	0.3% ±0.1 pp	0.7%	0.5%
Tagalog, including Filipino	174 ±110 · low precision	0.2% ±0.1 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	1,021 ±265	1.3% ±0.3 pp	1.3%	1.1%
Arabic	705 ±337	0.9% ±0.4 pp	0.6%	0.5%
Other and unspecified	620 ±257	0.8% ±0.3 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: 61,608
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Less than high school graduate	4,358 ±573	7.1% ±0.9 pp	8.6%	10.4%
High school graduate or equivalency	7,561 ±821	12.3% ±1.3 pp	22.6%	26.0%
Some college, no degree	4,639 ±599	7.5% ±1.0 pp	14.1%	19.1%
Associate’s degree	2,273 ±357	3.7% ±0.6 pp	7.5%	8.8%
Bachelor’s degree	22,193 ±1,098	36.0% ±1.7 pp	25.5%	21.6%
Graduate or professional degree	20,584 ±972	33.4% ±1.5 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: 80,195
Category	Count ± MOE	Share ± MOE (pp)	Massachusetts	U.S.
Same house	60,605 ±1,317	75.6% ±1.6 pp	88.3%	87.7%
Moved within same county	8,661 ±788	10.8% ±1.0 pp	5.6%	6.3%
Moved from a different county in the same state	5,402 ±761	6.7% ±0.9 pp	3.0%	3.1%
Moved from a different state	4,351 ±696	5.4% ±0.9 pp	2.2%	2.3%
Moved from abroad	1,176 ±327	1.5% ±0.4 pp	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

1.9% of Somerville residents (±0.4 percentage points) had no health insurance coverage when surveyed, compared with 2.6% in Massachusetts and 8.4% nationally. 94.7% 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	Somerville	Massachusetts	U.S.	Compared with Massachusetts
People without health insurance Civilian noninstitutionalized population	1.9% ±0.4 pp	2.6%	8.4%	Lower
Households with a broadband subscription Households	94.7% ±0.9 pp	92.8%	91.0%	Higher
Veterans Civilian population age 18 and older	1.4% ±0.3 pp	4.3%	6.2%	Lower

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 Somerville . 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 Somerville housing and cost context or return to the city profile.