Stamford, Connecticut demographics

Stamford, CT demographics: median age 38.4; 51.7% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Stamford city, Connecticut · Incorporated city · GEOID 0973000. The survey estimates a population of 137,144 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Stamford is 38.4 years, with a 90% margin of error of 0.7 years. There are 55,291 households (±1,100). 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	38.4 ±0.7	41.1 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 137,144
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Under 18	25,231 ±1,429	18.4% ±1.0 pp	20.2%	22.0%
18–34	36,714 ±1,625	26.8% ±1.2 pp	21.9%	22.8%
35–64	53,007 ±1,839	38.7% ±1.3 pp	39.4%	38.0%
65 and older	22,192 ±1,219	16.2% ±0.9 pp	18.5%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 137,144
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Male	66,263 ±1,307	48.3% ±1.0 pp	49.1%	49.5%
Female	70,881 ±1,308	51.7% ±1.0 pp	50.9%	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: 137,144
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
White alone	63,975 ±2,107	46.6% ±1.5 pp	65.1%	61.0%
Black or African American alone	24,780 ±1,767	18.1% ±1.3 pp	10.6%	12.2%
American Indian and Alaska Native alone	901 ±469 · low precision	0.7% ±0.3 pp · low precision	0.3%	0.9%
Asian alone	10,147 ±903	7.4% ±0.7 pp	4.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	139 ±172 · low precision	0.1% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	15,956 ±1,768	11.6% ±1.3 pp	7.7%	7.1%
Two or more races	21,246 ±2,114	15.5% ±1.5 pp	11.4%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 137,144
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Not Hispanic or Latino	98,334 ±1,648	71.7% ±1.2 pp	81.7%	80.7%
Hispanic or Latino	38,810 ±1,642	28.3% ±1.2 pp	18.3%	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: 55,291
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Married-couple family	23,332 ±998	42.2% ±1.6 pp	46.6%	46.9%
Other family: male householder, no spouse present	2,503 ±507	4.5% ±0.9 pp	5.0%	5.1%
Other family: female householder, no spouse present	6,776 ±795	12.3% ±1.4 pp	12.7%	12.2%
Nonfamily: householder living alone	17,643 ±998	31.9% ±1.7 pp	29.1%	28.7%
Nonfamily: householder not living alone	5,037 ±600	9.1% ±1.1 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 55,291
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Households with people under 18	14,218 ±692	25.7% ±1.1 pp	28.6%	29.5%
Households without people under 18	41,073 ±1,356	74.3% ±2.0 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 55,291
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
One-person nonfamily households	17,643 ±998	31.9% ±1.7 pp	29.1%	28.7%
Two-person households	17,433 ±1,147	31.5% ±2.0 pp	33.4%	33.8%
Three-person households	9,309 ±806	16.8% ±1.4 pp	16.4%	15.3%
Four-person households	6,034 ±628	10.9% ±1.1 pp	13.3%	12.6%
Five-person households	3,237 ±463	5.9% ±0.8 pp	5.4%	5.9%
Six-person households	827 ±210	1.5% ±0.4 pp	1.7%	2.2%
Seven or more people	808 ±218	1.5% ±0.4 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: 137,144
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Native	94,202 ±1,997	68.7% ±1.5 pp	84.3%	85.9%
Foreign born	42,942 ±1,993	31.3% ±1.5 pp	15.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 129,359
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
English only	76,800 ±2,353	59.4% ±1.8 pp	76.6%	77.7%
Spanish	29,161 ±1,667	22.5% ±1.3 pp	12.8%	13.6%
French, Haitian, or Cajun	5,329 ±1,040	4.1% ±0.8 pp	1.2%	0.7%
German or other West Germanic	386 ±182	0.3% ±0.1 pp	0.3%	0.5%
Russian, Polish, or other Slavic	4,005 ±707	3.1% ±0.5 pp	1.5%	0.7%
Other Indo-European	7,010 ±856	5.4% ±0.7 pp	4.0%	2.0%
Korean	130 ±79 · low precision	0.1% ±0.1 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	2,270 ±416	1.8% ±0.3 pp	0.9%	1.1%
Vietnamese	156 ±110 · low precision	0.1% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	595 ±235	0.5% ±0.2 pp	0.3%	0.6%
Other Asian and Pacific Island	1,730 ±460	1.3% ±0.4 pp	0.9%	1.1%
Arabic	574 ±294 · low precision	0.4% ±0.2 pp · low precision	0.4%	0.5%
Other and unspecified	1,213 ±490	0.9% ±0.4 pp	0.7%	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: 98,962
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Less than high school graduate	11,046 ±1,226	11.2% ±1.2 pp	8.5%	10.4%
High school graduate or equivalency	17,745 ±1,203	17.9% ±1.2 pp	25.3%	26.0%
Some college, no degree	13,491 ±1,165	13.6% ±1.2 pp	16.1%	19.1%
Associate’s degree	5,498 ±663	5.6% ±0.7 pp	7.6%	8.8%
Bachelor’s degree	29,209 ±1,306	29.5% ±1.2 pp	23.3%	21.6%
Graduate or professional degree	21,973 ±1,089	22.2% ±1.1 pp	19.2%	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: 135,633
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Same house	115,013 ±2,031	84.8% ±1.5 pp	89.2%	87.7%
Moved within same county	10,988 ±1,800	8.1% ±1.3 pp	5.6%	6.3%
Moved from a different county in the same state	2,058 ±727	1.5% ±0.5 pp	2.0%	3.1%
Moved from a different state	6,077 ±959	4.5% ±0.7 pp	2.6%	2.3%
Moved from abroad	1,497 ±505	1.1% ±0.4 pp	0.7%	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

9.3% of Stamford residents (±0.9 percentage points) had no health insurance coverage when surveyed, compared with 5.4% in Connecticut and 8.4% nationally. 94.2% 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	Stamford	Connecticut	U.S.	Compared with Connecticut
People without health insurance Civilian noninstitutionalized population	9.3% ±0.9 pp	5.4%	8.4%	Higher
Households with a broadband subscription Households	94.2% ±0.6 pp	92.2%	91.0%	Higher
Veterans Civilian population age 18 and older	2.1% ±0.3 pp	4.7%	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 Stamford . 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 Stamford housing and cost context or return to the city profile.