South Portland, Maine demographics

South Portland, ME demographics: median age 40.9; 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 · South Portland city, Maine · Incorporated city · GEOID 2371990. The survey estimates a population of 26,930 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in South Portland is 40.9 years, with a 90% margin of error of 2.1 years. There are 12,152 households (±464). 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	40.9 ±2.1	44.8 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 26,930
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Under 18	3,951 ±448	14.7% ±1.7 pp	18.1%	22.0%
18–34	7,261 ±727	27.0% ±2.7 pp	20.0%	22.8%
35–64	10,138 ±692	37.6% ±2.6 pp	39.6%	38.0%
65 and older	5,580 ±604	20.7% ±2.2 pp	22.4%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 26,930
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Male	12,453 ±530	46.2% ±2.0 pp	49.3%	49.5%
Female	14,477 ±533	53.8% ±2.0 pp	50.7%	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: 26,930
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
White alone	21,529 ±672	79.9% ±2.5 pp	90.5%	61.0%
Black or African American alone	1,939 ±495	7.2% ±1.8 pp	1.8%	12.2%
American Indian and Alaska Native alone	70 ±50 · low precision	0.3% ±0.2 pp · low precision	0.4%	0.9%
Asian alone	911 ±333	3.4% ±1.2 pp	1.2%	6.0%
Native Hawaiian and Other Pacific Islander alone	8 ±13 · low precision	0.0% ±0.0 pp · low precision	0.0%	0.2%
Some other race alone	427 ±288 · low precision	1.6% ±1.1 pp · low precision	0.8%	7.1%
Two or more races	2,046 ±345	7.6% ±1.3 pp	5.3%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 26,930
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Not Hispanic or Latino	25,848 ±319	96.0% ±1.2 pp	97.8%	80.7%
Hispanic or Latino	1,082 ±318	4.0% ±1.2 pp	2.2%	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: 12,152
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Married-couple family	4,849 ±398	39.9% ±2.9 pp	48.0%	46.9%
Other family: male householder, no spouse present	392 ±135	3.2% ±1.1 pp	4.1%	5.1%
Other family: female householder, no spouse present	1,159 ±240	9.5% ±1.9 pp	8.6%	12.2%
Nonfamily: householder living alone	4,315 ±513	35.5% ±4.0 pp	30.7%	28.7%
Nonfamily: householder not living alone	1,437 ±287	11.8% ±2.3 pp	8.5%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 12,152
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Households with people under 18	2,517 ±240	20.7% ±1.8 pp	23.7%	29.5%
Households without people under 18	9,635 ±533	79.3% ±3.2 pp	76.3%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 12,152
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
One-person nonfamily households	4,315 ±513	35.5% ±4.0 pp	30.7%	28.7%
Two-person households	4,406 ±459	36.3% ±3.5 pp	39.1%	33.8%
Three-person households	1,667 ±272	13.7% ±2.2 pp	13.9%	15.3%
Four-person households	1,392 ±269	11.5% ±2.2 pp	10.6%	12.6%
Five-person households	216 ±91	1.8% ±0.7 pp	3.9%	5.9%
Six-person households	105 ±83 · low precision	0.9% ±0.7 pp · low precision	1.2%	2.2%
Seven or more people	51 ±48 · low precision	0.4% ±0.4 pp · low precision	0.6%	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: 26,930
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Native	24,111 ±522	89.5% ±1.9 pp	95.9%	85.9%
Foreign born	2,819 ±519	10.5% ±1.9 pp	4.1%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 25,618
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
English only	22,400 ±625	87.4% ±2.3 pp	94.0%	77.7%
Spanish	538 ±287 · low precision	2.1% ±1.1 pp · low precision	1.0%	13.6%
French, Haitian, or Cajun	385 ±163	1.5% ±0.6 pp	2.3%	0.7%
German or other West Germanic	28 ±32 · low precision	0.1% ±0.1 pp · low precision	0.4%	0.5%
Russian, Polish, or other Slavic	68 ±56 · low precision	0.3% ±0.2 pp · low precision	0.3%	0.7%
Other Indo-European	605 ±359 · low precision	2.4% ±1.4 pp · low precision	0.6%	2.0%
Korean	32 ±37 · low precision	0.1% ±0.1 pp · low precision	0.0%	0.3%
Chinese, including Mandarin and Cantonese	300 ±225 · low precision	1.2% ±0.9 pp · low precision	0.2%	1.1%
Vietnamese	0 ±20 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.5%
Tagalog, including Filipino	24 ±33 · low precision	0.1% ±0.1 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	225 ±200 · low precision	0.9% ±0.8 pp · low precision	0.2%	1.1%
Arabic	23 ±47 · low precision	0.1% ±0.2 pp · low precision	0.1%	0.5%
Other and unspecified	990 ±413	3.9% ±1.6 pp	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: 19,798
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Less than high school graduate	814 ±263	4.1% ±1.3 pp	5.2%	10.4%
High school graduate or equivalency	4,186 ±553	21.1% ±2.7 pp	30.1%	26.0%
Some college, no degree	2,874 ±398	14.5% ±2.0 pp	18.1%	19.1%
Associate’s degree	1,679 ±313	8.5% ±1.6 pp	10.4%	8.8%
Bachelor’s degree	6,479 ±679	32.7% ±3.3 pp	22.5%	21.6%
Graduate or professional degree	3,766 ±452	19.0% ±2.2 pp	13.7%	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: 26,789
Category	Count ± MOE	Share ± MOE (pp)	Maine	U.S.
Same house	23,530 ±474	87.8% ±1.7 pp	89.4%	87.7%
Moved within same county	1,582 ±421	5.9% ±1.6 pp	5.1%	6.3%
Moved from a different county in the same state	473 ±161	1.8% ±0.6 pp	2.4%	3.1%
Moved from a different state	885 ±254	3.3% ±0.9 pp	2.7%	2.3%
Moved from abroad	319 ±183 · low precision	1.2% ±0.7 pp · low precision	0.3%	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

6.3% of South Portland residents (±1.8 percentage points) had no health insurance coverage when surveyed, compared with 6.2% in Maine and 8.4% nationally. 91.7% 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	South Portland	Maine	U.S.	Compared with Maine
People without health insurance Civilian noninstitutionalized population	6.3% ±1.8 pp	6.2%	8.4%	Not statistically different
Households with a broadband subscription Households	91.7% ±1.7 pp	90.3%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	5.3% ±1.2 pp	8.4%	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 South Portland . 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 South Portland housing and cost context or return to the city profile.