South San Francisco, California demographics

South San Francisco, CA demographics: median age 43.2; 40.8% 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 San Francisco city, California · Incorporated city · GEOID 0673262. The survey estimates a population of 64,305 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in South San Francisco is 43.2 years, with a 90% margin of error of 1.4 years. There are 21,838 households (±653). 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	43.2 ±1.4	37.9 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 64,305
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Under 18	11,075 ±801	17.2% ±1.2 pp	22.0%	22.0%
18–34	12,856 ±902	20.0% ±1.4 pp	23.9%	22.8%
35–64	28,054 ±1,294	43.6% ±2.0 pp	38.5%	38.0%
65 and older	12,320 ±772	19.2% ±1.2 pp	15.7%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 64,305
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Male	32,237 ±751	50.1% ±1.2 pp	49.9%	49.5%
Female	32,068 ±752	49.9% ±1.2 pp	50.1%	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: 64,305
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
White alone	15,244 ±1,243	23.7% ±1.9 pp	39.7%	61.0%
Black or African American alone	999 ±357	1.6% ±0.6 pp	5.4%	12.2%
American Indian and Alaska Native alone	623 ±263	1.0% ±0.4 pp	1.3%	0.9%
Asian alone	27,174 ±1,363	42.3% ±2.1 pp	15.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	557 ±361 · low precision	0.9% ±0.6 pp · low precision	0.4%	0.2%
Some other race alone	9,989 ±1,504	15.5% ±2.3 pp	18.5%	7.1%
Two or more races	9,719 ±1,165	15.1% ±1.8 pp	19.2%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 64,305
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Not Hispanic or Latino	43,682 ±1,448	67.9% ±2.3 pp	59.8%	80.7%
Hispanic or Latino	20,623 ±1,447	32.1% ±2.3 pp	40.2%	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: 21,838
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Married-couple family	11,420 ±603	52.3% ±2.3 pp	48.4%	46.9%
Other family: male householder, no spouse present	1,385 ±332	6.3% ±1.5 pp	6.3%	5.1%
Other family: female householder, no spouse present	2,800 ±435	12.8% ±2.0 pp	13.1%	12.2%
Nonfamily: householder living alone	4,649 ±560	21.3% ±2.5 pp	24.3%	28.7%
Nonfamily: householder not living alone	1,584 ±297	7.3% ±1.3 pp	7.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 21,838
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Households with people under 18	6,298 ±388	28.8% ±1.6 pp	32.4%	29.5%
Households without people under 18	15,540 ±815	71.2% ±3.1 pp	67.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 21,838
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
One-person nonfamily households	4,649 ±560	21.3% ±2.5 pp	24.3%	28.7%
Two-person households	6,978 ±703	32.0% ±3.1 pp	30.5%	33.8%
Three-person households	4,032 ±417	18.5% ±1.8 pp	16.7%	15.3%
Four-person households	3,821 ±340	17.5% ±1.5 pp	14.9%	12.6%
Five-person households	1,491 ±279	6.8% ±1.3 pp	7.7%	5.9%
Six-person households	482 ±150	2.2% ±0.7 pp	3.3%	2.2%
Seven or more people	385 ±114	1.8% ±0.5 pp	2.6%	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: 64,305
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Native	38,484 ±1,392	59.8% ±2.2 pp	73.0%	85.9%
Foreign born	25,821 ±1,389	40.2% ±2.2 pp	27.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 61,580
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
English only	28,450 ±1,444	46.2% ±2.3 pp	55.6%	77.7%
Spanish	12,777 ±1,164	20.7% ±1.9 pp	28.3%	13.6%
French, Haitian, or Cajun	191 ±161 · low precision	0.3% ±0.3 pp · low precision	0.4%	0.7%
German or other West Germanic	28 ±30 · low precision	0.0% ±0.0 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	527 ±256	0.9% ±0.4 pp	0.7%	0.7%
Other Indo-European	1,908 ±598	3.1% ±1.0 pp	3.5%	2.0%
Korean	162 ±109 · low precision	0.3% ±0.2 pp · low precision	1.0%	0.3%
Chinese, including Mandarin and Cantonese	7,026 ±929	11.4% ±1.5 pp	3.5%	1.1%
Vietnamese	216 ±107	0.4% ±0.2 pp	1.5%	0.5%
Tagalog, including Filipino	8,070 ±1,004	13.1% ±1.6 pp	2.1%	0.6%
Other Asian and Pacific Island	901 ±268	1.5% ±0.4 pp	2.0%	1.1%
Arabic	1,027 ±442	1.7% ±0.7 pp	0.6%	0.5%
Other and unspecified	297 ±267 · low precision	0.5% ±0.4 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: 48,451
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Less than high school graduate	6,786 ±868	14.0% ±1.8 pp	15.3%	10.4%
High school graduate or equivalency	9,433 ±818	19.5% ±1.6 pp	20.5%	26.0%
Some college, no degree	8,134 ±754	16.8% ±1.5 pp	19.3%	19.1%
Associate’s degree	4,325 ±503	8.9% ±1.0 pp	7.9%	8.8%
Bachelor’s degree	13,647 ±982	28.2% ±2.0 pp	22.7%	21.6%
Graduate or professional degree	6,126 ±641	12.6% ±1.3 pp	14.4%	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: 63,686
Category	Count ± MOE	Share ± MOE (pp)	California	U.S.
Same house	58,661 ±820	92.1% ±1.2 pp	89.2%	87.7%
Moved within same county	2,759 ±631	4.3% ±1.0 pp	6.4%	6.3%
Moved from a different county in the same state	1,475 ±370	2.3% ±0.6 pp	2.6%	3.1%
Moved from a different state	564 ±423 · low precision	0.9% ±0.7 pp · low precision	1.1%	2.3%
Moved from abroad	227 ±119 · low precision	0.4% ±0.2 pp · low precision	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

3.1% of South San Francisco residents (±0.9 percentage points) had no health insurance coverage when surveyed, compared with 6.6% in California and 8.4% nationally. 95.6% 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	South San Francisco	California	U.S.	Compared with California
People without health insurance Civilian noninstitutionalized population	3.1% ±0.9 pp	6.6%	8.4%	Lower
Households with a broadband subscription Households	95.6% ±4.0 pp	93.5%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	2.5% ±0.6 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 South San Francisco . 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 San Francisco housing and cost context or return to the city profile.