The population grew from less than 2,000 in 1910 to more than 65,000 in 2024. It more than tripled in the thirty years following World War II with the opening of such subdivisions as Buri Buri, Winston Manor and Westborough on the slopes west of El Camino. The city has grown about 30% since 1985 as smaller fallow and commercial properties were developed, and single-family homes in the downtown area were replaced by denser housing.
2020 census As of the
2020 census, South San Francisco had a population of 66,105. The population density was . The census reported that 99.4% of the population lived in households, 0.6% lived in non-institutionalized group quarters, and 0.0% were institutionalized. The census also reported that 100.0% of residents lived in urban areas, while 0.0% lived in rural areas. There were 21,803 households, out of which 32.7% had children under the age of 18 living in them. Of all households, 51.9% were married-couple households, 6.4% were
cohabiting couple households, 16.5% had a male householder with no spouse or partner present, and 25.2% had a female householder with no spouse or partner present. 20.2% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 3.01, and there were 15,803
families (72.5% of all households).
2010 census The
2010 United States census reported that South San Francisco had a population of 63,632. The population density was . The racial makeup of South San Francisco was 23,760 (37.3%)
White, 1,625 (2.6%)
African American, 395 (0.6%)
Native American, 23,293 (36.6%)
Asian, 1,111 (1.7%)
Pacific Islander, 9,598 (15.1%) from
other races, and 3,850 (6.1%) from two or more races.
Hispanic or
Latino of any race were 21,645 persons (34.0%). Among the Hispanic population, 13,194 (20.7%) are
Mexican, 571 (0.9%) are
Puerto Rican, 92 (0.1%) are
Cuban, and 7,788 (12.2%) are other Hispanic or Latino. The Census reported that 63,053 people (99.1% of the population) lived in households, 528 (0.8%) lived in non-institutionalized group quarters, and 51 (0.1%) were institutionalized. There were 20,938 households, out of which 7,588 (36.2%) had children under the age of 18 living in them, 11,165 (53.3%) were married couples, 2,897 (13.8%) had a female householder with no husband present, 1,268 (6.1%) had a male householder with no wife present. There were 1,083 (5.2%) unmarried couples, and 187 (0.9%) same-sex couples. 4,299 households (20.5%) were made up of individuals, and 1,857 (8.9%) had someone living alone who was 65 years of age or older. The average household size was 3.01. There were 15,330
families (73.2% of all households); the average family size was 3.45. The population was spread out, with 13,787 people (21.7%) under the age of 18, 5,668 people (8.9%) aged 18 to 24, 18,645 people (29.3%) aged 25 to 44, 17,203 people (27.0%) aged 45 to 64, and 8,329 people (13.1%) who were 65 years of age or older. The median age was 38.1 years. For every 100 females, there were 97.6 males. For every 100 females age 18 and over, there were 95.7 males. There were 21,814 housing units at an average density of , of which 12,614 (60.2%) were owner-occupied, and 8,324 (39.8%) were occupied by renters. The homeowner vacancy rate was 1.3%; the rental vacancy rate was 4.0%. 37,802 people (59.4% of the population) lived in owner-occupied housing units and 25,251 people (39.7%) lived in rental housing units. South San Francisco is a
middle class and
working class city. However, that image is quickly changing as a number of higher-priced homes have been built in recent years (particularly at the foot of the mountain that divides
Brisbane and South San Francisco) to take advantage of the city's close proximity to downtown San Francisco, the bio-tech industry, and the peninsula. There are also developments of two-and-three bedroom condominiums in the Westborough district and on El Camino Real near the South San Francisco BART station. Since 2007, construction has begun to add more than 1,000 apartments renting at more than $2,000 per month. The most commonly spoken language at home in 2000 was English (43.13%), followed by Spanish (28.36%), Tagalog (11.48%), Chinese languages like Mandarin and Cantonese (4.9%), Hindi (1.5%), Arabic (1.59%), although a locally large ethnic enclave - Italian (only 1.47%), Vietnamese (0.67%), Russian (0.56%), Korean and Japanese (0.6%), respectively, with other languages were spoken by less than half of one percent of the population. ==Economy==