South San Francisco, CA Profile: Facts, Map & Data


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South San Francisco, California - Basic Facts

The City of South San Francisco had a population of 66,748 as of July 1, 2017. South San Francisco ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in California. See peer rankings below.

The primary coordinate point for South San Francisco is located at latitude 37.6551 and longitude -122.3762 in San Mateo County. The formal boundaries for the City of South San Francisco (see map below) encompass a land area of 9.18 sq. miles and a water area of 21.02 sq. miles. San Mateo County is in the Pacific time zone (GMT -8). The elevation is 16 feet.

The City of South San Francisco (GNIS ID: 2411942) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

California is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of South San Francisco is located within South San Francisco CCD of San Mateo County.

Beneath the boundary map are tables with South San Francisco population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for South San Francisco: Baden.

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City of South San Francisco, CA Boundary Map

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South San Francisco, CA Data & Demographics (As of July 1, 2017)


Total Population 66,748
Daytime Population: Workers 40,934
Daytime Population: Residents 32,376
Total Daytime Population (TDP) 73,310
Ratio TDP/Total Population1 1.10
Population in Households 66,152
Population in Familes 55,515
Population in Group Qrtrs 596
Population Density2 7,273
Diversity Index3 84


Median Household Income $80,682
Average Household Income $103,452
Per Capita Income $34,316


Total Housing Units 22,624 (100%)
Owner Occupied HU 12,985 (57.4%)
Renter Occupied HU 8,893 (39.3%)
Vacant Housing Units 746 ( 3.3%)
Median Home Value $667,959
Average Home Value $703,186


Total Households 21,878
Average Household Size 3.02
Family Households 16,031
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.66% 0.67%
Households 0.61% 0.64%
Families 0.62% 0.64%
Median Household Income   1.96%
Per Capita Income   2.6%

South San Francisco, CA - Peer Comparisons by Rank and Percentile

The table below compares South San Francisco to the other 1,516 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 134 91st
Population Density # 127 92nd
Diversity Index # 207 86th
Median Household Income # 342 78th
Per Capita Income # 538 65th

Additional comparisons and rankings can be made with a VERY EASY TO USE California Census Data Comparison Tool.

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