South San Francisco is a city in San Mateo County, California, United States, on the San Francisco Peninsula in the San Francisco Bay Ar…South San Francisco is a city in San Mateo County, California, United States, on the San Francisco Peninsula in the San Francisco Bay Area. Its location has been populated for more than 5,000 years. The city is colloquially termed "South City". The population was 66,105 at the 2020 census.
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