Foster City Map
Foster City Information
Foster City
Foster City is a city located in San Mateo County, California, United States. The 2020 census put the population at 33,805, an increase of more than 10% over the 2010 census figure of 30,567. Foster City is sometimes considered to be part of Silicon Valley for its local industry and its proximity to Silicon Valley cities. Foster City is one of the United States’ safest cities, with an average of one murder per decade.