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Foster City is a planned city located in San Mateo County, California. As of the 2010 census, the city had a total population 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 nation's safest cities, with an average of one murder per decade.
The 2010 United States Census reported that Foster City had a population of 30,567. The population density was 8,138.2 people per square mile (3,141.8/km²). The Census reported that 30,458 people (99.6% of the population) lived in households, 52 (0.2%) lived in non-institutionalized group quarters, and 57 (0.2%) were institutionalized.
There were 12,016 households, out of which 4,256 (35.4%) had children under the age of 18 living in them, 7,127 (59.3%) were opposite-sex married couples living together, 963 (8.0%) had a female householder with no husband present, 316 (2.6%) had a male householder with no wife present. There were 531 (4.4%) unmarried opposite-sex partnerships, and 75 (0.6%) same-sex married couples or partnerships. 2,807 households (23.4%) were made up of individuals and 860 (7.2%) had someone living alone who was 65 years of age or older. The average household size was 2.53. There were 8,406 families (70.0% of all households); the average family size was 3.04.