StatisticFoster CityCaliforniaNational
Population density (sq mi)8,68525691
Median age40.836.037.7
Male/Female ratio1.0:11.0:11.0:1
Married (15yrs & older)68%52%55%
Families w/ Kids under 1844%46%43%
Speak English49%56%79%
Speak Spanish3%29%13%

Key findings

  • The population density in Foster City is 3293% higher than California
  • The median age in Foster City is 13% higher than California
  • In Foster City 44.71% of the population is White
  • In Foster City 1.81% of the population is Black
  • In Foster City 46.94% of the population is Asian

Compare Foster City, CA Demographics


      Foster City population breakdown by race

      RaceFoster CityCaliforniaNational
      American Indian0.22%0.74%0.82%
      Native Hawaiian0.11%0.39%0.18%
      Mixed race5.38%4.62%3.06%
      Other race0.83%13.28%4.75%
      In Foster City, 4.5% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Foster City age breakdown

      Marital status

      Age of children in married couples

      Source: The Foster City, CA demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).