StatisticSan MateoCaliforniaNational
Population density (sq mi)8,42825691
Median age38.936.037.7
Male/Female ratio1.0:11.0:11.0:1
Married (15yrs & older)56%52%55%
Families w/ Kids under 1845%46%43%
Speak English55%56%79%
Speak Spanish22%29%13%

Key findings

  • The population density in San Mateo is 3192% higher than California
  • The median age in San Mateo is 8% higher than California
  • In San Mateo 60.32% of the population is White
  • In San Mateo 2.12% of the population is Black
  • In San Mateo 20.98% of the population is Asian

Compare San Mateo, CA Demographics


      San Mateo population breakdown by race

      RaceSan MateoCaliforniaNational
      American Indian0.34%0.74%0.82%
      Native Hawaiian1.63%0.39%0.18%
      Mixed race5.63%4.62%3.06%
      Other race8.98%13.28%4.75%
      In San Mateo, 26.8% 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

      San Mateo age breakdown

      Marital status

      Age of children in married couples

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