Statistic San Mateo California National
Population 103,619 39,512,223 328,239,523
Population density (sq mi) 8,539 256 91
Median age 37.8 36.0 37.7
Male/Female ratio 1.0:1 1.0:1 1.0:1
Married (15yrs & older) 58% 52% 55%
Families w/ Kids under 18 43% 46% 43%
Speak English 57% 56% 79%
Speak Spanish 18% 29% 13%
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Demographics Quick Facts

  • The population density in San Mateo is 3236% higher than California
  • The median age in San Mateo is 5% higher than California
  • In San Mateo 50.17% of the population is White
  • In San Mateo 2.20% of the population is Black
  • In San Mateo 24.35% of the population is Asian

Compare San Mateo, CA Demographics

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      San Mateo population breakdown by race

      Race San Mateo California National
      White 50.17% 61.26% 73.35%
      Black 2.20% 5.85% 12.63%
      Asian 24.35% 13.85% 5.22%
      American Indian 0.59% 0.74% 0.82%
      Native Hawaiian 2.33% 0.39% 0.18%
      Mixed race 8.18% 4.62% 3.06%
      Other race 12.18% 13.28% 4.75%
      In San Mateo, 24.5% 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

      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 United States Census Bureau American Community Survey (ACS).