StatisticSan MarcosCaliforniaNational
Population density (sq mi)3,75225691
Median age34.636.037.7
Male/Female ratio1.0:11.0:11.0:1
Married (15yrs & older)58%52%55%
Families w/ Kids under 1852%46%43%
Speak English65%56%79%
Speak Spanish26%29%13%

Key findings

  • The population density in San Marcos is 1366% higher than California
  • The median age in San Marcos is 4% lower than California
  • In San Marcos 71.30% of the population is White
  • In San Marcos 3.26% of the population is Black
  • In San Marcos 8.69% of the population is Asian

Compare San Marcos, CA Demographics


      San Marcos population breakdown by race

      RaceSan MarcosCaliforniaNational
      American Indian0.59%0.74%0.82%
      Native Hawaiian0.79%0.39%0.18%
      Mixed race5.97%4.62%3.06%
      Other race9.40%13.28%4.75%
      In San Marcos, 35.8% 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 Marcos age breakdown

      Marital status

      Age of children in married couples

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