San Marcos demographics profile

StatisticSan MarcosCaliforniaNational
Population density (sq mi)3,75223291
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%
San Marcos, CA has a population of 91,479 and is the 355th largest city in the United States. The population density is 3,752 per sq mi which is 1515% higher than the California average and 4041% higher than the national average. The median age in San Marcos is 35 which is approximately 4% lower than the California average of 36. In San Marcos, 58% of the population over 15 years of age are married, 65% speak English and 26% speak Spanish. 54% of San Marcos residents were born in California, 22% were born out of state, 1% were born outside of the United States and 22% were foreign born.
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Did you know?

  • The population density in San Marcos is 1515% 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 or African American.
  • In San Marcos 8.69% of the population is Asian.

Compare San Marcos, CA Demographics To Other Cities

San Marcos population breakdown by race

RaceSan MarcosCaliforniaNational
Black or African American3.26%5.85%12.63%
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.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

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).
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