San Marcos is a city located in San Diego County California. With a 2020 population of 97,043, it is the 78th largest city in California and the 359th largest city in the United States. San Marcos is currently growing at a rate of 1.15% annually and its population has increased by 0.86% since the most recent census, which recorded a population of 96,219 in 2020. Spanning over 24 miles, San Marcos has a population density of 3,984 people per square mile.
The average household income in San Marcos is $105,999 with a poverty rate of 10.04%. The median rental costs in recent years comes to $1,802 per month, and the median house value is $584,600. The median age in San Marcos is 35.5 years, 34.8 years for males, and 36.2 years for females.
According to the most recent ACS, the racial composition of San Marcoswas:
Rate of Home Ownership
Average Family Size
Average Household Size
The highest rate of high school graduation is among islander people with a rate of 100.00%.
The highest rate of bachelors degrees is among islander people with a rate of 67.10%.
62.06% of San Marcos residents speak only English, while 37.94% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 27.78% of the population.
Overall Poverty Rate
Male Poverty Rate
Female Poverty Rate
The race most likely to be in poverty in San Marcos is Islander, with 25.93% below the poverty level.
The race least likely to be in poverty in San Marcos is Multiple, with 7.33% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.82%. Among those working part-time, it was 15.04%, and for those that did not work, the poverty rate was 19.42%.
Number of Veterans
Veteran Poverty Rate
Veteran Disability Rate
Labor Force Participation
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Born in San Marcos
75.41% of San Marcos residents were born in the United States, with 54.17% having been born in California. 11.88% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.