San Marcos is a city located in California. With a 2020 population of 97,032, it is the 80th largest city in California and the 336th largest city in the United States. San Marcos is currently growing at a rate of 0.19% annually and its population has increased by 15.82% since the most recent census, which recorded a population of 83,781 in 2010. San Marcos reached it's highest population of 97,032 in 2021. 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 11.34%. The median rental costs in recent years comes to $1,704 per month, and the median house value is $538,200. The median age in San Marcos is 35.5 years, 34.8 years for males, and 36.2 years for females. For every 100 females there are 96.8 males.