San Marcos is a city located in Texas. With a 2020 population of 66,583, it is the 59th largest city in Texas and the 573rd largest city in the United States. San Marcos is currently growing at a rate of 2.36% annually and its population has increased by 48.31% since the most recent census, which recorded a population of 44,894 in 2010. Spanning over 34 miles, San Marcos has a population density of 1,950 people per square mile.
The average household income in San Marcos is $51,463 with a poverty rate of 34.36%. The median rental costs in recent years comes to $1,000 per month, and the median house value is $163,500. The median age in San Marcos is 24.1 years, 25 years for males, and 22.9 years for females. For every 100 females there are 94.8 males.