San Marcos is a city located in Hays County Texas. It is also the county seat of Hays County. With a 2020 population of 66,952, it is the 60th largest city in Texas and the 565th largest city in the United States . San Marcos is currently growing at a rate of 1.65% annually and its population has increased by 49.13% since the most recent census, which recorded a population of 44,894 in 2010. San Marcos reached it's highest population of 66,952 in 2021. Spanning over 34 miles, San Marcos has a population density of 1,961 people per square mile.
The average household income in San Marcos is $54,535 with a poverty rate of 32.15%. The median rental costs in recent years comes to $1,064 per month, and the median house value is $171,500. The median age in San Marcos is 24.2 years, 25.3 years for males, and 22.9 years for females.