
San Marcos
- County:
- Hays County
- County Seat:
- Yes
- Area (mi²):
- 38.871
- State:
- Texas
San Marcos is a city located in Hays County, Texas. San Marcos has a 2025 population of 73,803. It is also the county seat of .San Marcos is currently growing at a rate of 1.54% annually and its population has increased by 8.19% since the most recent census, which recorded a population of 68,217 in 2020.
The average household income in San Marcos is $63,872 with a poverty rate of 26.7%. The median age in San Marcos is 25.5 years: 26.1 years for males, and 24.8 years for females.