San Marcos Flag

San Marcos

County:
Hays County
County Seat:
Yes
Area (mi²):
40.421
State:
Texas

San Marcos is a city located in Hays County, Texas. San Marcos has a 2026 population of 74,316. It is also the county seat of Hays County. San Marcos is currently growing at a rate of 3.31% annually and its population has increased by 8.93% since the most recent census, which recorded a population of 68,224 in 2020.

74.3K
Total Population
1,839
Density (mi²)
2.4K 3.31%
Growth

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)