From a total population of 52,927, San Marcos has a median age of 23.4. The average age of males, in San Marcos, is 23.9 while the average age of females is 22.9. When you compare this to median age of Texas, San Marcos is 10.5 years younger.
The median income of individuals, in San Marcos, is $16,270 while the average household income is $27,261. When comparing the median income of people living in San Marcos to the rest of Texas, the average income in San Marcos is $10,243 less.