From a total population of 79,114, San Marcos has a median age of 34.9. The average age of males, in San Marcos, is 34.2 while the average age of females is 35.7. When you compare this to median age of California, San Marcos is 0.7 years younger.
The median income of individuals, in San Marcos, is $24,789 while the average household income is $56,139. When comparing the median income of people living in San Marcos to the rest of California, the average income in San Marcos is $5,117 less.