San Marcos Ca Population 2025 Estimate. The january 1, 2023 population estimate for the city of san marcos is 86,059. Aterio data team has developed an ai enhanced model that helps organizations understand the forecasted growth of population in san marcos, ca for years 2025 through 2030.

The city of san marcos boasts a total population of 94,927, thriving within an area spanning 24.6 square miles. Quickfacts provides statistics for all states and counties.