In the fantastic area of San Marcos you’ll be in good company with around 99,796 residents with around 35% of those homeowners. With an average age of 31, San Marcos has a fairly young population filled with young professionals, new parents, and new homeowners. Over the recent months roughly 210 homes have been sold with an average sold price of $121,500. That is a decrease of $140,663 from the previous period.