San Antonio Texas Population 2024 By Age. The median age in 2021 was 33.9 years, with a median income of. The san antonio population is 1,529,133, with a population density of 3,068 people per square mile, diverging from the national average of 91.
San antonio’s population is young compared to the rest of the country: Usafacts uses census data to break down the population of texas by race, age, and more.