San Antonio, TX has a population of 1,439,358 and is the 7th largest city in the United States. The population density is 3,122 per sq mi which is 3121% higher than the Texas average and 3346% higher than the national average. The median age in San Antonio is 33 which is approximately 3% lower than the Texas average of 34. In San Antonio, 49% of the population over 15 years of age are married, 56% speak English and 40% speak Spanish. 65% of San Antonio residents were born in Texas, 18% were born out of state, 2% were born outside of the United States and 14% were foreign born.