San Elizario, TX has a population of 9,144 and is the 4,210th largest city in the United States. The population density is 1,329 per sq mi which is 1270% higher than the Texas average and 1366% higher than the national average. The median age in San Elizario is 25 which is approximately 27% lower than the Texas average of 34. In San Elizario, 56% of the population over 15 years of age are married, 9% speak English and 91% speak Spanish. 58% of San Elizario residents were born in Texas, 6% were born out of state, 2% were born outside of the United States and 33% were foreign born.