El Castillo, TX has a population of 269 and is the 23,023rd largest city in the United States. The population density is 9,671 per sq mi which is 9876% higher than the Texas average and 10574% higher than the national average. The median age in El Castillo is 25 which is approximately 26% lower than the Texas average of 34. In El Castillo, 84% of the population over 15 years of age are married, 0% speak English and 100% speak Spanish. 61% of El Castillo residents were born in Texas, 0% were born out of state, 0% were born outside of the United States and 39% were foreign born.