Dilley, TX has a population of 4,168 and is the 7,256th largest city in the United States. The population density is 1,789 per sq mi which is 1745% higher than the Texas average and 1874% higher than the national average. The median age in Dilley is 26 which is approximately 23% lower than the Texas average of 34. In Dilley, 35% of the population over 15 years of age are married, 46% speak English and 54% speak Spanish. 82% of Dilley residents were born in Texas, 11% were born out of state, 1% were born outside of the United States and 6% were foreign born.