Terrell Hills, TX has a population of 5,190 and is the 6,291st largest city in the United States. The population density is 3,165 per sq mi which is 3165% higher than the Texas average and 3393% higher than the national average. The median age in Terrell Hills is 44 which is approximately 29% higher than the Texas average of 34. In Terrell Hills, 76% of the population over 15 years of age are married, 88% speak English and 11% speak Spanish. 68% of Terrell Hills residents were born in Texas, 27% were born out of state, 2% were born outside of the United States and 3% were foreign born.