Houston, DE has a population of 389 and is the 21,036th largest city in the United States. The population density is 1,015 per sq mi which is 176% higher than the Delaware average and 1020% higher than the national average. The median age in Houston is 45 which is approximately 13% higher than the Delaware average of 40. In Houston, 64% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 44% of Houston residents were born in Delaware, 49% were born out of state, 3% were born outside of the United States and 4% were foreign born.