Lake Tanglewood, TX has a population of 804 and is the 16,574th largest city in the United States. The population density is 715 per sq mi which is 638% higher than the Texas average and 690% higher than the national average. The median age in Lake Tanglewood is 58 which is approximately 68% higher than the Texas average of 34. In Lake Tanglewood, 79% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 65% of Lake Tanglewood residents were born in Texas, 33% were born out of state, 0% were born outside of the United States and 2% were foreign born.