Lake Dallas, TX has a population of 7,575 and is the 4,891st largest city in the United States. The population density is 3,159 per sq mi which is 3159% higher than the Texas average and 3387% higher than the national average. The median age in Lake Dallas is 36 which is approximately 6% higher than the Texas average of 34. In Lake Dallas, 62% of the population over 15 years of age are married, 84% speak English and 14% speak Spanish. 60% of Lake Dallas residents were born in Texas, 28% were born out of state, 1% were born outside of the United States and 10% were foreign born.