Dallas, TX has a population of 1,278,433 and is the 9th largest city in the United States. The population density is 3,761 per sq mi which is 3779% higher than the Texas average and 4051% higher than the national average. The median age in Dallas is 33 which is approximately 5% lower than the Texas average of 34. In Dallas, 46% of the population over 15 years of age are married, 57% speak English and 38% speak Spanish. 55% of Dallas residents were born in Texas, 20% were born out of state, 1% were born outside of the United States and 24% were foreign born.