Chattanooga, TN has a population of 175,462 and is the 140th largest city in the United States. The population density is 1,227 per sq mi which is 701% higher than the Tennessee average and 1254% higher than the national average. The median age in Chattanooga is 37 which is approximately 4% lower than the Tennessee average of 39. In Chattanooga, 46% of the population over 15 years of age are married, 93% speak English and 4% speak Spanish. 62% of Chattanooga residents were born in Tennessee, 32% were born out of state, 1% were born outside of the United States and 5% were foreign born.