Louisville, TN has a population of 4,114 and is the 7,320th largest city in the United States. The population density is 276 per sq mi which is 80% higher than the Tennessee average and 204% higher than the national average. The median age in Louisville is 48 which is approximately 25% higher than the Tennessee average of 39. In Louisville, 67% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 61% of Louisville residents were born in Tennessee, 35% were born out of state, 1% were born outside of the United States and 3% were foreign born.