Loudon, TN has a population of 5,701 and is the 5,947th largest city in the United States. The population density is 456 per sq mi which is 198% higher than the Tennessee average and 404% higher than the national average. The median age in Loudon is 39 which is approximately equal to the Tennessee average of 39. In Loudon, 68% of the population over 15 years of age are married, 79% speak English and 21% speak Spanish. 63% of Loudon residents were born in Tennessee, 22% were born out of state, 1% were born outside of the United States and 13% were foreign born.