Fairmount, TN has a population of 3,197 and is the 8,489th largest city in the United States. The population density is 713 per sq mi which is 366% higher than the Tennessee average and 687% higher than the national average. The median age in Fairmount is 36 which is approximately 6% lower than the Tennessee average of 39. In Fairmount, 67% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 57% of Fairmount residents were born in Tennessee, 40% were born out of state, 1% were born outside of the United States and 1% were foreign born.