Flintville, TN has a population of 641 and is the 18,028th largest city in the United States. The population density is 120 per sq mi which is 21% lower than the Tennessee average and 33% higher than the national average. The median age in Flintville is 54 which is approximately 40% higher than the Tennessee average of 39. In Flintville, 81% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 55% of Flintville residents were born in Tennessee, 45% were born out of state, 0% were born outside of the United States and 0% were foreign born.