Jefferson City, TN has a population of 8,324 and is the 4,563rd largest city in the United States. The population density is 1,272 per sq mi which is 731% higher than the Tennessee average and 1304% higher than the national average. The median age in Jefferson City is 33 which is approximately 15% lower than the Tennessee average of 39. In Jefferson City, 44% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 62% of Jefferson City residents were born in Tennessee, 34% were born out of state, 1% were born outside of the United States and 3% were foreign born.