The median income of Franklin County residents was an inflation-adjusted $22,427 per year. Franklin County had 16,325 households in 2017, with a population of 41,397.
The county with the highest median resident income in the state was Williamson County. Williamson County's median income was $42,496 per year after adjusting for inflation – $20,069 more than Franklin County. It had 73,160 households in 2017 and a population of 212,161.
Fentress County had the lowest annual resident income among counties in Tennessee, with a median income of only $15,980 per year. That was $6,447 less than the median income in Franklin County at the time. Fentress County had 7,385 households in 2017 and a population of 17,940.
The table below shows the state's counties ranked by median annual resident earnings in 2017.