what county is smithville tn in
Smithville, Tennessee. Smithville is a city in DeKalb County, Tennessee, United States. The population was 4,530 at the 2010 census, up from 3,994 at the 2000 census. It is the county seat of DeKalb County. Smithville is home to the Smithville Fiddler's Jamboree, which it has hosted annually since 1972.