
Smithville
- County:
- DeKalb County
- County Seat:
- Yes
- Area (mi²):
- 5.854
- State:
- Tennessee
Smithville is a city located in DeKalb County, Tennessee. Smithville has a 2025 population of 5,625. It is also the county seat of DeKalb County. Smithville is currently growing at a rate of 2.12% annually and its population has increased by 11.56% since the most recent census, which recorded a population of 5,042 in 2020.
The average household income in Smithville is $39,391 with a poverty rate of 38.31%. The median age in Smithville is 42.3 years: 35.5 years for males, and 43.4 years for females.