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is a city in DeKalb County, Tennessee, United States. The population was 3,994 at the 2000 census. It is the county seat of De Kalb County.
Smithville is located at (35.957191, -85.820756), approximately 25 miles west of Cookeville and 70 miles east of Nashville.
According to the United States Census Bureau, the city has a total area of 5.9 square miles (15.2 km²), all of it land.