Smithville, TN is a city located in Dekalb County, Tennessee and has a land area of 154.59 square miles (400.39 km2). The water area for the city is 11.46 square miles or 29.68 km2. There is one unique zip code in Smithville, Tennessee and it is 37166. The area code(s) for Smithville is 615/931.
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