Decaturville is a town in and the county seat of Decatur County, Tennessee, United States. The population was 859 at the 2000 census. It is named for war hero Stephen Decatur, Jr.
Decaturville is located at 35°34′59″N 88°7′19″W / 35.58306°N 88.12194°W / 35.58306; -88.12194 (35.582983, -88.122021).
According to the United States Census Bureau, the town has a total area of 1.7 square miles (4.4 km²), all of it land.