Decatur (/dɪˈkeɪtər/ dih-KAY-tər) is a town in Meigs County, Tennessee, United States.Just west of Decatur, the Tennessee River flows around a blunt peninsula known as Armstrong Bend.Decatur is situated around the junction of Tennessee State Route 30, which connects the town to Athens to the east and Dayton to the west, and Tennessee State Route 58, which connects Decatur to Kingston to the north and Chattanooga to the south.According to the United States Census Bureau, the town has a total area of 2.6 square miles (6.7 km2), all of it land.As of the 2020 United States census, there were 1,563 people, 586 households, and 416 families residing in the town.