It is named for American Revolutionary War Commodore 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).

[5] According to the United States Census Bureau, the town has a total area of 1.7 square miles (4.4 km2), all land.

As of the census[3] of 2000, there were 859 people, 349 households, and 214 families residing in the town.

There were 396 housing units at an average density of 235.6 per square mile (91.0/km2).

35.8% of all households were made up of individuals, and 17.5% had someone living alone who was 65 years of age or older.