Butler is a town in Day County, South Dakota, United States.

[7] According to the United States Census Bureau, the town has a total area of 0.29 square miles (0.75 km2), all land.

There were 12 housing units at an average density of 41.4 per square mile (16.0/km2).

There were 7 housing units at an average density of 11.5 per square mile (4.4/km2).

No households were made up of individuals, and none had someone living alone who was 65 years of age or older.