Cottonwood is a small rural hamlet in Jackson County, South Dakota, United States.

[7] According to the United States Census Bureau, the town has a total area of 0.92 square miles (2.38 km2), all land.

There were 9 housing units at an average density of 9.8 per square mile (3.8/km2).

50.0% of all households were made up of individuals, and 16.7% had someone living alone who was 65 years of age or older.

There were 5 housing units at an average density of 5.4 per square mile (2.1/km2).

50.0% of all households were made up of individuals, and 50.0% had someone living alone who was 65 years of age or older.