Chelsea is a town in Faulk County, South Dakota, United States.

[7] According to the United States Census Bureau, the town has a total area of 0.32 square miles (0.83 km2), all land.

There were 15 housing units at an average density of 46.9 per square mile (18.1/km2).

38.5% of all households were made up of individuals, and 30.8% had someone living alone who was 65 years of age or older.

38.5% of all households were made up of individuals, and none had someone living alone who was 65 years of age or older.

There were 50.0% of families and 43.8% of the population living below the poverty line, including 100.0% of under eighteens and none of those over 64.