[5] According to the United States Census Bureau, the town has a total area of 0.13 square miles (0.34 km2), all land.

42.5% of all households were made up of individuals, and 25% had someone living alone who was 65 years of age or older.

The racial makeup of the town was 95.24% White, 3.57% Native American, and 1.19% from two or more races.

27.9% of all households were made up of individuals, and 16.3% had someone living alone who was 65 years of age or older.

There were no families and 9.2% of the population living below the poverty line, including no under eighteens and 16.3% of those over 64.

Media related to Mound City, South Dakota at Wikimedia Commons