Milltown is a census-designated place (CDP) in Hutchinson County, South Dakota, United States.

[2] Milltown was so named for the fact many of its early residents milled their supply of flour.

[3] According to the United States Census Bureau, the CDP has a total area of 0.4 square miles (1.0 km2), all land.

As of the census[4] of 2000, there were 8 people, 6 households, and 1 family residing in the CDP.

66.7% of all households were made up of individuals, and 50.0% had someone living alone who was 65 years of age or older.