[4] According to the 2010 census, Milltown has a total area of 1.41 square miles (3.65 km2), all land.

There were 396 housing units at an average density of 280.9 per square mile (108.5/km2).

The racial makeup of the town was 97.7% White, 0.1% Native American, 0.4% Asian, and 1.8% from two or more races.

32.4% of all households were made up of individuals, and 15.6% had someone living alone who was 65 years of age or older.

The racial makeup of the town was 97.85% White, 0.64% Native American, and 1.50% from two or more races.

23.8% of all households were made up of individuals, and 13.3% had someone living alone who was 65 years of age or older.