Mount Summit is a town in Prairie Township, Henry County, Indiana, United States.

[6] According to the 2010 census, Mount Summit has a total area of 0.19 square miles (0.49 km2), all land.

There were 152 housing units at an average density of 800.0 per square mile (308.9/km2).

27.3% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older.

The racial makeup of the town was 98.40% White, 0.96% African American, and 0.64% from two or more races.

25.8% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.