Plainville is a town in Steele Township, Daviess County, Indiana, United States.

[5] According to the 2010 census, Plainville has a total area of 0.35 square miles (0.91 km2), all land.

There were 219 housing units at an average density of 625.7 per square mile (241.6/km2).

The racial makeup of the town was 97.7% White, 0.4% African American, 1.1% Asian, and 0.8% from two or more races.

29.4% of all households were made up of individuals, and 10.8% had someone living alone who was 65 years of age or older.

28.1% of all households were made up of individuals, and 18.1% had someone living alone who was 65 years of age or older.