Knightsville is a town in Van Buren Township, Clay County, Indiana, United States.

It is part of the Terre Haute Metropolitan Statistical Area.

[8] According to the 2010 census, Knightsville has a total area of 1.04 square miles (2.69 km2), all land.

There were 303 housing units at an average density of 291.3 per square mile (112.5/km2).

20.1% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.

There were 232 housing units at an average density of 227.4 per square mile (87.8/km2).

19.7% of all households were made up of individuals, and 11.1% had someone living alone who was 65 years of age or older.