Clarksville is a village in Clinton County, Ohio, United States.

[6] The village was named after Sarah Clark Hadley, the wife of an early settler.

There were 238 housing units at an average density of 517.4 per square mile (199.8/km2).

22.1% of all households were made up of individuals, and 7.4% had someone living alone who was 65 years of age or older.

There were 216 housing units at an average density of 444.9 per square mile (171.8/km2).

22.5% of all households were made up of individuals, and 6.3% had someone living alone who was 65 years of age or older.