Thornville is a village in Perry County, Ohio, United States.

[5] Legend Valley in Thornville is the location of the Lost Lands music festival, hosted by Excision.

According to the United States Census Bureau, the village has a total area of 1.10 square miles (2.85 km2), all land.

There were 450 housing units at an average density of 409.1 per square mile (158.0/km2).

27.8% of all households were made up of individuals, and 12.7% had someone living alone who was 65 years of age or older.

The racial makeup of the village was 98.91% White, 0.41% Native American, and 0.68% from two or more races.

22.0% of all households were made up of individuals, and 10.3% had someone living alone who was 65 years of age or older.

Sheridan middle and high schools are within Thornville's zip code but are physically located about six miles southeast of the village along State Route 13, halfway between Thornville and Somerset.