Uniopolis is an unincorporated community and former village in Auglaize County, Ohio, United States.

[6] Its village hall, now a museum,[7] is listed on the National Register of Historic Places.

[8] According to the United States Census Bureau, the village had a total area of 0.16 square miles (0.41 km2), all land.

There were 96 housing units at an average density of 600.0 per square mile (231.7/km2).

16.9% of all households were made up of individuals, and 3.6% had someone living alone who was 65 years of age or older.

10.2% of all households were made up of individuals, and 3.4% had someone living alone who was 65 years of age or older.