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Uniopolis is an unincorporated community and former village in Auglaize County, Ohio, United States. The population was 222 at the 2010 census. It is included in the Wapakoneta, Ohio Micropolitan Statistical Area. In 2013, voters chose to disincorporate Uniopolis into Union Township.
The community is served by the Wapakoneta City School District.
Uniopolis was founded in 1837. Its village hall, now a museum, is listed on the National Register of Historic Places.
Uniopolis is located at 40°36′7″N 84°5′12″W (40.601985, -84.086537).
According to the United States Census Bureau, the village had a total area of 0.16 square miles (0.41 km2), all land.
As of the census of 2010, there were 222 people, 83 households, and 64 families living in the village. The population density was 1,387.5 inhabitants per square mile (535.7/km2). There were 96 housing units at an average density of 600.0 per square mile (231.7/km2). The racial makeup of the village was 100.0% White.
There were 83 households of which 27.7% had children under the age of 18 living with them, 65.1% were married couples living together, 7.2% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 22.9% were non-families.