 union city is a village in darke county, ohio, united states. the population was 1,666 at the 2010 census. it is located directly across the state line from its twin city of union city, indiana.{{cite book|last1=mangus|first1=michael|last2=herman|first2=jennifer l.|title=ohio encyclopedia|url
Divided_cities Twin_cities Villages_in_Darke_County,_Ohio Villages_in_Ohio