High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Defiance Township is one of the twelve townships of Defiance County, Ohio, United States. The 2000 census found 13,461 people in the township, 11,601 of whom lived in the city of Defiance, and 1,860 of whom lived in the unincorporated portions of the township. A large part of the county seat of Defiance is located in northern Defiance Township. It is the only Defiance Township statewide.