The value of all farms and ranches for sale in Ohio's Defiance County recently was around $4 million, representing a combined 178 acres of land for sale in Defiance County. Defiance County ranks 88th out of 88 counties in Ohio for the combined amount of land currently advertised for sale. Defiance featured the most land for sale. Defiance County is Ohio's 67th biggest county (414 square miles). It's located in the Northwest Ohio region of the state.