Defiance County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 39,037. Its county seat is Defiance. The county was named after an early Army fortification, Fort Defiance, which was so named by Mad Anthony Wayne to signify the settlers' "defiance" of the Indians.The Defiance, OH Micropolitan Statistical Area includes all of Defiance County.