Defiance is a city in Defiance County, Ohio, United States, and its county seat. The population was 17,066 at the 2020 census. It is located at t…Defiance is a city in Defiance County, Ohio, United States, and its county seat. The population was 17,066 at the 2020 census. It is located at the confluence of the Auglaize and Maumee rivers about 55 miles southwest of Toledo and 47 miles northeast of Fort Wayne, Indiana, in Ohio's northwestern corner.
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