Troy is a city in and the county seat of Miami County, Ohio, United States, along the Great Miami River. The population was 26,305 at the 2020 …Troy is a city in and the county seat of Miami County, Ohio, United States, along the Great Miami River. The population was 26,305 at the 2020 census, making it Miami County's largest city and Ohio's 55th-largest. About 19 miles north of Dayton, Troy is part of the Dayton metropolitan area.
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