Dayton is a city in and the county seat of Montgomery County, Ohio, United States. A small part of the city extends into Greene County. A…Dayton is a city in and the county seat of Montgomery County, Ohio, United States. A small part of the city extends into Greene County. As of the 2020 census, the city proper had a population of 137,644, making it the sixth-most populous city in Ohio. It anchors the state's fourth-largest metropolitan area, the Dayton metropolitan area, which had 814,049 residents. Dayton is located within Ohio's Miami Valley region, 50 miles north of Cincinnati and 60 miles west of Columbus.
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