Clayton is a city in Montgomery County, Ohio, United States. The population was 13,310 at the 2020 census. A suburb of Dayton, it is …Clayton is a city in Montgomery County, Ohio, United States. The population was 13,310 at the 2020 census. A suburb of Dayton, it is part of the Dayton metropolitan area. The city was named after John Clayton, a War of 1812 veteran.
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