Miamisburg is a city in southern Montgomery County, Ohio, United States. The population was 19,923 at the 2020 census. A suburb of Dayton, i…Miamisburg is a city in southern Montgomery County, Ohio, United States. The population was 19,923 at the 2020 census. A suburb of Dayton, it is part of the Dayton metropolitan area. Named after the Miami people, Miamisburg is known for its industrial history, particularly its nuclear operations during World War II, and retail factors such as the Dayton Mall and surrounding commercial business area.
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