Beavercreek is the largest city in Greene County, Ohio, United States, and is the second-largest suburb of Dayton. The population was 46,549 at the 2020 census. It is part of Metro Dayton. The Beavercr…Beavercreek is the largest city in Greene County, Ohio, United States, and is the second-largest suburb of Dayton. The population was 46,549 at the 2020 census. It is part of Metro Dayton. The Beavercreek area was settled in the early 1800s. A part of Beavercreek Township was incorporated and became the City of Beavercreek in February 1980.