39°42′42″N 84°01′24″W / 39.71167°N 84.02333°W
Alpha is an unincorporated community in Greene County, Ohio, in the United States. It is located on the eastern side of the Dayton metropolitan area. A post office is located in Alpha, with the ZIP code of 45301.[1]
A post office called Alpha has been in operation since 1850.[2] The community is one of the oldest in the area.[3] Alpha was named for the first letter of the Greek alphabet because it was at, or on the site of, the first mill in the county.[4]
It was the location of a Pittsburgh, Cincinnati, Chicago and St. Louis Railroad railway station stop, of a railway that has been shut down and turned into a bike path.[5]
Alpha has also been known in the past as Harbine or Harbines.[6][7]