Cranberry Prairie, OhioCranberry Prairie is an unincorporated community in southern Granville [Township, Mercer County, Ohio|Granville Township], Mercer [County, Ohio|Mercer County], in the U.S. state of Ohio.HistoryA post office called Cranberry Prairie was established in 1851, and remained in operation until 1904. Besides the post office, Cranberry Prairie has a Catholic church and a country store.