Allegheny Co., was very large before 1880 and included where Crawford Co., was. From "Map Guide to the U.S. Federal Censusses 1790-1920."
From Ohio Marriages 1800-1958, Maggie Williams born Cochranton, PA in 1879 married Henry J. Reno on 13 Aug 1901 at Mahoning Co., OH. The bride's father was Abraham Williams and the groom's parents were Herman Reno and Julia Morell.