Adelphi, OH -- U.S. village in Ohio Population (2000): 371 Housing Units (2000): 176 Land area (2000): 0.276186 sq. miles (0.715318 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.276186 sq. miles (0.715318 sq. km) FIPS code: 00450 Located within: Ohio (OH), FIPS 39 Location: 39.466041 N, 82.745707 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Adelphi, OH Adelphi