Dauphin -- U.S. County in Pennsylvania Population (2000): 251798 Housing Units (2000): 111133 Land area (2000): 525.289370 sq. miles (1360.493165 sq. km) Water area (2000): 32.243331 sq. miles (83.509841 sq. km) Total area (2000): 557.532701 sq. miles (1444.003006 sq. km) Located within: Pennsylvania (PA), FIPS 42 Location: 40.324487 N, 76.804656 W Headwords: Dauphin Dauphin, PA Dauphin County Dauphin County, PA