Allegany -- U.S. County in Maryland Population (2000): 74930 Housing Units (2000): 32984 Land area (2000): 425.419497 sq. miles (1101.831391 sq. km) Water area (2000): 4.398672 sq. miles (11.392507 sq. km) Total area (2000): 429.818169 sq. miles (1113.223898 sq. km) Located within: Maryland (MD), FIPS 24 Location: 39.621909 N, 78.802613 W Headwords: Allegany Allegany, MD Allegany County Allegany County, MD