Roscommon -- U.S. County in Michigan Population (2000): 25469 Housing Units (2000): 23109 Land area (2000): 521.399770 sq. miles (1350.419147 sq. km) Water area (2000): 58.443533 sq. miles (151.368050 sq. km) Total area (2000): 579.843303 sq. miles (1501.787197 sq. km) Located within: Michigan (MI), FIPS 26 Location: 44.355243 N, 84.654418 W Headwords: Roscommon Roscommon, MI Roscommon County Roscommon County, MI