Allegan -- U.S. County in Michigan Population (2000): 105665 Housing Units (2000): 43292 Land area (2000): 827.464729 sq. miles (2143.123718 sq. km) Water area (2000): 1005.834861 sq. miles (2605.100219 sq. km) Total area (2000): 1833.299590 sq. miles (4748.223937 sq. km) Located within: Michigan (MI), FIPS 26 Location: 42.592727 N, 85.903867 W Headwords: Allegan Allegan, MI Allegan County Allegan County, MI