Custer -- U.S. County in Idaho Population (2000): 4342 Housing Units (2000): 2983 Land area (2000): 4925.445220 sq. miles (12756.844014 sq. km) Water area (2000): 11.344866 sq. miles (29.383068 sq. km) Total area (2000): 4936.790086 sq. miles (12786.227082 sq. km) Located within: Idaho (ID), FIPS 16 Location: 44.211630 N, 114.139033 W Headwords: Custer Custer, ID Custer County Custer County, ID