Hillsdale -- U.S. County in Michigan Population (2000): 46527 Housing Units (2000): 20189 Land area (2000): 598.842655 sq. miles (1550.995291 sq. km) Water area (2000): 8.297997 sq. miles (21.491712 sq. km) Total area (2000): 607.140652 sq. miles (1572.487003 sq. km) Located within: Michigan (MI), FIPS 26 Location: 41.897234 N, 84.596622 W Headwords: Hillsdale Hillsdale, MI Hillsdale County Hillsdale County, MI