Dubuque -- U.S. County in Iowa Population (2000): 89143 Housing Units (2000): 35505 Land area (2000): 608.156422 sq. miles (1575.117834 sq. km) Water area (2000): 8.406666 sq. miles (21.773164 sq. km) Total area (2000): 616.563088 sq. miles (1596.890998 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.476090 N, 90.822022 W Headwords: Dubuque Dubuque, IA Dubuque County Dubuque County, IA