Fredericksburg, IA -- U.S. city in Iowa Population (2000): 984 Housing Units (2000): 444 Land area (2000): 0.860219 sq. miles (2.227956 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.860219 sq. miles (2.227956 sq. km) FIPS code: 28965 Located within: Iowa (IA), FIPS 19 Location: 42.964586 N, 92.198465 W ZIP Codes (1990): 50630 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Fredericksburg, IA Fredericksburg