Beloit, WI -- U.S. city in Wisconsin Population (2000): 35775 Housing Units (2000): 14262 Land area (2000): 16.436489 sq. miles (42.570310 sq. km) Water area (2000): 0.228869 sq. miles (0.592768 sq. km) Total area (2000): 16.665358 sq. miles (43.163078 sq. km) FIPS code: 06500 Located within: Wisconsin (WI), FIPS 55 Location: 42.516564 N, 89.029964 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Beloit, WI Beloit