Niagara, WI -- U.S. city in Wisconsin Population (2000): 1880 Housing Units (2000): 812 Land area (2000): 2.740240 sq. miles (7.097190 sq. km) Water area (2000): 0.269695 sq. miles (0.698508 sq. km) Total area (2000): 3.009935 sq. miles (7.795698 sq. km) FIPS code: 57325 Located within: Wisconsin (WI), FIPS 55 Location: 45.778244 N, 88.003867 W ZIP Codes (1990): 54151 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Niagara, WI Niagara