Waterloo, IN -- U.S. town in Indiana Population (2000): 2200 Housing Units (2000): 898 Land area (2000): 1.500021 sq. miles (3.885036 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.500021 sq. miles (3.885036 sq. km) FIPS code: 81278 Located within: Indiana (IN), FIPS 18 Location: 41.431286 N, 85.022379 W ZIP Codes (1990): 46793 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Waterloo, IN Waterloo