Niangua, MO -- U.S. city in Missouri Population (2000): 445 Housing Units (2000): 202 Land area (2000): 0.408793 sq. miles (1.058770 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.408793 sq. miles (1.058770 sq. km) FIPS code: 52418 Located within: Missouri (MO), FIPS 29 Location: 37.388793 N, 92.831077 W ZIP Codes (1990): 65713 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Niangua, MO Niangua