Newton, IA -- U.S. city in Iowa Population (2000): 15579 Housing Units (2000): 7162 Land area (2000): 10.256604 sq. miles (26.564480 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 10.256604 sq. miles (26.564480 sq. km) FIPS code: 56505 Located within: Iowa (IA), FIPS 19 Location: 41.698591 N, 93.046860 W ZIP Codes (1990): 50208 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Newton, IA Newton