Merrill, IA -- U.S. city in Iowa Population (2000): 754 Housing Units (2000): 294 Land area (2000): 0.433459 sq. miles (1.122653 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.433459 sq. miles (1.122653 sq. km) FIPS code: 51375 Located within: Iowa (IA), FIPS 19 Location: 42.721461 N, 96.250779 W ZIP Codes (1990): 51038 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Merrill, IA Merrill