Pioneer, IA -- U.S. city in Iowa Population (2000): 21 Housing Units (2000): 11 Land area (2000): 0.063046 sq. miles (0.163289 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.063046 sq. miles (0.163289 sq. km) FIPS code: 62985 Located within: Iowa (IA), FIPS 19 Location: 42.654422 N, 94.390775 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Pioneer, IA Pioneer