Dayton, IA -- U.S. city in Iowa Population (2000): 884 Housing Units (2000): 379 Land area (2000): 0.831762 sq. miles (2.154254 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.831762 sq. miles (2.154254 sq. km) FIPS code: 19180 Located within: Iowa (IA), FIPS 19 Location: 42.262672 N, 94.069136 W ZIP Codes (1990): 50530 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Dayton, IA Dayton