Onawa Zip Codes - Monona County IA

Onawa, IA Zip Code Map

Onawa, IA is a city located in Monona County, Iowa and has a land area of 129.51 square miles (335.43 km2). The water area for the city is 1.61 square miles or 4.17 km2. There is one unique zip code in Onawa, Iowa and it is 51040. The area code(s) for Onawa is 712.

Zip Codes for Onawa, IA (1)
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51040 Onawa Monona

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