Oelwein, IA is a city located in Fayette County, Iowa and has a land area of 70.45 square miles (182.46 km2). The water area for the city is 0.09 square miles or 0.23 km2. There is one unique zip code in Oelwein, Iowa and it is 50662. The area code(s) for Oelwein is 319.
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