Oshkosh, WI is a city located in Winnebago County, Wisconsin and has a land area of 129.53 square miles (335.48 km2). The water area for the city is 11.02 square miles or 28.54 km2. There are 5 total unique zip codes in Oshkosh, Wisconsin. The area code(s) for Oshkosh is 920.
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