Birnamwood, WI is a city located in Shawano County, Wisconsin and has a land area of 131.60 square miles (340.84 km2). The water area for the city is 0.66 square miles or 1.71 km2. There is one unique zip code in Birnamwood, Wisconsin and it is 54414. The area code(s) for Birnamwood is 715.
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