Grantsburg, WI is a city located in Burnett County, Wisconsin and has a land area of 255.24 square miles (661.07 km2). The water area for the city is 9.69 square miles or 25.10 km2. There is one unique zip code in Grantsburg, Wisconsin and it is 54840. The area code(s) for Grantsburg is 715.
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