Belvidere Township is one of nine townships in Boone County, Illinois, United States. As of the 2020 census, its population was 29,441 and …Belvidere Township is one of nine townships in Boone County, Illinois, United States. As of the 2020 census, its population was 29,441 and it contained 11,356 housing units. According to the 2010 census, the township has a total area of 36.54 square miles, of which 36.09 square miles is land and 0.45 square miles is water.
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