Boone County, Illinois

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Boone County is a county located in the U.S. state of Illinois. As of the 2000 census, the population was 41,786. Its county seat is Belvidere, Illinois[1].

Boone County is one of two counties included in the Rockford, Metropolitan Statistical Area and is adjacent to the Chicago Metropolitan Statistical Area.



Boone County was formed in 1837 out of Winnebago County. It was named for Kentucky frontiersman Daniel Boone.


According to the U.S. Census Bureau, the county has a total area of 282 square miles (730.4 km2), of which 281 square miles (727.8 km2) is land and 1 square mile (2.6 km2) (0.24%) is water.

Adjacent counties

Major highways

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