|Boone County Illinois Cities/Towns - Belvidere (County Seat), Caledonia, Capron, Loves Park, Poplar Grove, Timberlane
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Boone County is a county located in the U.S. state of Illinois. As of the 2016 census, the population was 53,503. Its county seat is Belvidere.
Boone County was formed in 1837. It was named for Kentucky frontiersman Daniel Boone.