There are 5 zip codes in Boone County, Illinois. The most populated is 61008, located in Belvidere. * 2024 populations estimated based on the latest ACS 5-year data.

CSV JSON
Zip Code
Population
City
6100834,227Belvidere
6106510,681Poplar Grove
610112,681Caledonia
610122,424Capron
610381,233Garden Prairie

Zip Codes in Boone County, Illinois by Population (2024)