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Boone County, Illinois Zip Codes
Zip Code
City
Population
61008
Belvidere
34,227
61065
Poplar Grove
10,681
61011
Caledonia
2,681
61012
Capron
2,424
61038
Garden Prairie
1,233
Population is the most recent figure from the U.S. Census Bureau's 2022
American Community Survey (ACS) 5-Year Estimates
.