100 Largest ZIP Codes in the United States by Population in Boone County, Illinois
Explore the 100 largest ZIP codes in the United States ranked by population using U.S. Census demographic data. This page lists ZIP codes located in Boone County, Illinois.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 61008 | BELVIDERE | IL | 34,227 |
| 2 | 61065 | POPLAR GROVE | IL | 10,681 |
| 3 | 61011 | CALEDONIA | IL | 2,681 |
| 4 | 61012 | CAPRON | IL | 2,424 |
| 5 | 61038 | GARDEN PRAIRIE | IL | 1,233 |