5 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61008 | Belvidere | 33,697 |
| 61065 | Poplar Grove | 10,927 |
| 61011 | Caledonia | 2,743 |
| 61012 | Capron | 2,322 |
| 61038 | Garden Prairie | 1,395 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 5 ZCTAs in Boone County, Illinois (US Census).