ZIP CodesZIP codes in Boone County, Illinois
Boone County, Illinois has 5 ZIP codes in this list, from 61008 to 61065. They cover 5 places, among them Belvidere, Caledonia, Capron and Garden Prairie.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 61008 | Belvidere | 84.3 | 42.260, -88.851 |
| 61011 | Caledonia | 38.5 | 42.383, -88.918 |
| 61012 | Capron | 36.2 | 42.409, -88.746 |
| 61038 | Garden Prairie | 42.7 | 42.251, -88.744 |
| 61065 | Poplar Grove | 50.9 | 42.359, -88.843 |
The ZIP code areas of Boone County add up to about 253 square miles of land (654 sq km) as the Census Bureau draws them. The largest is 61008 (Belvidere), with 84.3 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Belvidere, IL 61008.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.