Boone County Illinois is covered by a total of 14 ZIP Codes. There are 11 ZIP Codes in Boone County that extend into adjacent counties (DeKalb County, Mchenry County, and Winnebago County). Of the ZIP codes within or partially within Boone County there are 13 Standard ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Boone County and can be turned on and off. Each type of postal code can also be turned on and off.
| ZIP Code | ZIP Code City/Town | ZIP Code Type | |||
|---|---|---|---|---|---|
| Harvard | Standard | |||
| Kingston | Standard | |||
| Kirkland | Standard | |||
| Belvidere | Standard | |||
| Caledonia | Standard | |||
| Capron | Standard | |||
| Cherry Valley | Standard | |||
| Garden Prairie | Standard | |||
| Poplar Grove | Standard | |||
| Roscoe | Standard | |||
| South Beloit | Standard | |||
| Rockford | Standard | |||
| Loves Park | Standard | |||
| Rockford | Standard |