Boone County, Illinois ZIP Codes
- ZIP records
5 - Cities represented
5 - Sum of listed ZIP population estimates
50,366
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 61008 | Belvidere | 33,582 |
| 2 | 61065 | Poplar Grove | 10,570 |
| 3 | 61011 | Caledonia | 2,676 |
| 4 | 61012 | Capron | 2,264 |
| 5 | 61038 | Garden Prairie | 1,274 |
Cities in Boone County
ZIP Directory
Browse all ZIP data for Illinois
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.