| Locality | Post Code |
|---|---|
| Argyle, Boone | 61011 |
| Belvidere, Boone | 61008 |
| Blaine, Boone | 61065 |
| Bonus, Boone | 61038 |
| Caledonia, Boone | 61011 |
| Candlewick Lake, Boone | 61065 |
| Capron, Boone | 61012 |
| Garden Prairie, Boone | 61038 |
| Machesney Park, Boone | 61011 |
| Poplar Grove, Boone | 61065 |