| Locality | Post Code |
|---|---|
| Braceville, Grundy | 60407 |
| Carbon Hill, Grundy | 60416 |
| Coal City, Grundy | 60416 |
| Diamond, Grundy | 60416 |
| East Brooklyn, Grundy | 60474 |
| Eileen, Grundy | 60416 |
| Gardner, Grundy | 60424 |
| Kinsman, Grundy | 60437 |
| Mazon, Grundy | 60444 |
| Minooka, Grundy | 60447 |
| Morris, Grundy | 60450 |
| South Wilmington, Grundy | 60474 |
| Verona, Grundy | 60479 |