| Locality | Post Code |
|---|---|
| Alma, Gratiot | 48801 |
| Ashley, Gratiot | 48806 |
| Bannister, Gratiot | 48807 |
| Breckenridge, Gratiot | 48615 |
| Carson City, Gratiot | 48811 |
| Elm Hall, Gratiot | 48830 |
| Elwell, Gratiot | 48832 |
| Hubbardston, Gratiot | 48845 |
| Ithaca, Gratiot | 48847 |
| Merrill, Gratiot | 48637 |
| Middleton, Gratiot | 48856 |
| North Star, Gratiot | 48862 |
| Perrinton, Gratiot | 48871 |
| Pompeii, Gratiot | 48874 |
| Riverdale, Gratiot | 48877 |
| Saint Louis, Gratiot | 48880 |
| Sumner, Gratiot | 48889 |
| Wheeler, Gratiot | 48662 |