| Locality | Post Code |
|---|---|
| Addison, Hillsdale | 49220 |
| Allen, Hillsdale | 49227 |
| Camden, Hillsdale | 49232 |
| Cement City, Hillsdale | 49233 |
| Frontier, Hillsdale | 49239 |
| Hillsdale, Hillsdale | 49242 |
| Hudson, Hillsdale | 49247 |
| Jerome, Hillsdale | 49249 |
| Jonesville, Hillsdale | 49250 |
| Litchfield, Hillsdale | 49252 |
| Montgomery, Hillsdale | 49255 |
| Moscow, Hillsdale | 49257 |
| Mosherville, Hillsdale | 49258 |
| North Adams, Hillsdale | 49262 |
| Osseo, Hillsdale | 49266 |
| Pittsford, Hillsdale | 49271 |
| Prattville, Hillsdale | 49271 |
| Reading, Hillsdale | 49274 |
| Somerset, Hillsdale | 49281 |
| Somerset Center, Hillsdale | 49282 |
| Waldron, Hillsdale | 49288 |