| Localité | Code postal |
|---|---|
| Blanchard, Isabella | 49310 |
| Clare, Isabella | 48617 |
| Coleman, Isabella | 48618 |
| Farwell, Isabella | 48622 |
| Lake, Isabella | 48632 |
| Lake Isabella, Isabella | 48893 |
| Millbrook, Isabella | 49310 |
| Mount Pleasant, Isabella | 48858, 48859 |
| Remus, Isabella | 49340 |
| Riverdale, Isabella | 48877 |
| Rosebush, Isabella | 48878 |
| Shepherd, Isabella | 48883 |
| Weidman, Isabella | 48893 |
| Winn, Isabella | 48896 |