| Locality | Post Code |
|---|---|
| Amistad, Union | 88410 |
| Bueyeros, Union | 88415 |
| Capulin, Union | 88414 |
| Clapham, Union | 88415 |
| Clayton, Union | 88415 |
| Des Moines, Union | 88418 |
| Farley, Union | 88422 |
| Folsom, Union | 88419 |
| Gladstone, Union | 88422 |
| Grenville, Union | 88424 |
| Hayden, Union | 88410 |
| Mount Dora, Union | 88424 |
| Rosebud, Union | 88410 |
| Sedan, Union | 88436 |
| Seneca, Union | 88415 |
| Sofia, Union | 88424 |
| Stead, Union | 88415 |
| Thomas, Union | 88415 |