| Locality | Post Code |
|---|---|
| Cairo, Louisa | 52738 |
| Columbus City, Louisa | 52737 |
| Columbus Junction, Louisa | 52738 |
| Conesville, Louisa | 52739 |
| Cotter, Louisa | 52738 |
| Cranston, Louisa | 52754 |
| Crawfordsville, Louisa | 52621 |
| Elrick, Louisa | 52653 |
| Fredonia, Louisa | 52738 |
| Gladwin, Louisa | 52738 |
| Grandview, Louisa | 52752 |
| Huron, Louisa | 52646 |
| Letts, Louisa | 52754 |
| Morning Sun, Louisa | 52640 |
| Oakville, Louisa | 52646 |
| Toolesboro, Louisa | 52653 |
| Wapello, Louisa | 52653 |
| Winfield, Louisa | 52659 |