| Locality | Post Code |
|---|---|
| Batson, Hardin | 77519 |
| Grayburg, Hardin | 77659 |
| Honey Island, Hardin | 77625 |
| Kountze, Hardin | 77625 |
| Lumberton, Hardin | 77657 |
| Rose Hill Acres, Hardin | 77657 |
| Saratoga, Hardin | 77585 |
| Silsbee, Hardin | 77656 |
| Sour Lake, Hardin | 77659 |
| Thicket, Hardin | 77374 |
| Village Mills, Hardin | 77663 |
| Votaw, Hardin | 77376 |
| Wildwood, Hardin | 77663 |