| Locality | Post Code |
|---|---|
| Bernice, Union | 71222 |
| Downsville, Union | 71234 |
| Eureka, Union | 71234 |
| Farmerville, Union | 71241 |
| Frost Town, Union | 71234 |
| Haile, Union | 71260 |
| Junction, Union | 71256 |
| Junction City, Union | 71256 |
| Lillie, Union | 71256 |
| Linville, Union | 71260 |
| Litroe, Union | 71260 |
| Lockhart, Union | 71277 |
| Marion, Union | 71260 |
| Mount Union, Union | 71277 |
| Oakland, Union | 71260 |
| Point, Union | 71234 |
| Rocky Branch, Union | 71241 |
| Shiloh, Union | 71222 |
| Spearsville, Union | 71277 |
| Sterlington, Union | 71280 |
| Weldon, Union | 71222 |
| Willhite, Union | 71234 |