Post Offices List in Union Parish County, Louisiana:
| Bernice Post Office | 74 6th St, Bernice, LA 71222 |
| Downsville Post Office | 9507 Highway 145, Downsville, LA 71234 |
| Farmerville Post Office | 202 E Green St, Farmerville, LA 71241 |
| Lillie Post Office | 113 Highway 15, Lillie, LA 71256 |
| Marion Post Office | 302 Main St, Marion, LA 71260 |
| Spearsville Post Office | 1360 Highway 15, Spearsville, LA 71277 |