Post Offices List in Union County, Mississippi:
| Blue Springs Post Office | 1146 Highway 9 S, Blue Springs, MS 38828 |
| Etta Post Office | 1947 State Road 355, Etta, MS 38627 |
| Myrtle Post Office | 1183 Springdale Ave, Myrtle, MS 38650 |
| New Albany Post Office | 801 E Bankhead St, New Albany, MS 38652 |