Post Offices List in Union County, South Carolina:
| Buffalo Post Office | 857 Main St, Buffalo, SC 29321 |
| Carlisle Post Office | 4512 King Kennedy St, Carlisle, SC 29031 |
| Jonesville Post Office | 2912 Furman L Fendley Hwy, Jonesville, SC 29353 |
| Lockhart Post Office | 404 S 2nd St, Lockhart, SC 29364 |
| Union Post Office | 804 Industrial Park Rd, Union, SC 29379 |