Post Offices List in Edgefield County, South Carolina:
| Edgefield Post Office | 325 Bacon St, Edgefield, SC 29824 |
| Johnston Post Office | 519 Calhoun St, Johnston, SC 29832 |
| Modoc Post Office | 11489 Sc Highway 28, Modoc, SC 29838 |
| Trenton Post Office | 113 Watson St, Trenton, SC 29847 |