Post Offices List in Allendale County, South Carolina:
| Allendale Post Office | 315 Augusta Hwy, Allendale, SC 29810 |
| Fairfax Post Office | 190 Pickens Ave N, Fairfax, SC 29827 |
| Martin Post Office | 6545 Augusta Hwy, Martin, SC 29836 |
| Sycamore Post Office | 345 Main St W, Sycamore, SC 29846 |
| Ulmer Post Office | 219 Burtons Ferry Hwy, Ulmer, SC 29849 |