Post Offices List in Marion County, South Carolina:
| Gresham Post Office | 7027 Highway 908, Gresham, SC 29546 |
| Marion Post Office | 201 S Main St, Marion, SC 29571 |
| Mullins Post Office | 320 N Main St, Mullins, SC 29574 |
| Centenary Post Office | 4811 S Highway 41a, Centenary, SC 29519 |
| Rains Post Office | 2677 Troy Atkinson Rd, Rains, SC 29589 |