Post Offices List in Charles Mix County, South Dakota:
| Geddes Post Office | 312 Main Ave, Geddes, SD 57342 |
| Lake Andes Post Office | 499 Main St, Lake Andes, SD 57356 |
| Pickstown Post Office | 106 Lewis Ave, Pickstown, SD 57367 |
| Platte Post Office | 20 E 5th St, Platte, SD 57369 |
| Wagner Post Office | 109 2nd St Se, Wagner, SD 57380 |
| Marty Post Office | 9105 College Loop, Marty, SD 57361 |