Post Offices List in Lyman County, South Dakota:
| Kennebec Post Office | 210 S Main St, Kennebec, SD 57544 |
| Lower Brule Post Office | 312 Crazy Horse Ave, Lower Brule, SD 57548 |
| Oacoma Post Office | 101 W 2nd St, Oacoma, SD 57365 |
| Presho Post Office | 210 N Main Ave, Presho, SD 57568 |
| Reliance Post Office | 202 W Highway 47, Reliance, SD 57569 |
| Vivian Post Office | 109 S Main Ave, Vivian, SD 57576 |