| Locality | Post Code |
|---|---|
| Edna, Lyman | 57568 |
| Grass Rope, Lyman | 57569 |
| Hilmoe, Lyman | 57568 |
| Houston, Lyman | 57544 |
| Iona, Lyman | 57533 |
| Iron Mountain, Lyman | 57544 |
| Kennebec, Lyman | 57544 |
| Lower Brule, Lyman | 57548 |
| Lyman, Lyman | 57569 |
| McClure, Lyman | 57576 |
| Oacoma, Lyman | 57365 |
| Presho, Lyman | 57568 |
| Reliance, Lyman | 57569 |
| Sweeney, Lyman | 57568 |
| Vivian, Lyman | 57576 |