| Locality | Post Code |
|---|---|
| Box Elder, Pennington | 57719 |
| Cactus Flats, Pennington | 57775 |
| Caputa, Pennington | 57725 |
| Conata, Pennington | 57780 |
| Cottonwood, Pennington | 57775 |
| Creighton, Pennington | 57790 |
| Deerfield, Pennington | 57745 |
| Dowling, Pennington | 57790 |
| Farmingdale, Pennington | 57725 |
| Gumbo, Pennington | 57791 |
| Hill City, Pennington | 57745 |
| Hisega, Pennington | 57702 |
| Imlay, Pennington | 57780 |
| Jolly Acres, Pennington | 57701 |
| Keystone, Pennington | 57751 |
| Mystic, Pennington | 57745 |
| New Underwood, Pennington | 57761 |
| Old Town, Pennington | 57701 |
| Owanka, Pennington | 57767 |
| Pactola Lake, Pennington | 57702 |
| Quinn, Pennington | 57775 |
| Rapid City, Pennington | 57701, 57702, 57703, 57709 |
| Rochford, Pennington | 57745 |
| Rockerville, Pennington | 57701, 57702 |
| Scenic, Pennington | 57780 |
| Silver City, Pennington | 57702 |