Post Offices List in Gregory County, South Dakota:
| Bonesteel Post Office | 405 Mellette St, Bonesteel, SD 57317 |
| Burke Post Office | 833 Main St, Burke, SD 57523 |
| Fairfax Post Office | 412 Main St, Fairfax, SD 57335 |
| Gregory Post Office | 517 Main St, Gregory, SD 57533 |
| Herrick Post Office | 727 Herrick Ave, Herrick, SD 57538 |