Post Offices List in Custer County, Idaho:
| Challis Post Office | 601 N Main Ave, Challis, ID 83226 |
| Clayton Post Office | 101 Main St, Clayton, ID 83227 |
| Ellis Post Office | 26375 Highway 93, Ellis, ID 83235 |
| Mackay Post Office | 111 S Main St, Mackay, ID 83251 |
| Stanley Post Office | 36 Ace Of Diamonds Blvd, Stanley, ID 83278 |