Founded in 1881, Custer County is one of 44 counties in the state of Idaho. Historically, Custer County was formed from Alturas and Lemhi Counties. The city of Challis is the county seat. With FIPS code of 37, Custer County has a population of 4,428 and area of 4,926 square miles (12,758 km2).
List of all cities in Custer County, ID alphabetically
| City/Town | Postal Code | Area Code |
| Bonanza, ID | 83278 | 208 |
| Challis, ID | 83226 | 208 |
| Chilly, ID | 83251 | 208 |
| Clayton, ID | 83227 | 208 |
| Ellis, ID | 83235 | 208 |
| Lower Stanley, ID | 83278 | 208 |
| Mackay, ID | 83251 | 208 |
| Redfish Lake, ID | 83278 | 208 |
| Stanley, ID | 83278 | 208 |
| Sunbeam, ID | 83278 | 208 |
| Torrey, ID | 83227 | 208 |