Founded in 1919, Clark County is one of 44 counties in the state of Idaho. Historically, Clark County was formed from Fremont County. The city of Dubois is the county seat. With FIPS code of 33, Clark County has a population of 792 and area of 1,765 square miles (4,571 km2).
List of all cities in Clark County, ID alphabetically
| City/Town | Postal Code | Area Code |
| Argora, ID | 83423 | 208 |
| Dubois, ID | 83423 | 208 |
| 83446 | 208 | |
| Humphrey, ID | 83446 | 208 |
| Idman, ID | 83423 | 208 |
| Kilgore, ID | 83423 | 208 |
| Lidy Hot Springs, ID | 83423 | 208 |
| Reno, ID | 83423 | 208 |
| Small, ID | 83423 | 208 |
| Spencer, ID | 83446 | 208 |