List of state highways in Idaho
| Highway markers for State Highways 3, 75 and 200 | |
| Highway names | |
|---|---|
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Route X (US-X) |
| System links | |
| |
The Idaho Transportation Department (ITD) is responsible for the establishment and classification of a state highway network, including 5,000 miles (8,000 km) of roads that are classified as Interstate Highways, U.S. Highways, and state highways within the state of Idaho in the United States. The current state highway marker consists of a white background, black numbering, and a solid black geographic outline of the state of Idaho.