U.S. Route 20 in Idaho

This article is about the section of U.S. Route 20 in Idaho. For the entire route, see U.S. Route 20.

U.S. Highway 20
Idaho Medal of Honor Highway
US 20 highlighted in red
Route information
Maintained by ITD
Length406.30 mi (653.88 km)
Existed1940–present
Major junctions
West end US 20 / US 26 at the Oregon state line in Nyssa, OR
Major intersections
East end US 20 at the Montana state line near West Yellowstone, MT
Location
CountryUnited States
StateIdaho
CountiesPayette, Canyon, Ada, Elmore, Camas, Blaine, Butte, Bingham, Bonneville, Jefferson, Madison, Fremont
Highway system
  • Idaho State Highway System
← SH-19→ SH-21

U.S. Highway 20 (US 20) is the portion of an east–west United States Numbered Highway in the state of Idaho. It begins northwest of Parma at the Oregon state line and enters Montana 9.6 miles (15.4 km) away from the Yellowstone National Park west entrance.

Since 2019, US 20 has been designated as the Idaho Medal of Honor Highway.

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