U.S. Route 26 in Idaho partially coincident with U.S. Route 93 in Idaho
U.S. Route 26 (US 26) runs east–west across south central Idaho for 402.5 miles (647.8 km). US 26 enters the state from Oregon across the Snake River east of Nyssa, Oregon concurrent with US 20 and exits into Wyoming northwest of Alpine. US 26 runs through the large population centers of Boise and Idaho Falls, as well as the smaller communities of Parma, Notus, Garden City, Shoshone, Richfield, Carey, Arco, Blackfoot, Swan Valley, and Irwin.
For a vast majority of its route, US 26 is two-lane and rural, with the exception of portions in and around major towns and cities. It does have significant four-lane segments within the Boise metropolitan area and east of Idaho Falls. Despite its extensive length, US 26 has many hundreds of miles that run concurrently with other highways. In fact, its first 138.97 miles (223.65 km) in the state consists of concurrencies with any one of five different highways, principally US 20 and I-84. It has additional lengthy concurrencies with US 93, US 20 again, and I-15.
US 26 does have one business route in the state of Idaho, which runs through the small community of Ririe northeast of Idaho Falls.
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