U.S. Route 95 (US 95) is a major north–south United States Highway in the western United States. It travels through the states of Arizona, California, Nevada, Oregon, and Idaho, staying inland from the Pacific Coast. US 95 begins in San Luis, Arizona, at the Mexican border, where Calle 1—a short spur—leads to Highway 2 in San Luis Río Colorado, Sonora. Its northern terminus is at the Canadian border in Eastport, Idaho, where the roadway continues north as British Columbia Highway 95.
The Boise–Nampa, Idaho Metropolitan Statistical Area (MSA) is an area that encompasses Ada, Boise, Canyon, Gem, and Owyhee counties in southwestern Idaho, anchored by the cities of Boise and Nampa. It is the main component of the wider Boise–Mountain Home–Ontario, ID–OR Combined Statistical Area, which adds Elmore and Payette counties in Idaho and Malheur County, Oregon. It is the state's largest officially designated metropolitan area and includes Idaho's three largest cities: Boise, Nampa, and Meridian. Nearly 40 percent of Idaho's total population lives in the area.
U.S. Route 195 (US 195) is a north–south United States Highway, of which all but 0.65 miles of its 94.02 miles are within the state of Washington. The highway starts in rural Idaho north of the city of Lewiston as a state highway in an interchange with US 95. As the road crosses into Washington it becomes a state highway that connects communities in the Palouse region of Eastern Washington. US 195 travels north, serving the cities of Pullman, Colfax and Rosalia in Whitman County before continuing into Spokane County to its terminus in the city of Spokane at an interchange with Interstate 90 (I-90).
State Route 90 is a highway in Cochise County, Arizona that runs from the I-10 junction at Benson to a junction with State Route 80 between Bisbee and Tombstone. It is a north–south route north of Sierra Vista, and an east–west route east of the city. It passes through the San Pedro Riparian National Conservation Area at milepost 329; the riparian area makes up a large part of the southern section of the San Pedro Valley.
Oregon Route 201 is a north–south state highway in eastern Oregon. It currently runs from the Idaho state line just south of Adrian to Interstate 84 south of Huntington. Between the state line and Succor Creek Road, it is known the Homedale Spur No. 490. Between Succor Creek Road and Nyssa, it is known as the Succor Creek Highway No. 450, including the Homedale Spur of the same highway. Between Nyssa and Cairo Junction, it is part of the Central Oregon Highway No. 7 as a concurrency with U.S. Route 20 and U.S. Route 26, and north of Cairo Junction, it is the Olds Ferry-Ontario Highway No. 455. At the Idaho state line, Oregon Route 201 becomes State Highway 19.
Oregon Route 86 is an Oregon state highway running from Interstate 84 at Baker City to the Idaho state line at Oxbow. OR 86 comprises most of the Baker-Copperfield Highway No. 12. It is 67.82 miles (109.15 km) long and runs east–west. OR 86 has an unsigned spur near Halfway, which runs for 1.15 miles (1.85 km). Most of OR 86 is part of the Hells Canyon Scenic Byway.
Oregon Route 216 is an Oregon state highway running from U.S. Route 26 at Warm Springs Junction to U.S. Route 97 in Grass Valley. OR 216 is 61.30 miles (98.65 km) long and runs east–west.
Oregon Route 452 is an Oregon state highway running from OR 201 near Adrian to State Line Road at the Idaho state line. OR 452 is known as the Parma Spur No. 489. It is 2.75 miles (4.43 km) long and runs east–west, entirely within Malheur County.
State Route 129 (SR 129) is a state highway in Asotin County, Washington, United States. It travels north–south at the southeastern corner of the state, connecting with Oregon Route 3 (OR 3) at the Oregon state line south of Anatone. The 43-mile (69 km) highway then follows the Snake River, which marks the Idaho state border, north to Clarkston and terminates at U.S. Route 12 (US 12). SR 129 also has a short spur route that connects to a separate intersection with US 12 in Clarkston.
State Highway 16 (SH-16) in Idaho is a 16-mile (26 km) route, connecting Emmett with US-20/US-26 and Star.
State Highway 55 (SH-55) is an Idaho highway from Marsing to New Meadows, connecting with US-95 at both ends.
State Route 290 (SR 290), named Hamilton Street and Trent Avenue, is an 18-mile (29 km) long state highway serving Spokane County in the U.S. state of Washington. SR 290 travels parallel to a Union Pacific railroad from Interstate 90 (I-90) in Spokane through Millwood and across the Spokane River thrice towards Spokane Valley, where the highway intersects SR 27. From Spokane Valley, the roadway continues to the Idaho state border, where it becomes Idaho State Highway 53.
State Highway 52 (SH-52) is a 54.126-mile-long (87.107 km) state highway in the U.S. state of Idaho that travels along the Payette River from the Oregon State Line and Snake River to Horseshoe Bend.
State Highway 75 is a two-lane highway in the western United States that travels through the Sawtooth Valley of central Idaho. The highway's southern terminus is in Shoshone, and its northern is near Challis. It is designated as one of Idaho's scenic byways and provides access to Sawtooth National Recreation Area and primarily follows the Big Wood River in the south and the main Salmon River in the north, divided by Galena Summit.
In the U.S. state of Idaho, U.S. Route 95 (US-95) is a north–south highway near the western border of the state, stretching from Oregon to British Columbia for over 538 miles (866 km); it was earlier known in the state as the North and South Highway.
U.S. Route 20 (US 20) is a major west–east cross-state highway in the northern part of the U.S. state of Oregon, especially east of the Cascade Mountains. It connects U.S. Route 101 in Newport on the central Oregon Coast to the Idaho state line east of Nyssa.
Payette Junction is a highway junction and unincorporated community in Malheur County, Oregon, United States. It lies at the intersection of Oregon Route 52 and Oregon Route 201 between Ontario, Oregon, and Weiser, Idaho. It is about a mile from Payette, Idaho, on the other side of the Snake River, which marks the Oregon–Idaho border in this vicinity.
Several special routes of U.S. Route 95 exist. In order from south to north they are as follows.
State Highway 19 (SH-19) is a state highway in Idaho from the Oregon state line to Interstate 84 (I-84) and U.S. Route 30 (US 30) in Caldwell. SH-19 is signed as an east–west highway.
State Highway 72 (SH‑72) is a 1.989-mile (3.201 km) state highway in Payette County, Idaho, United States, that connects U.S. Route 30 (US 30), south of new Plymouth, with Idaho State Highway 52 (SH‑52) in Hamilton Corner. SH‑72 is maintained by the Idaho Transportation Department.
OR 201 at Payette Junction 
SH-52 near Payette, Idaho 
