Idaho

Interstates

Route Miles driven Portions driven
Interstate 15 46.48
  • Interstate 86 in Pocatello to US Route 20 in Idaho Falls (46.48 mi)
Interstate 84 275.65 Clinched!
Western terminus: Interstate 84 in Oregon
Eastern terminus: Interstate 84 in Utah
Interstate 86 62.85 Clinched!
Western terminus: Interstate 84
Eastern terminus: Interstate 15
Interstate 90 73.89 Clinched!
Western terminus: Interstate 90 in Washington
Eastern terminus: Interstate 90 in Montana
Interstate 184 3.62 Clinched!
Western terminus: Interstate 84 US Route 30
Eastern terminus: US Route 20 US Route 26

US Routes

Route Miles driven Portions driven
US Route 20 302.1
  • Western terminus at US Route 20 US Route 26 in Oregon to Interstate 84 US Route 26 US Route 30 in Mountain Home (93.1 mi)
    42.2 mi concurrency with Interstate 84 US Route 30
    93.1 mi concurrency with US Route 26
  • US Route 26 US Route 93 in Carey to eastern terminus at US Route 20 in Montana (209.0 mi)
    44.2 mi concurrency with US Route 93
    67.6 mi concurrency with US Route 26
Business US Route 20 Business
2.1
  • Interstate 15 US Route 20 / Interstate 15 Business Loop to US Route 26 in Idaho Falls (2.1 mi)
    0.8 mi concurrency with Interstate 15 Business Loop
    1.3 mi concurrency with US Route 26
US Route 26 337.2
  • Western terminus at US Route 20 US Route 26 in Oregon to US Route 20 near Atomic City (271.2 mi)
    87.3 mi concurrency with Interstate 84
    160.7 mi concurrency with US Route 20
    83.9 mi concurrency with US Route 30
    82.3 mi concurrency with US Route 93
  • Portion concurrent with Interstate 15 from Blackfoot to Interstate 15 Business Loop in Idaho Falls (22.8 mi)
  • Interstate 15 Business Loop /
    Business US Route 20 Business
    in Idaho Falls to Idaho State Highway 31 in Swan Valley (43.2 mi)
    1.3 mi concurrency with
    Business US Route 20 Business
US Route 30 254.9
  • Western terminus at US Route 30 in Oregon to
    Business US Route 93 Business
    in Twin Falls (186.5)
    126.8 mi concurrency with Interstate 84
    42.2 mi concurrency with US Route 20
    83.9 mi concurrency with US Route 26
    4.0 mi concurrency with US Route 95
  • Portion concurrent with Interstate 84 from Heyburn to Interstate 86 (10.4 mi)
  • Portion concurrent with Interstate 86 from Interstate 84 to Pocatello (58.0 mi)
US Route 93 108.5
  • Grandview Dr N in Twin Falls to US Route 20 US Route 26 in Arco (108.5 mi)
    44.2 mi concurrency with US Route 20
    82.3 mi concurrency with US Route 20
Business US Route 93 Business
8.3 Clinched!
US Route 95 19.2
  • US Route 20 US Route 26 in Parma to US Route 30 in Fruitland (19.2 mi)
    7.9 mi concurrency with US Route 20 US Route 26
    3.8 mi concurrency with US Route 30

State Routes

Route Miles driven Portions driven
Idaho State Highway 31 21.03 Clinched!
Southern terminus: US Route 26 in Swan Valley
Northern terminus: Idaho State Highway 33 in Swan Valley
Idaho State Highway 33 13.8
  • Little Ave in Driggs to eastern terminus at Wyoming Highway 22 in Wyoming (13.8 mi)
Idaho State Highway 46 13.0
  • Interstate 84 in Wendell to 1700 South in Gooding (13.0 mi)
Idaho State Highway 51 15.8
  • Idaho State Highway 78 northeast of Bruneau to northern terminus at Interstate 84 Business Loop in Mountain Home (15.8 mi)
Idaho State Highway 55 11.6
  • Portion concurrent with Interstate 84 from Nampa to Meridian (11.6 mi)
Idaho State Highway 78 15.9
  • Idaho State Highway 51 northeast of Bruneau to eastern terminus at Interstate 84 Business Loop in Hammett (15.9 mi)