List of U.S. Highways in Idaho

U.S. Highways of the Idaho State Highway System
U.S. Highways of the Idaho State Highway System
	Highway markers for U.S. Highways 2, 95, and 195
System information
	Maintained by ITD
Highway names
Interstates	Interstate n (I-n)
US Highways	U.S. Highway n (US-n)
State	Idaho State Highway n (SH-n)
System links
	Idaho State Highway System; Interstate; US; State;

The U.S. Highways in Idaho are the segments of the United States Numbered Highway System owned and maintained by the Idaho Transportation Department (ITD) in the U.S. state of Idaho.

Mainline highways


Number	Length (mi)^[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
US 2	80.152	128.992	US 2 / SH-41 in Oldtown	US 2 near Moyie Springs	01926-01-011926	current
US 10	193.23	310.97	US 10 in State Line	US 10 at Lookout Pass	01926-01-011926	01977-01-011977	Replaced by I-90
US 12	174.210	280.364	US 12 in Lewiston	US 12 at Lolo Pass	01962-01-011962	current
US 20	406.300	653.876	US 20 / US 26 near Parma	US 20 near West Yellowstone, MT	01940-01-011940	current
US 26	402.500	647.761	US 20 / US 26 near Parma	US 26 near Alpine, WY	01952-01-011952	current
US 30	455.481	733.026	US 30 near Fruitland	US 30 near Montpelier	01926-01-011926	current
US 30N	—	—	—	—	—	—
US 30N	—	—	—	—	—	—
US 30S	—	—	—	—	—	—
US 89	44.24	71.20	US 89 near Fish Haven	US 89 near Geneva	01939-01-011939	current
US 91	122.866	197.734	US 91 near Preston	US 26 in Idaho Falls	01926-01-011926	current
US 93	350.819	564.588	US 93 near Jackpot, NV	US 93 at Lost Trail Pass	01926-01-011926	current
US 95	538.562	866.732	US 95 near Homedale	BC 95 near Eastport	01926-01-011926	current
US 95E	—	—	—	—	—	—
US 95W	—	—	—	—	—	—
US 191	—	—	US 191 near Malad City	US 191 at Targhee Pass	01926-01-011926	01978-01-011978	Replaced by I-15
US 195	0.577	0.929	US 95 near Lewiston	US 195 near Lewiston	01979-01-011979	current
US 287	—	—	US 287 at Raynolds Pass	US 287 at Targhee Pass	—	—	Replaced by SH-87
US 410	3	4.8	US 410 in Lewiston	US 95 in Lewiston	01926-01-011926	01967-01-011967	Replaced by US-12
US 630	—	—	US 630 near Weiser	US 95 in Weiser	01928-01-011928	01931-01-011931	Replaced by US-95 Spur
Former

Special routes


Number	Length (mi)^[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
US 10A	62.648	100.822	US 10A in Newport, WA	US 10A near Heron	01941-01-011941	01967-01-011967	Replaced with SH-200 and US-2
US 10 Bus.	—	—	—	—	—	—
US 20 Bus.	3.640	5.858	—	—	—	—	Serves Idaho Falls
US 20 Bus.	1.684	2.710	—	—	—	—	Serves Rigby
US 20 Bus.	2.879	4.633	—	—	—	—	Serves St. Anthony
US 20 Spur	—	—	—	—	—	—	Serves Boise
US 26 Bus.	2.981	4.797	—	—	—	—	Serves Ririe
US 30 Bus.	—	—	—	—	—	—	Serves Pocatello
US 30 Bus.	10.270	16.528	—	—	—	—	Serves Lava Hot Springs
US 91 Bus.	—	—	—	—	—	—	Serves McCammon
US 91 Bus.	—	—	—	—	—	—	Serves Inkom
US 93 Alt.	—	—	—	—	—	—
US 93 Bus.	8.110	13.052	—	—	—	—	Serves Twin Falls
US 93 Spur	0.91	1.46	—	—	—	—	Serves Twin Falls
US 93 Spur	0.391	0.629	—	—	—	—	Serves Challis
US 95 Bus.	1.420	2.285	—	—	—	—	Serves Cottonwood
US 95 Bus.	1.757	2.828	—	—	—	—	Serves Craigmont
US 95 Bus.	4.021	6.471	—	—	—	—	Serves Winchester
US 95 Bus.	—	—	—	—	—	—	Serves Bonners Ferry
US 95 Spur	—	—	—	—	—	—	Serves Payette
US 95 Spur	2.332	3.753	—	—	—	—	Serves Weiser
US 95 Spur	0.552	0.888	—	—	—	—	Connects to US 195
Former