In Arizona, US 191 runs from AZ 80 in Douglas to the Utah state line near Mexican Water. From there, it continues north to the Canadian border. US 191 took over the route of US 666 in Arizona when it was removed from the state highway system in 1992.
Length: 1,624 miles in total, 517 miles in Arizona
Existed since: 1926 nationally, 1981 in Arizona
Current Route in Arizona: AZ 80 in Douglas to Utah state line near Mexican Water
Current Route Nationally: Douglas, AZ to Canadian border in Morgan, MT
Major Junctions: AZ 80, AZ 181, I-10, AZ 186, AZ 266, AZ 366, US 70, AZ 75, AZ 78, US 180, AZ 260, US 60, AZ 61, I-40, AZ 264, US 160
US 191 is the longest numbered highway in the state.
US 191 is very narrow and winding with hundreds of tight curves between Clifton and Alpine.
The northern end of US 191 within Arizona is unique because it is maintained by the Navajo Nation and signed as IR 12 with "TO US 191 North" signs.
US 191 Business
US 191T is the designation for a route of US 191 through the Morenci Mine. This used to be US 666 Temp until US 191 took over. This segment of US 191 is temporary because the road is constantly being moved so that the mine can continue to expand. There seem to be some plans to eventually permanently move US 191 west of the mine so that it doesn't need to be moved all the time, but they seem to be very far off.
Page last updated: 3/17/2023