 U.S. Route 191 | ||||||||||
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 US 191 highlighted in red | ||||||||||
| Route information | ||||||||||
| Maintained by ADOT and the BIA | ||||||||||
| Length | 516.50 mi[2] (831.23 km) | |||||||||
| Existed | June 25, 1981–present | |||||||||
| History | Redesignation of SR 63 and part of US 666 | |||||||||
| Tourist routes |   Coronado Trail Scenic Road[1] Tse'nikani Flat Mesa Rock Scenic Road[1] | |||||||||
| Major junctions | ||||||||||
| South end |   SR 80 / Historic US 80 near Douglas | |||||||||
| North end |   US 191 / BIA Route 12 at Utah state line | |||||||||
| Location | ||||||||||
| Country | United States | |||||||||
| State | Arizona | |||||||||
| Counties | Cochise, Graham, Greenlee, Apache | |||||||||
| Highway system | ||||||||||
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U.S. Route 191 (US 191) is a north–south U.S. Highway in eastern Arizona. The highway runs for 516.50 miles (831.23 km), making it Arizona's longest numbered highway. The highway begins at State Route 80 near Douglas and crosses over the Utah state line near Mexican Water in the Navajo Nation. Between Douglas and Utah, US 191 shares multiple concurrencies with I-10, US 70, US 180, US 60, SR 61, I-40, SR 264, and US 160.
Until 1981, the route taken by US 191 between I-40 in Chambers and the Utah state line was designated as SR 63. The route from SR 80 in Douglas to I-40 in Sanders was originally designated as part of US 666. US 666 was often associated with the biblical devil, due to the number 666 occasionally being considered the "number of the beast." The highway number caused discomfort with the general public and led to the constant sign theft of US 666 markers along the highway, prompting the redesignation of US 666 as a section of US 191 in 1992.
- ^ a b Arizona Department of Transportation (2014). "Arizona Parkways, Historic and Scenic Roads" (PDF). Phoenix: Arizona Department of Transportation. Archived from the original (PDF) on July 18, 2019. Retrieved September 11, 2018.
- ^ Roadway Inventory Management Section, Multimodal Planning Division (December 31, 2013). "2013 State Highway System Log" (PDF). Arizona Department of Transportation. Retrieved May 27, 2020.