Arizona State Route 64 a route from Williams to the Grand Canyon. In 1935, the highway was extended to the east from the Grand Canyon to US 89. In 1961, the highway was extended further east from US 89 through Tuba City to the New Mexico state line. In 1965, the portion from Teec Nos Pos was renumbered to SR 504 to match New Mexico, which would be renumbered again in 1987 to US 64. In 1965, the section to the east of US 89 became US 164, and would later be renumbered to US 160 in 1969. Arizona State Route 64 State Route
Arizona State Route 181 81 (now US 191) to the Chiricahua National Monument. Since then, the routing has not been changed and SR 181 remains as when it was defined. Arizona State Route 181 State Route 181 (SR 181) is a highway in Cochise County, Arizona that runs from its junction with US 191 east of Pearce to the Chiricahua National Monument. It is an east–west route for the half east of Pearce, but becomes a primarily north–south route on the half approaching the monument. SR 181 serves primarily as an access to the monument, although it also services the settlement of Sunizona east