. U.S. Route 485 was especially made in 1926, looping west of US 85 among Santa Fe as well as Raton in New Mexico. In 1931, it has become an extension for US 64.
. In 1959, the Arizona Department of Transportation has submitted a proposal to extend US 64 west starting from Santa Fe, New Mexico towards US 89 close to Tuba City as well as Arizona, which was rejected.
. The portion south of Taos has been removed in 1974, when US 64 has been realigned and extended towards Farmington, and it became NM 68.