U.S. Route 66 (US 66, Route 66) also known as the Will Rogers Highway, was a major United States Numbered Highway in the state of Arizona from November 11, 1926 to June 26, 1985. US 66 covered a total of through Arizona. The highway ran from west to east, starting in Needles, California, through Kingman and Seligman to the New Mexico state line. Nationally, US 66 ran from Santa Monica, California, to Chicago, Illinois. In its height of popularity, US 66 was one of the most popular highways in the state of Arizona, sometimes carrying over one million cars a year.