Benson is a city in Cochise County, Arizona, in the United States, 45 miles east-southeast of Tucson. It was founded as a rail terminal for the area, and still serves as such. According to 2006 Census Bureau estimates, the population of the city is 4,934. The city was founded in 1880 when the Southern Pacific Railroad came through. It was named after Judge William B. Benson, a friend of Charles Crocker, president of the Southern Pacific Railroad.