Winslow (Navajo: Béésh Sinil or Béésinil) is a city in Navajo County, Arizona, United States. According to 2005 Census Bureau estimates, the population of the city is 9,931. It was named for either Edward F. Winslow, president of St. Louis and San Francisco Rail Road, which owned one half of the old Atlantic and Pacific Railroad, or Tom Winslow, a prospector who lived in the area. The last Harvey House (the La Posada Hotel) opened in 1930. It was designed by Mary Colter.