US Highway 231 - Everything2.com

US Highway 231 - Everything2.com US Highway 231 was one of the original United States federal highways commissioned by the American Association of State Highway Officials (AASHO, now AASHTO) in November, 1926. Its original routing, as laid out in the Joint Board on Interstate Highways plan of 1925, was from Montgomery, Alabama to Marianna, Florida. The highway was given the number "231" since it was to be the second branch of US Highway 31 (US Highway 131 was already in existence in Michiga...