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Present-day Highway 140 was created on April 1, 1926 as State Road 40, one of the original Arkansas state highways. On November 25, 1958, the route was renumbered to Highway 140 after the American Association of State Highway Officials (AASHTO) designated Interstate 40 in Arkansas.
The original Highway 140 was created between March 1930 and June 1931 from US 65 in Dumas westward to Garrett Bridge. This route became part of AR 54 in 1937.
^ abcSystem Information and Research Division (2014). "Arkansas Road Log Database". Arkansas State Highway and Transportation Department. Archived from the original(MDB) on August 29, 2017. Retrieved March 27, 2016.
^General Highway Map, Poinsett County, Arkansas(PDF) (Map). 1:62500. Cartography by Transportation Planning & Policy Division. Little Rock: Arkansas State Highway and Transportation Department. 2016-03-23. Retrieved 2016-07-24.
^General Highway Map, Mississippi County, Arkansas(PDF) (Map). 1:62500. Cartography by Transportation Planning & Policy Division. Little Rock: Arkansas State Highway and Transportation Department. 2016-03-23. Retrieved 2016-07-24.