 Until 1933, SR 84 was part of State Route 39.It became State Route 271 in the 1933 renumbering, and in the 1940 renumbering it was renumbered State Route 84 to match West Virginia Route 84.Although SR 39 was defined (as SR 9) in 1918, its location west of Monterey was not finalized to follow the present SR 84 until 1923.