SR 273 was designated in 1955 from SR 73 (this section now part of SR 260) southeast and northeast to SR 73, with a spur southeast. On August 16, 1991, the section from the spur northeast was renumbered as SR 261.
SR 273 was designated in 1955 from SR 73 (now part of SR 260) southeast and northeast to SR 73. On August 16, 1991, the section from the branch southeast was renumbered as SR 261.