 SR 333 is not part of the National Highway System, a system of roadways important to the nation's economy, defense, and mobility.The roadway that would eventually become SR 333 was established at least as far back as 1919 as part of SR 35 along SR 333's current path.By the end of 1921, SR 35 between Quitman and SR 333's northern terminus was rerouted to a more southern path.