Oklahoma State Highway 270 1979, US-270 ran through Oklahoma City on surface streets. It left the city and ran through Choctaw concurrent with US-62. US-270 split away from US-62 in Harrah, and continued on to Shawnee on what is now SH-270. On March 5, 1979, US-270 was rerouted to run concurrent with Interstate 40 from south of Calumet in Canadian County through the Oklahoma City metro, exiting the Interstate onto a surface alignment in Shawnee. Presumably, SH-270 was commissioned the same date. The realignment of US-270, with SH-270 on the old alignment between Harrah and Shawnee, appears on the 1979 state map. SH-270 followed
Oklahoma State Highway 132 (1.6 km) to the west of unincorporated Hawley. Its final highway junction in Oklahoma is with State Highway 11. From here, the highway continues due north, passing west of Sand Creek, Wakita, and Gibbon en route to Manchester. After passing through Manchester, the highway turns west along the Oklahoma–Kansas state line. The road then curves back to the north, fully entering the state of Kansas, and becomes K-179. SH-132 was first designated on July 14, 1956. Initially, the highway began at what was then SH-38 (present-day SH-45) in Carrier, proceeding north along its present-day route to end at US-64 east