In 1959, the portion of OK 15 between Texas and Kansas was renamed OK 23 conforming with the connecting Kansas highway. On January 25, 1959, TxDOT began signing FM 1265 as SH 23, although the road officially retained the FM 1265 designation. RM 3260 was branched off in 1972 and completed in 1978 connecting the highway to Lipscomb. On August 29, 1990, the highway was officially designated SH 23, and FM 1265 was decommissioned.
