The station was first licensed, as KGCB, on August 19, 1926 to the Wallace Radio Institute in Oklahoma City.
[2] In early 1929 the station was bought by the Champlin Refining Company, which changed the call sign to KCRC.
[4] On March 17, 1997 the Federal Communications Commission (FCC) announced that eighty-eight stations had been given permission to move to newly available "Expanded Band" transmitting frequencies, ranging from 1610 to 1700 kHz, with KCRC authorized to move from 1390 to 1640 kHz.
[5] An application for the new expanded band station, also licensed to Enid, was filed in 1997, which was issued a Construction Permit the next year, and after a series of call letter changes became KZLS.
One restriction is that the FCC has generally required paired original and expanded band stations to remain under common ownership.