 KTVX is the oldest television station located in the Mountain Time Zone and the third oldest station located west of the Mississippi River.It was also the first independently owned television station to sign-on in the United States.The station changed its call letters to KTVT in 1953 (the KTVT call letters are now used on the CBS owned-and-operated station in Dallas–Fort Worth), For a brief period during the mid-1950s, it was owned by Time-Life Inc.

Its call letters later changed to KCPX-TV in 1959, following its sale to Screen Gems Broadcasting (a division of Screen Gems, then the television division of Columbia Pictures).