| 1/02/55 | Licensed to St. Louis Broadcasting Co. at 1,000 watts as KATZ |
| 3/30/57 | Control transfer to Rollins Broadcasting |
| 1/19/60 | Sale to Laclede Radio approved, rescinded 2 days later |
| 2/01/60 | Control transfer to Laclede Radio |
| 1982 | Control transfer to Unity |
| 1986 | Control transfer to InterUrban Broadcasting |
| 11/27/91 | InterUrban declares bankruptcy |
| 10/92 | Control transfer to Noble Broadcasting |
| 2/96 | Control transfer to Jacor |
| 10/31/97 | Call letters changed to KMJM |
| 3/06/98 | Call letters changed back to KATZ |
| 12/31/01 | Control transfer to Clear Channel (Citicasters) |
Call Letters:
KATZ
KMJM
AM/FM:
AM