| 1 | MCWX | Morton International, Inc. | added 7/1965; 7/1965-10/1966; eliminated 7/1969 | | NAKINA |
| 2 | MCWX | Morton Salt Co. | added 4/1962; eliminated 7/1965 | | NAKINA |
| 3 | MCWX | Morton Chemical Co. | added 4/1958; 4/1961; eliminated 4/1962 | | NAKINA |
| 4 | MCWX | Morton Chemical Co. | 4/61; eliminated 4/62 | | NRHS |
| 5 | MCWX | Morton Salt Co. | added 4/62; eliminated 7/65 | | NRHS |
| 6 | MCWX | Morton International, Inc. | added 7/65; 7/65-10/66; eliminated 7/69 | | NRHS |
| 7 | MCWX | MORTON INTERNATIONAL {MORTON SALT CO.; MORTON CHEMICAL CO.] | | | PWRC |
