| 1 | WCD | Kyungwoon University | Callsign: White Cloud, | ROK | AVCODES |
| 2 | WCDA | WEST COAST DRIVERS INC | | | SCAC4 |
| 3 | WCDB | WEST COAST DISTRIBUTING INC | | | SCAC4 |
| 4 | WCDC | WISENBAKER CONSTRUCTION COMPANY INC | | | SCAC4 |
| 5 | WCDOT | Westchester County DOT | | USA | TRAFFIC |
| 6 | WCDP | WESCON CEDAR PRODUCTS LTD | | | SCAC4 |
| 7 | WCDT | WEIRD CITY TRUCKING | | | SCAC4 |
| 8 | WCDX | Westcentral Cooperative Grain Co. | added 1/1966; 10/1966; eliminated 10/1968 | | NAKINA |
| 9 | WCDX | Far-Mar-Co., Inc. | added 10/1968; 4/1970-1/1980; eliminated 10/1985 | | NAKINA |
| 10 | WCDX | Farmland Industries, Inc. | 1/1994-7/2000; eliminated 4/2005 | | NAKINA |
| 11 | WCDX | Westcentral Cooperative Grain Co. | added 1/66; 10/66; eliminated 10/68 | | NRHS |
| 12 | WCDX | Far-Mar-Co., Inc. | added 10/68; 4/70-1/80 | | NRHS |
| 13 | WCDX | Farmland Industries, Inc. | 1/94-7/2000 | | NRHS |
| 14 | WCDX | *FARMLAND INDUSTRIES, INC. [FAR-MAR-CO, INC.; WESTCENTRAL COOPERATIVE GRAIN CO.] | | | PWRC |
| 15 | WCDX | *WINE COUNTRY DINNER TRAIN | | | PWRC |
| 16 | WCDX | Westcentral Cooperative Grain (Far-Mar-Co) | | | RSRV |
| 17 | WCDY | WEST COAST DRAYAGE INC | | | SCAC4 |
