| 1 | WSC | Gatwick Air Taxis Ltd. | Callsign: Gatwick Air, | GB | AVCODES |
| 2 | WSC | Westair Cargo Airlines | Callsign: Westcar, | CI | AVCODES |
| 3 | WSC | WESTERN STOCKYARDS CORP. | | | PWRC |
| 4 | WSC | WASHINGTON CHARTERS | | | SCAC4 |
| 5 | WSCC | WATERMAN STEAMSHIP CORP OF CALIF. | | | PWRC |
| 6 | WSCC | WESTGATE TRANSPORTATION COMPANY | | | SCAC4 |
| 7 | WSCE | WES STOR CONTAINER & TRANSPORTATION | | | SCAC4 |
| 8 | WSCG | WISE TRUCKING | | | SCAC4 |
| 9 | WSCH | WISCHMEIE | | | SCAC4 |
| 10 | WSCI | WRIGHT STUFF COMPANY LLC, THE | | | SCAC4 |
| 11 | WSCJ | WELTON SHIPPING CO INC | | | SCAC4 |
| 12 | WSCK | WESMAR STEEL CORPORATION | | | SCAC4 |
| 13 | WSCL | WATERFRONT SHIPPING COMPANY LIMITED | | | SCAC4 |
| 14 | WSCP | WESTONE COMPANY, THE | | | SCAC4 |
| 15 | WSCQ | WCI | | | SCAC4 |
| 16 | WSCS | WILLIS CONSTRUCTION CO INC | | | SCAC4 |
| 17 | WSCU | CARU CONTAINERS BV | | NL | BIC |
| 18 | WSCU | CONTAINER ASSOCIATION ROTTERDAM BV- | | | SCAC4 |
| 19 | WSCV | WEST SERVICE CENTER INC | | | SCAC4 |
| 20 | WSCX | Willibald Schaefer Co. | 7/1937-4/1938; added 1/1968; 4/1970; eliminated 10/1972 | | NAKINA |
| 21 | WSCX | Buffalo Brake Beam Co. | added 10/1980; eliminated 5/1983; 1/1994 (not listed) | | NAKINA |
| 22 | WSCX | Consumers Energy Co. | added 4/2007 | | NAKINA |
| 23 | WSCX | Willibald Schaefer Co. | 4/38; added 1/68; 4/70; eliminated 10/72 | | NRHS |
| 24 | WSCX | Buffalo Brake Beam Co. | added 10/80; eliminated 5/83; 1/94 | | NRHS |
| 25 | WSCX | *WILLIBALD SCHAEFER CO. | | | PWRC |
| 26 | WSCX | *BUFFALO BRAKE BEAM CO. | | | PWRC |
| 27 | WSCX | +CONSUMERS ENERGY CO. | | | PWRC |
| 28 | WSCX | Willibald Schaefer (Consumers Energy) | | | RSRV |
| 29 | WSCX | CONSUMERS ENERGY COMPANY | | | SCAC4 |
| 30 | WSCZ | WESTERN SUGAR CO. | | | PWRC |
