| Carrier Code | Carrier Name |
| WLNU | WILHELMSEN LINES LTD |
| WLNY | WILMINGTON SHIPPING COMPANY |
| WLQD | WONSILD LIQUID CARRIERS LTD |
| WMHU | WASTE MANAGEMENT OF SEATTLE |
| WMRI | WILLIAMS MARINE SERVICES |
| WMRM | WESTMINISTER MARINE INC |
| WMSU | WALLENIUS LINES |
| WMXU | WASHINGTON WASTE SYSTEMS INC |
| WNGN | WARRIOR & GULF NAVIGATION COMPANY |
| WNSS | WALTON & SONS STEVEDORING AND CONTRACTING CO |
| WNYU | WASTE MANAGEMENT OF NEW YORK CITY LP |
| WOCB | WORLD OCEAN (BERMUDA) LTD |
| WOCE | WESTERN OCEAN SHIPPING & TRADING INC |
| WOGU | WOLFSGRUBER TRANSPORTE GMBH |
| WOHC | WOOD-HOPKINS CONTRACTING COMPANY |
