| 1 | WMS | WHITE MOUNTAIN SCENIC RAILROAD | | | PWRC |
| 2 | WMSA | WHERLEY MOVING SYSTEMS INC | | | SCAC4 |
| 3 | WMSB | WILLIAMS TRUCK BROKERS | | | SCAC4 |
| 4 | WMSC | White Mountain Scenic R.R. | 1/1980-7/2005 | | NAKINA |
| 5 | WMSC | White Mountain Scenic R.R. | 1/80-7/2000 | | NRHS |
| 6 | WMSC | WHITE MOUNTAIN SCENIC RAILROAD | | | PWRC |
| 7 | WMSC | White Mountain Scenic Railroad | | | RSRV |
| 8 | WMSD | WILLIAMS MOVING & STORAGE (BC) LTD | | | SCAC4 |
| 9 | WMSH | WASHINGTON MARITIME SHIPPING CORP | | | SCAC4 |
| 10 | WMSL | WOOD-MILLER SAW & KNIFE LIMITED | | | SCAC4 |
| 11 | WMSM | WHITES MOVING SYSTEMS INC | | | SCAC4 |
| 12 | WMSN | WILLIAMS SYSTEMS LLC | | | SCAC4 |
| 13 | WMSQ | WILTFONG MOVING & STORAGE INC | | | SCAC4 |
| 14 | WMSR | WESTERN MARYLAND SCENIC RAILROAD | | | PWRC |
| 15 | WMSR | Western Maryland Scenic Railroad | | | RSRV |
| 16 | WMSR | Western Maryland Scenic Railroad | | USA | TRAFFIC |
| 17 | WMSS | WAYNE MOVING & STORAGE INC | | | SCAC4 |
| 18 | WMSU | WALLENIUS LINES | | | SCAC1 |
| 19 | WMSU | WALLENIUS LINES | | | SCAC4 |
| 20 | WMSV | WAINWRIGHT MARINE SERVICES LTD | | | SCAC4 |
| 21 | WMSZ | Schneider & Schneider GmbH | | DE | VKM |
