| 3001 | WMES | WEST-METRO EXPRESS | | | SCAC4 |
| 3002 | WMFA | WIN-MAR FREIGHT MANAGEMENT INC | | | SCAC4 |
| 3003 | WMFI | WELTON MOTOR FREIGHT INC | | | SCAC4 |
| 3004 | WMFS | WIN-MAR FREIGHT SYSTEMS | | | SCAC4 |
| 3005 | WMFT | WHITE MARSH TRANSPORT INC | | | SCAC4 |
| 3006 | WMGB | WILLIAMS, G & B ENTERPRISES LTD | | | SCAC4 |
| 3007 | WMGO | WILMINGTON OIL CO INC | | | SCAC4 |
| 3008 | WMGP | WELMAR GROUP, THE | | | SCAC4 |
| 3009 | WMGT | WORLD MANAGEMENT INC | | | SCAC4 |
| 3010 | WMGU | WAXING MOON GLOBAL LIMITED | | BVI | BIC |
| 3011 | WMGX | Wentz & McCasky Gasoline Co. | 7/1923 | | NAKINA |
| 3012 | WMGX | L.H. Wentz Oil Division | 7/1930-1/1941 | | NAKINA |
| 3013 | WMGX | W.H. Schoenwald | 1/1943 | | NAKINA |
| 3014 | WMGX | L.H. Wentz (Oil Division) | Apr-38 | | NRHS |
| 3015 | WMGX | W. H. SCHOENWALD [L. H. WENTZ, OIL DIV.; WENTZ & MCCASKY GASOLINE CO.] | | | PWRC |
| 3016 | WMHA | WHITLEY MOBILE HOMES INC | | | SCAC4 |
| 3017 | WMHB | WALLACE MOBILE HOME SERVICE | | | SCAC4 |
| 3018 | WMHN | WALTON MILK HAULING INC | | | SCAC4 |
| 3019 | WMHR | WANNEMA | | | SCAC4 |
| 3020 | WMI | West Michigan R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 3021 | WMI | West Michigan R.R. Co. | Jul-00 | | NRHS |
| 3022 | WMI | WEST MICHIGAN RAILROAD CO. | | | PWRC |
| 3023 | WMI | West Michigan Railroad Co | | | RSRV |
| 3024 | WMI | WEST MICHIGAN RAILROAD CO | | | SCAC4 |
| 3025 | WMIA | WESTPIER MARINE & INDUSTRIAL SUPPLY | | | SCAC4 |
| 3026 | WMIC | WEST MICHIGAN CARTAGE INC | | | SCAC4 |
| 3027 | WMIF | WASTE MANAGEMENT INC OF FLORIDA | | | SCAC4 |
| 3028 | WMIQ | W MARINE INC | | | SCAC4 |
| 3029 | WMIX | Waste Management of Illinois, Inc. | added 10/1996; eliminated 4/2000; 7/2000-7/2005 (not listed) | | NAKINA |
| 3030 | WMIX | Waste Management of Illinois, Inc. | added 10/96; eliminated 4/2000; 7/2000 | | NRHS |
| 3031 | WMIX | WASTE MANAGEMENT OF ILLINOIS, INC. | | | PWRC |
| 3032 | WMIX | Waste Management of Illinois | | | RSRV |
| 3033 | WMIZ | WIMPEY MINERAL | | | PWRC |
| 3034 | WMJS | WMJ EXPRESS INC | | | SCAC4 |
| 3035 | WMKA | WARMKA TRANSPORT INC | | | SCAC4 |
| 3036 | WMKC | WM TRUCKING LLC | | | SCAC4 |
| 3037 | WMKG | WILLIAMS TRUCKING | | | SCAC4 |
| 3038 | WMKL | WILLIAMS TRUCKING LLC | | | SCAC4 |
| 3039 | WMKN | WILLIAMS TRUCKING LC | | | SCAC4 |
| 3040 | WMKR | W M TRUCKING INC | | | SCAC4 |
| 3041 | WMKT | WACKER, MIKE TRUCKING LLC | | | SCAC4 |
| 3042 | WMKX | Whiting Milk Co. | 4/1947-7/1954; eliminated 1/1957 | | NAKINA |
| 3043 | WMKX | Whiting Milk Co. | Jan-52 | | NRHS |
| 3044 | WMKX | WHITING MILK CO. | | | PWRC |
| 3045 | WML | Chantilly Air, Inc. | Callsign: Marlin, | USA | AVCODES |
| 3046 | WML | Chantilly Air | | | ICAO1 |
| 3047 | WMLB | WILLIAMSON, MICHAEL L LLC | | | SCAC4 |
| 3048 | WMLD | WELSH MINERS LAMP | | | SCAC4 |
| 3049 | WMLE | WHITES MANUFACTURING LTD | | | SCAC4 |
| 3050 | WMLG | WISE MOVERS LLC | | | SCAC4 |
| 3051 | WMLR | WE MART LLC | | | SCAC4 |
| 3052 | WMLT | WILLIAMS, LARRY TRUCKING LLC | | | SCAC4 |
| 3053 | WMLU | WESTERMAN MULTIMODAL | | NL | BIC |
| 3054 | WMMD | WERNER ENTERPRISES INC (MMD DIVISIO | | | SCAC4 |
| 3055 | WMME | WILLIAMS, MICHAEL J | | | SCAC4 |
| 3056 | WMMI | WERNER ENTERPRISES INC (INTERMODAL | | | SCAC4 |
| 3057 | WMMT | WHITE MARSH MACHINERY TRANSPORT LLC | | | SCAC4 |
| 3058 | WMN | Trident Aircraft, Inc. | Callsign: Waterman, | USA | AVCODES |
| 3059 | WMN | Wagon Management SRL | | RO | VKM |
| 3060 | WMNG | WEBB MOVING & STORAGE | | | SCAC4 |
| 3061 | WMNO | WORKMAN OIL COMPANY | | | SCAC4 |
| 3062 | WMNR | WINDY MEADOW NURSERY | | | SCAC4 |
| 3063 | WMOC | WASTE MANAGEMENT OF CANADA CORPORAT | | | SCAC4 |
| 3064 | WMOD | WASTE MANAGEMENT OF MD | | | SCAC4 |
| 3065 | WMOE | WIEGANDBUTTON MOTOR EXPRESS | | | SCAC1 |
| 3066 | WMOE | WIEGANDBUTTON MOTOR EXPRESS INC | | | SCAC4 |
| 3067 | WMOG | WAYNE MOVING AND STORAGE COMPANY | | | SCAC4 |
| 3068 | WMOL | WRIGHT-KNOX MOTOR LINES INC | | | SCAC4 |
| 3069 | WMOM | WILLIAMS OIL CO INC | | | SCAC4 |
| 3070 | WMON | WOMCO TRUCKING | | | SCAC4 |
| 3071 | WMOO | WILLIAMS OIL CO | | | SCAC4 |
| 3072 | WMOT | WHITMORE TRUCKING | | | SCAC4 |
| 3073 | WMPI | WORKMAN PROPERTIES INC | | | SCAC4 |
| 3074 | WMPL | WELLMASTER PIPE & SUPPLY INC | | | SCAC4 |
| 3075 | WMPR | WE M PACT TRUCKING | | | SCAC4 |
| 3076 | WMPT | WILLIAMS-PITTS OIL CO INC | | | SCAC4 |
| 3077 | WMPTE | West Midlands Passenger Transport Executive | City: Birmingham | GB | TRAFFIC |
| 3078 | WMR | Western Maryland Railway | Real: WM | USA | TRAFFIC |
| 3079 | WMRN | WILMAR & CO | | | SCAC4 |
| 3080 | WMRR | WILLIAMS, RICK ENTERPRISES INC | | | SCAC4 |
| 3081 | WMRS | WILLIAMS, CARLOS | | | SCAC4 |
| 3082 | WMRX | Merchants Despatch Transportation Corp. | added 4/1956; 10/1957-10/1966; eliminated 10/1969 | | NAKINA |
| 3083 | WMRX | Merchants Despatch Transportation Corp. | 10/57-10/66; eliminated 10/69 | | NRHS |
| 3084 | WMRX | MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 3085 | WMS | WHITE MOUNTAIN SCENIC RAILROAD | | | PWRC |
| 3086 | WMSA | WHERLEY MOVING SYSTEMS INC | | | SCAC4 |
| 3087 | WMSB | WILLIAMS TRUCK BROKERS | | | SCAC4 |
| 3088 | WMSC | White Mountain Scenic R.R. | 1/1980-7/2005 | | NAKINA |
| 3089 | WMSC | White Mountain Scenic R.R. | 1/80-7/2000 | | NRHS |
| 3090 | WMSC | WHITE MOUNTAIN SCENIC RAILROAD | | | PWRC |
| 3091 | WMSC | White Mountain Scenic Railroad | | | RSRV |
| 3092 | WMSD | WILLIAMS MOVING & STORAGE (BC) LTD | | | SCAC4 |
| 3093 | WMSH | WASHINGTON MARITIME SHIPPING CORP | | | SCAC4 |
| 3094 | WMSL | WOOD-MILLER SAW & KNIFE LIMITED | | | SCAC4 |
| 3095 | WMSM | WHITES MOVING SYSTEMS INC | | | SCAC4 |
| 3096 | WMSN | WILLIAMS SYSTEMS LLC | | | SCAC4 |
| 3097 | WMSQ | WILTFONG MOVING & STORAGE INC | | | SCAC4 |
| 3098 | WMSR | WESTERN MARYLAND SCENIC RAILROAD | | | PWRC |
| 3099 | WMSR | Western Maryland Scenic Railroad | | | RSRV |
| 3100 | WMSR | Western Maryland Scenic Railroad | | USA | TRAFFIC |
