| 1 | MWB | Mittelweserbahn GmbH | Bruchhausen-Vilsen | D | privat-bahn.de |
| 2 | MWB | Mittelweserbahn | | D | TRAFFIC |
| 3 | MWB | Mittelweserbahn | | DE | VKM |
| 4 | MWBC | MCCARTNEY | | | SCAC4 |
| 5 | MWBI | MANIONS WHOLESALE BUILDING SUPPLIES | | | SCAC4 |
| 6 | MWBK | MIDWES | | | SCAC4 |
| 7 | MWBL | M W BULK LLC | | | SCAC4 |
| 8 | MWBRI | Montawerke Brixlegg | | AT | VKM |
| 9 | MWBT | MICHAELS WHOLESALE BAIT INC | | | SCAC4 |
| 10 | MWBX | Midwest By-Products Co., a Division of Gilco, Inc. | added 7/1987; 1/1994; eliminated 10/1995 | | NAKINA |
| 11 | MWBX | Midwest By-Products Co. | added 7/1974; 1/1975-1/1980; eliminated 7/1987 | | NAKINA |
| 12 | MWBX | Midwest By-Products Co. | added 7/74; 1/75-1/80; eliminated 7/87 | | NRHS |
| 13 | MWBX | Midwest By-Products Co., a Division of Gilco, Inc. | added 7/87; 1/94; eliminated 10/95 | | NRHS |
| 14 | MWBX | MIDWEST BY-PRODUCTS CO., A DIVISION OF GILCO, INC. | | | PWRC |
| 15 | MWBX | Midwest By-Products | | | RSRV |
