| 1 | BSO | Aeroclub Barcelona-Sabadell | | E | AVCODES |
| 2 | BSOB | BULLFROG SPAS OF BILLINGS | | | SCAC4 |
| 3 | BSOC | BUTCH & SONS CARTAGE INC | | | SCAC3 |
| 4 | BSOD | BEAU SOLEIL | | | SCAC4 |
| 5 | BSOE | BLEDSOE, EARLE TRUCKING | | | SCAC3 |
| 6 | BSOF | BROWARD SHERIFFS OFFICE | | | SCAC4 |
| 7 | BSOH | BS TRANSPORTATION OF ILLINOIS LLC | | | SCAC4 |
| 8 | BSOI | BROWNSTONE TRANSPORTATION INC | | | SCAC3 |
| 9 | BSOI | BIG STEAM OILFIELD SERVICES | | | SCAC4 |
| 10 | BSOK | BISHOPS TRUCKING CO | | | SCAC3 |
| 11 | BSOL | BALTUS COMPANY | | | SCAC4 |
| 12 | BSOM | BLOSSMAN OIL CO INC | | | SCAC4 |
| 13 | BSON | BELL AND SONS TRUCKING COMPANY INC | | | SCAC4 |
| 14 | BSOO | BLUESTONE OIL CORPORATION | | | SCAC4 |
| 15 | BSOP | BISHOP TRUCKING COMPANY | | | SCAC3 |
| 16 | BSOQ | BANCROFT AND SONS TRANSPORTATION, INC | | | SCAC3 |
| 17 | BSOQ | BANCROFT AND SONS TRANSPORTATION IN | | | SCAC4 |
| 18 | BSOR | Buffalo Southern R.R., Inc. | added 7/1982; 1/1994-7/2000; eliminated 1/2003; 7/2005 | | NAKINA |
| 19 | BSOR | Buffalo Southern R.R., Inc. | added 7/82; 1/94-7/2000 | | NRHS |
| 20 | BSOR | BUFFALO SOUTHERN RAILROAD INC. | | | PWRC |
| 21 | BSOR | Buffalo Southern Railroad | | | RSRV |
| 22 | BSOR | BUFFALO SOUTHERN RAILROAD INC | | | SCAC3 |
| 23 | BSOR | Buffalo Southern R.R., Inc. | | USA | TRAFFIC |
| 24 | BSOS | BUTLER & SONS INC | | | SCAC3 |
| 25 | BSOT | BALISON TRUCKING INC | | | SCAC3 |
| 26 | BSOW | BOSON, B TRUCKING | | | SCAC3 |
