| 1 | ACB | African Cargo Services Limited | Callsign: Africargo, | EAK | AVCODES |
| 2 | ACB | Air Business Contact A.B.C. | Callsign: Air Contact, | F | AVCODES |
| 3 | ACB | Air Continental Africa | Callsign: Airconti, | G | AVCODES |
| 4 | ACB | Achenseebahn | | A | TRAFFIC |
| 5 | ACBA | ARABI CAB CO INC | | | SCAC3 |
| 6 | ACBB | ADAM CAB INC | | | SCAC3 |
| 7 | ACBB | A & C TRANSPORT | | | SCAC4 |
| 8 | ACBC | ABLE CHARTER BUS COMPANY | | | SCAC3 |
| 9 | ACBC | A&C Bus Corp | | USA | TRAFFIC |
| 10 | ACBF | AR TRANSPORT | | | SCAC3 |
| 11 | ACBJ | AIM CARIBBEAN EXPRESS | | | SCAC3 |
| 12 | ACBK | ACADIA TRUCKING & BROKERAGE LTD | | | SCAC3 |
| 13 | ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | 1/1975-7/2005 | | NAKINA |
| 14 | ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | 1/75-1/80 | | NRHS |
| 15 | ACBL | American Commercial Barge Lines, Inc. | Jan-94 | | NRHS |
| 16 | ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | Jul-00 | | NRHS |
| 17 | ACBL | AMERICAN COMMERCIAL BARGE LINES, INC. | | | PWRC |
| 18 | ACBL | American Commercial Barge Lines | | | RSRV |
| 19 | ACBL | AMERICAN COMMERICAL BARGE LINE COMP | | | SCAC3 |
| 20 | ACBL | ATLANTIC CARIBBEAN LINE INC | | | SCAC4 |
| 21 | ACBM | ATLANTIC COAST TRANSPORTATION INC | | | SCAC3 |
| 22 | ACBM | AUTOTRANSPORTES DE CARGA BALSA S A | | | SCAC4 |
| 23 | ACBN | ACTION BONDED MESSENGER & DELIVERY | | | SCAC3 |
| 24 | ACBN | ACTION TRANSPORT INC | | | SCAC4 |
| 25 | ACBO | ACCO BABCOCK INC | | | SCAC3 |
| 26 | ACBP | AC-BERWICK TRUCKING CORPORATION | | | SCAC3 |
| 27 | ACBP | APPLIED RESEARCH ASSOCIATES INC | | | SCAC4 |
| 28 | ACBP | AC Busreisen Potsdam GmbH | | D | TRAFFIC |
| 29 | ACBQ | AMERICAN CARIBBEAN TRUCKING CO INC | | | SCAC4 |
| 30 | ACBR | ACME BARREL COMPANY INC | | | SCAC3 |
| 31 | ACBR | A C TRUCKING | | | SCAC4 |
| 32 | ACBT | ATLANTIC COUNTY BOARD OF TRANSPORTATION | | | PWRC |
| 33 | ACBT | AUTO CLUB OF BUTLER COUNTY | | | SCAC3 |
| 34 | ACBU | ACB CONTAINERS NV | | B | BIC |
| 35 | ACBU | ALCOBRE S A | | | SCAC4 |
| 36 | ACBW | ASCHENBRENNER TRUCKING INC | | | SCAC4 |
| 37 | ACBX | Scandanavian Oil Co., Inc. | added 4/1974; 1/1975-1/1985; eliminated 10/1988 | | NAKINA |
| 38 | ACBX | Scandanavian Oil Co., Inc. | added 4/74; 1/75-1/80; eliminated 10/88 | | NRHS |
| 39 | ACBX | SCANDINAVIAN OIL CO. | | | PWRC |
| 40 | ACBX | American Cast Iron Pipe | | | RSRV |
| 41 | ACBY | A & C BUS CORP | | | SCAC3 |
| 42 | ACBY | ABC VAN LINES INC | | | SCAC4 |
