| 1701 | CBQ | BNSF [BURLINGTON NORTHERN RAILROAD CO.] | | | PWRC |
| 1702 | CBQ | Chicago, Burlington and Quincy Railroad (BNSF Railway) | | | RSRV |
| 1703 | CBQ | Chicago, Burlington & Quincy Railroad | | USA | TRAFFIC |
| 1704 | CBQC | COBALT TRANS INC | | | SCAC4 |
| 1705 | CBQG | C & B TRUCKING INC | | | SCAC3 |
| 1706 | CBQK | CBC TRUCKING | | | SCAC3 |
| 1707 | CBQN | C B TRUCKING | | | SCAC4 |
| 1708 | CBQO | CARPENTER, E R COMPANY | | | SCAC3 |
| 1709 | CBQP | CAST BEAVER SHIPPING COMPANY LTD. | | | SCAC3 |
| 1710 | CBQP | CAST BEAVER SHIPPING COMPANY LTD. | | | SCAC4 |
| 1711 | CBQR | CHICAGO BURLINGTON & QUINCY RAILROA | | | SCAC3 |
| 1712 | CBQS | COBALT TRANSPORT SERVICE INC | | | SCAC4 |
| 1713 | CBQT | COBRA TRANSPORTATION SERVICES INC | | | SCAC3 |
| 1714 | CBQT | COBRA TRANSPORTATION SERVICES INC | | | SCAC4 |
| 1715 | CBQZ | BNSF [BURLINGTON NORTHERN RAILROAD CO.] | | | PWRC |
| 1716 | CBQZ | Chicago, Burlington and Quincy Railroad (BNSF Railway) | | | RSRV |
| 1717 | CBR | Cabair Helicopters Ltd / CCAT | Callsign: Cabair London, Ceased operations. | GB | AVCODES |
| 1718 | CBR | Cabair Air Taxis Limited | Callsign: Cabair, | GB | AVCODES |
| 1719 | CBR | Cobra Aviation | Callsign: Strike, | ZA | AVCODES |
| 1720 | CBR | Cabair College of Air Training | | | ICAO1 |
| 1721 | CBR | *CLOVE BRANCH RAILROAD | | | PWRC |
| 1722 | CBR | *CURTIS BAY RAILROAD CO. | | | PWRC |
| 1723 | CBR | COOS BAY RAILROAD OPERATING CO LLC | | | SCAC4 |
| 1724 | CBR | CB Rail | | EU | TRAFFIC |
| 1725 | CBR | CBRail Sarl | | LU | VKM |
| 1726 | CBRA | CAMBRA TRUCKING INC | | | SCAC3 |
| 1727 | CBRB | CHAHAL BROS | | | SCAC4 |
| 1728 | CBRC | C & B RANCH | | | SCAC3 |
| 1729 | CBRD | CHAMBERLAND, R F POTATO CORP | | | SCAC3 |
| 1730 | CBRD | CHAMBERLAND, R F INC | | | SCAC4 |
| 1731 | CBRE | CARE BEAR REFRIGERATED TRANSPORT IN | | | SCAC4 |
| 1732 | CBRF | CHARBONNEAU, ROGER F TRUCKING | | | SCAC3 |
| 1733 | CBRG | CANAL BARGE CO INC | | | SCAC3 |
| 1734 | CBRG | CANAL BARGE COMPANY INC | | | SCAC4 |
| 1735 | CBRG | CBRail II GmbH | | DE | VKM |
| 1736 | CBRH | CORRIGAN BROTHERS INC | | | SCAC3 |
| 1737 | CBRH | CABRERA RINCON, LUZ MARIA | | | SCAC4 |
| 1738 | CBRI | CABRILLO MOVING SERVICE INC | | | SCAC3 |
| 1739 | CBRI | CBR TRANSPORT INC | | | SCAC4 |
| 1740 | CBRK | CARRERE BROS ROCK CO | | | SCAC3 |
| 1741 | CBRL | CROSS-BORDER LOGISTICS LLC | | | SCAC4 |
| 1742 | CBRL | CBRail Leasing Sarl | | LU | VKM |
| 1743 | CBRLG | CBRail Leasing GmbH | | LU | VKM |
| 1744 | CBRM | Chillicothe-Brunswick Rail Maintenance Authority | added 7/1994; added 7/1995; eliminated 4/1997; 7/2000-7/2005 | | NAKINA |
| 1745 | CBRM | Chillicothe-Brunswick Rail Maintenance Authority | added 7/94; added 7/95; eliminated 4/97; 7/2000 | | NRHS |
| 1746 | CBRM | CHILLICOTHE-BRUNSWICK RAIL MAINTENANCE AUTHORITY | | | PWRC |
| 1747 | CBRM | Chillicothe-Brunswick Rail Maintenance Authority | | | RSRV |
| 1748 | CBRM | CHILLICOTHE-BRUNSWIC | | | SCAC4 |
| 1749 | CBRN | CARIBBEAN REFRIGERATION & TRANSPORT | | | SCAC3 |
| 1750 | CBRN | CORBETT, BRIAN | | | SCAC4 |
| 1751 | CBRO | CAMBLE, ROBERT | | | SCAC3 |
| 1752 | CBRP | CAMBRIA TRANSPORT LTD | | | SCAC3 |
| 1753 | CBRQ | COTTON BELT HISTORICAL SOCIETY | | | PWRC |
| 1754 | CBRR | COLUMBIA RIVER TRANSFER, INC | | | SCAC3 |
| 1755 | CBRS | CLANCY BROS TRANSPORTATION | | | SCAC3 |
| 1756 | CBRS | COSIO BROTHERS | | | SCAC4 |
| 1757 | CBRS | Cargo Beamer RollingStock GmbH | | DE | VKM |
| 1758 | CBRT | CABRERA TRANSPORTATION INC | | | SCAC4 |
| 1759 | CBRU | CANBERRA CONTAINERS | | AUS | BIC |
| 1760 | CBRV | COLUMBIA RIVER SHAKE & SHINGLE LTD | | | SCAC3 |
| 1761 | CBRW | Columbia Basin R.R. Co., Inc. | added 4/1997; 7/2000-7/2005 | | NAKINA |
| 1762 | CBRW | Columbia Basin R.R. Co., Inc. | added 4/97; 7/2000 | | NRHS |
| 1763 | CBRW | COLUMBIA BASIN RAILROAD CO. | | | PWRC |
| 1764 | CBRW | Columbia Basin Railroad | | | RSRV |
| 1765 | CBRW | COLUMBIA BASIN RAILROAD COMPANY INC | | | SCAC4 |
| 1766 | CBRW | Columbia Basin R.R. Co., Inc. | | USA | TRAFFIC |
| 1767 | CBRX | Charles Barthoid | 7/2005 (not listed) | | NAKINA |
| 1768 | CBRX | The Columbiana Boiler Co. | added 4/1959; 4/1961-7/1965; eliminated 4/1966 | | NAKINA |
| 1769 | CBRX | The Columbus Packing Co. | 7/1937 | | NAKINA |
| 1770 | CBRX | Columbus Packing Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 1771 | CBRX | Capitol Brand Refrigerator Express (The Columbus Packing Co.) | 7/1930-7/1932 | | NAKINA |
| 1772 | CBRX | The Columbiana Boiler Co. | 4/61-7/65; eliminated 4/66 | | NRHS |
| 1773 | CBRX | *COLUMBUS PACKING CO [CAPITOL BRAND REFRIGERATOR EXPRESS] | | | PWRC |
| 1774 | CBRX | *COLUMBIANA BOILER CO. | | | PWRC |
| 1775 | CBRX | *CBEC RAILWAY, INC. | | | PWRC |
| 1776 | CBRX | +CHARLES BARTHOID | | | PWRC |
| 1777 | CBRX | Charles Barthoid | | | RSRV |
| 1778 | CBRX | COLUMBIANA BOILER CO | | | SCAC3 |
| 1779 | CBRX | BARTHOLD, CHARLES | | | SCAC4 |
| 1780 | CBRY | Copper Basin Ry., Inc. | added 10/1986; eliminated 7/1992; added 10/1992; 1/1994-7/2005 | | NAKINA |
| 1781 | CBRY | Copper Basin Ry., Inc. | added 10/86; eliminated 7/92; added 10/92; 1/94-7/2000 | | NRHS |
| 1782 | CBRY | COPPER BASIN RAILWAY COMPANY | | | PWRC |
| 1783 | CBRY | Copper Basin Railway | | | RSRV |
| 1784 | CBRY | COPPER BASIN RAILWAY INC | | | SCAC3 |
| 1785 | CBS | Columbus Avia | Callsign: Columbus Avia, Name changed to Air Columbus | UA | AVCODES |
| 1786 | CBS | Air Columbus | Callsign: Air Columbus, Name changed from Columbus Avia | UA | AVCODES |
| 1787 | CBS | Air Columbus | | | ICAO1 |
| 1788 | CBSA | COONEY BULK SALES LIMITED | | | SCAC4 |
| 1789 | CBSB | CARIBBEAN SHIPPING SERVICES | | | SCAC3 |
| 1790 | CBSB | CARRIBEAN SHIPPING SERVICES INC | | | SCAC4 |
| 1791 | CBSC | CAROLINA BONDED STORAGE COMPANY | | | SCAC3 |
| 1792 | CBSD | COPPER BASIN DISTRIBUTORS INC | | | SCAC3 |
| 1793 | CBSE | CARIB SERVICES | | | SCAC3 |
| 1794 | CBSE | COVER-ALL BUILDING SYSTEMS INC | | | SCAC4 |
| 1795 | CBSG | CALBEST TRUCKING | | | SCAC4 |
| 1796 | CBSH | C.B.S. TRUCKING, INC | | | SCAC3 |
| 1797 | CBSH | C B S TRUCKING INC | | | SCAC4 |
| 1798 | CBSI | CAMPBELL TRUCKING | | | SCAC3 |
| 1799 | CBSK | COB SHIPPING CANADA INC, | | | SCAC3 |
| 1800 | CBSK | CAL BROS TRUCKING INC | | | SCAC4 |
