| 8801 | CLCI | CLINTON CARTAGE INC | | | SCAC3 |
| 8802 | CLCJ | CLAYCON TRANSPORTS CORPORATION | | | SCAC3 |
| 8803 | CLCL | CLIPPER CARLOADING CO | | | PWRC |
| 8804 | CLCL | CLIPPER CARLOADING COMPANY | | | SCAC3 |
| 8805 | CLCN | CLARK COUNTY WHOLESALE INC | | | SCAC3 |
| 8806 | CLCN | CLIENT CONNECTION INC | | | SCAC4 |
| 8807 | CLCO | Claremont and Concord Ry. Co., Inc. | 7/1965-10/1966 & 1/1975-1/1980; eliminated 1/1989 | | NAKINA |
| 8808 | CLCO | Claremont and Concord Ry. Co., Inc. | 7/65-10/66 & 1/75-1/80; eliminated 1/89 | | NRHS |
| 8809 | CLCO | CLAREMONT & CONCORD RAILWAY | | | PWRC |
| 8810 | CLCO | Claremont and Concord Railway | | | RSRV |
| 8811 | CLCO | CLINCH CO INC | | | SCAC4 |
| 8812 | CLCO | Classi Coach | | USA | TRAFFIC |
| 8813 | CLCQ | CAROLINA MIRROR CORPORATION | | | SCAC3 |
| 8814 | CLCQ | CHAPMAN/LEONARD STUDIO EQUIPMENT IN | | | SCAC4 |
| 8815 | CLCR | CONTINENTAL LEASING CORPORATION | | | SCAC3 |
| 8816 | CLCR | CONSOLIDATED LOGISTICS CENTER | | | SCAC4 |
| 8817 | CLCS | CLASSIC CARTAGE | | | SCAC3 |
| 8818 | CLCS | CLINE COACHES | | | SCAC4 |
| 8819 | CLCT | CRI LOGISTICS LLC | | | SCAC4 |
| 8820 | CLCU | CARU PRAHA S.R.O | | CZ | BIC |
| 8821 | CLCU | NORTH AFRICA SHIPPING CO., LTD | | | SCAC3 |
| 8822 | CLCU | CATU PRAHA S R O | | | SCAC4 |
| 8823 | CLCV | CLAUSEN CONSTRUCTION INC | | | SCAC3 |
| 8824 | CLCV | CLT CONTRACTING | | | SCAC4 |
| 8825 | CLCW | CLEAR LAKE TRUCK & CRANE INC | | | SCAC3 |
| 8826 | CLCX | Chattahoochie Locomotive Co., Inc. | 7/2005 (not listed) | | NAKINA |
| 8827 | CLCX | Unocal Petroleum Products & Chemicals Division, Union Oil Co. of California | added 7/1994 | | NAKINA |
| 8828 | CLCX | Unocal Chemicals Division, Union Oil Co. of California | added 1/1987; 1/1994; eliminated 7/1994 | | NAKINA |
| 8829 | CLCX | Union Chemicals Division, Union Oil Co. of California | added 7/1978; 1/1980; eliminated 1/1987 | | NAKINA |
| 8830 | CLCX | Collier Carbon and Chemical Corp. | added 10/1966; 10/1966-1/1975; eliminated 7/1978 | | NAKINA |
| 8831 | CLCX | Cornwell Chemical Corp. | 1/1952-7/1954; eliminated 10/1954 | | NAKINA |
| 8832 | CLCX | General American Transportation Corp. | 1/1945-1/1946 | | NAKINA |
| 8833 | CLCX | Commercial Molasses Corp. | 7/1937-1/1943 | | NAKINA |
| 8834 | CLCX | Commercial Car Line | 8/1920-7/1935 | | NAKINA |
| 8835 | CLCX | Commercial Molasses Corp. | Apr-38 | | NRHS |
| 8836 | CLCX | Cornwell Chemical Corp. | Jan-52 | | NRHS |
| 8837 | CLCX | Collier Carbon and Chemical Corp. | added 10/66; 10/66-1/75; eliminated 7/78 | | NRHS |
| 8838 | CLCX | Union Chemicals Division, Union Oil Co. of California | added 7/78; 1/80; eliminated 1/87 | | NRHS |
| 8839 | CLCX | Unocal Chemicals Division, Union Oil Co. of California | added 1/87; 1/94; eliminated 7/94 | | NRHS |
| 8840 | CLCX | Unocal Petroleum Products & Chemicals Division, Union Oil Co. of California | added 7/94 | | NRHS |
| 8841 | CLCX | *COMMERCIAL CAR LINE | | | PWRC |
| 8842 | CLCX | *COMMERCIAL MOLASSES CORP. | | | PWRC |
| 8843 | CLCX | *GENERAL AMERICAN TRANSPORTATION CORP. | | | PWRC |
| 8844 | CLCX | *CHATAHOOCHEE LOCOMOTIVE COMPANY | | | PWRC |
| 8845 | CLCX | *UNOCAL CHEMICALS DIVISION, UNION OIL CO. OF CALIF. [COLLIER CARBON & CHEMICAL GROUP] | | | PWRC |
| 8846 | CLCX | +CLCX, INC. | | | PWRC |
| 8847 | CLCX | Chatahoochee Locomotive | | | RSRV |
| 8848 | CLCX | CHATTAHOOCHEE LOCOMOTIVE COMPANY IN | | | SCAC4 |
| 8849 | CLCZ | *COMPLETE LOGISTICS COMPANY | | | PWRC |
| 8850 | CLCZ | *COSGROVE LEAD CO. | | | PWRC |
| 8851 | CLCZ | Complete Logistics | | | RSRV |
| 8852 | CLCZ | COMPLETE LOGISTICS COMPANY | | | SCAC4 |
| 8853 | CLD | Clowes Estates Ltd. | Callsign: Clowes, | GB | AVCODES |
| 8854 | CLD | Consolidated Airways, Inc. | Callsign: Consolidated, | USA | AVCODES |
| 8855 | CLD | Clowes Estates Limited | | | ICAO1 |
| 8856 | CLDA | COLETTAS DOWNTOWN AUTO SERVICE INC | | | SCAC3 |
| 8857 | CLDB | CALIFORNIA DISTRIBUTION CENTERS, INC | | | SCAC3 |
| 8858 | CLDB | CALIFORNIA DISTRIBUTION CENTERS INC | | | SCAC4 |
| 8859 | CLDC | CLEVELAND CORP | | | SCAC3 |
| 8860 | CLDC | CANTERA & LIMESTONE DESIGN LLC | | | SCAC4 |
| 8861 | CLDD | CONSOLIDATED CARGO CORP | | | SCAC3 |
| 8862 | CLDD | CHINOOK STALLS | | | SCAC4 |
| 8863 | CLDE | CALIFORNIA DRAYAGE EXPRESS | | | SCAC3 |
| 8864 | CLDE | CLAIDEN XPRESS | | | SCAC4 |
| 8865 | CLDF | COASTAL CARRIERS LTD OF EAGAN MN | | | SCAC3 |
| 8866 | CLDF | COLD SPRINGS FARM | | | SCAC4 |
| 8867 | CLDG | COOLIDGE MOVERS, INC | | | SCAC3 |
| 8868 | CLDI | CLINARD, DAVE TRUCK SERVICE INC | | | SCAC3 |
| 8869 | CLDI | COUNTY LINE TRANSPORT CORP | | | SCAC4 |
| 8870 | CLDJ | CLOUSE, DORRIS | | | SCAC3 |
| 8871 | CLDK | COLDRICK TRUCKING CO | | | SCAC3 |
| 8872 | CLDL | COLDIRON LINES INC | | | SCAC3 |
| 8873 | CLDL | COAST-TO-COAST LOGISTICS | | | SCAC4 |
| 8874 | CLDM | CARROLL, DWAYNE M | | | SCAC3 |
| 8875 | CLDN | CLUCK, DENNIS C | | | SCAC3 |
| 8876 | CLDO | CLOUD OIL SERVICE INC | | | SCAC3 |
| 8877 | CLDO | CRYSTAL LAKES DEVELOPMENT LIMITED L | | | SCAC4 |
| 8878 | CLDP | C L D TRANSPORTATION CO INC | | | SCAC3 |
| 8879 | CLDP | CLD PACIFIC GRAIN LLC | | | SCAC4 |
| 8880 | CLDQ | CLIFF DELIVERY SERVICE | | | SCAC3 |
| 8881 | CLDQ | COLONIAL OIL INDUSTRIES INC | | | SCAC4 |
| 8882 | CLDR | CHILDERS, W D TRAVEL AGENCY INC | | | SCAC3 |
| 8883 | CLDS | CALIFORNIA DISTRIBUTUION, Culver Distribution, INC | | | SCAC3 |
| 8884 | CLDU | CLDN CARGO NV | | B | BIC |
| 8885 | CLDU | COSTA LINE CARGO SERVICES, INC. | | | SCAC3 |
| 8886 | CLDU | COBELFRET CONTAINERS NV | | | SCAC4 |
| 8887 | CLDW | COLDMAR LINES | | | SCAC3 |
| 8888 | CLDX | CAFE LAFAYETTE DINNER TRAIN | | | SCAC4 |
| 8889 | CLDY | CLACKS DELIVERY | | | SCAC3 |
| 8890 | CLDZ | *CELADON TRUCKING SERVICES | | | PWRC |
| 8891 | CLDZ | *CONSOL LAND DEVELOPMENT CO. | | | PWRC |
| 8892 | CLDZ | Celadon Trucking Services | | | RSRV |
| 8893 | CLDZ | CELADON TRUCKING SERVICES INC | | | SCAC4 |
| 8894 | CLE | Chileinter Airlines | Callsign: Chileinter, | RCH | AVCODES |
| 8895 | CLE | Colemill Enterprises | Callsign: Colemill, | USA | AVCODES |
| 8896 | CLE | Colemill Enterprises | | | ICAO1 |
| 8897 | CLE | The Cincinnati and Lake Erie Railroad | Real: C&LE | USA | TRAFFIC |
| 8898 | CLEA | CHEMICAL LEAMAN TANK LINES, INC | | | SCAC3 |
| 8899 | CLEC | CLEMMER MOVING & STORAGE INC | | | SCAC3 |
| 8900 | CLEC | CLEMMER MOVING & STORAGE INC | | | SCAC4 |
