| 801 | KCHG | KOCH, GARY TRUCKING INC | | | SCAC4 |
| 802 | KCHI | KIRSCH TRUCKING LLC | | | SCAC4 |
| 803 | KCHK | KCH TRUCKING LLC | | | SCAC4 |
| 804 | KCHL | K C HAULERS INC | | | SCAC3 |
| 805 | KCHM | KETCHAM TRUCKING INC | | | SCAC3 |
| 806 | KCHM | KOCH MARITIME INC | | | SCAC4 |
| 807 | KCHP | KINSEL, CHUCK TRUCKING & EXCAVATING | | | SCAC3 |
| 808 | KCHQ | KARCHNER, RUSSELL TRUCKING INC | | | SCAC3 |
| 809 | KCHR | KOCH TRUCKING | | | SCAC4 |
| 810 | KCHS | KNIGHT CHARTER SERVICE | | | SCAC3 |
| 811 | KCHT | KOCH TRANSPORT LTD | | | SCAC3 |
| 812 | KCHZ | KERLEY CHEMICAL | | | PWRC |
| 813 | KCI | Aeromech Commuter Airlines | Callsign: Aeromech, | USA | AVCODES |
| 814 | KCI | KRAPFS COACHES INC | | | SCAC4 |
| 815 | KCIA | K C I AIRPORT EXPRESS | | | SCAC3 |
| 816 | KCIA | KERSHAW CONTRACTING INC | | | SCAC4 |
| 817 | KCIB | KCI CUSTOMS BROKERS INC | | | SCAC4 |
| 818 | KCIE | KRICK CARRIERS INC | | | SCAC4 |
| 819 | KCIH | KEARNEY COMPANIES INC, THE | | | SCAC4 |
| 820 | KCII | KC INTERNATIONAL INC. | | | SCAC3 |
| 821 | KCII | KC INTERNATIONAL INC. | | | SCAC4 |
| 822 | KCIM | KEY CITY MOVING AND STORAGE | | | SCAC3 |
| 823 | KCIN | KCI INC | | | SCAC3 |
| 824 | KCIN | KEY CURBING INC | | | SCAC4 |
| 825 | KCIO | KUNZLER & CO INC | | | SCAC4 |
| 826 | KCIQ | KL-CHEMPAK INC | | | SCAC4 |
| 827 | KCIR | KCI ROADRUNNER | | | SCAC3 |
| 828 | KCIR | KCI ROADRUNNER | | | SCAC4 |
| 829 | KCIS | KIMBERLY-CLARK INTERGRATED SERVICES | | | SCAC3 |
| 830 | KCIT | KC INDUSTRIES TRUCKING LLC | | | SCAC4 |
| 831 | KCIU | KING CHEONG LOGISTICS LIMITED | | | SCAC4 |
| 832 | KCIX | Nova Chemicals Inc. | added 4/1997; eliminated 7/2000; 7/2000 (not listed) | | NAKINA |
| 833 | KCIX | ARCO Chemical Co. | added 10/1982; 1/1994; eliminated 4/1997 | | NAKINA |
| 834 | KCIX | ARCO Polymers, Inc. | added 10/1979; 1/1980; eliminated 10/1982 | | NAKINA |
| 835 | KCIX | ARCO/Polymers, Inc. | added 10/1974; 1/1975; eliminated 10/1979 | | NAKINA |
| 836 | KCIX | Arco Polymers, Inc. | added 1/1974; eliminated 10/1974 | | NAKINA |
| 837 | KCIX | Sinclair-Koppers Co. | added 4/1966; 10/1966-4/1970; eliminated 1/1974 | | NAKINA |
| 838 | KCIX | Koppers Co., Inc. | added 1/1965; 7/1965; eliminated 4/1966 | | NAKINA |
| 839 | KCIX | Kaiser Steel Corp. | 1/1950 | | NAKINA |
| 840 | KCIX | Kaiser Co., Inc., Iron and Steel Division | 1/1945-4/1947 | | NAKINA |
| 841 | KCIX | Koppers Co., Inc. | added 1/65; 7/65; eliminated 4/66 | | NRHS |
| 842 | KCIX | Sinclair-Koppers Co. | added 4/66; 10/66-4/70 | | NRHS |
| 843 | KCIX | ARCO/Polymers, Inc. | Jan-75 | | NRHS |
| 844 | KCIX | ARCO Polymers, Inc. | 1/80; eliminated 10/82 | | NRHS |
| 845 | KCIX | ARCO Chemical Co. | added 10/82; 1/94; eliminated 4/97 | | NRHS |
| 846 | KCIX | Nova Chemicals Inc. | added 4/97; 7/2000; eliminated 7/2000 | | NRHS |
| 847 | KCIX | *KAISER STEEL CORP. | | | PWRC |
| 848 | KCIX | *SINCLAIR-KOPPERS CO. [KOPPERS CO., INC.] | | | PWRC |
| 849 | KCIX | *ARCO CHEMICAL COMPANY [ARCO POLYMERS] | | | PWRC |
| 850 | KCIX | *NOVA CHEMICALS INCORPORATED | | | PWRC |
| 851 | KCIX | ARCO Chemical (Nova Chemicals) | | | RSRV |
| 852 | KCIX | KOPPERS CO INC | | | SCAC3 |
| 853 | KCJR | KERRICK | | | SCAC4 |
| 854 | KCKA | KENTUCKIANA TRANSPORTATION INC | | | SCAC3 |
| 855 | KCKE | KECK ENTERPRISES | | | SCAC4 |
| 856 | KCKG | K C TRUCKING | | | SCAC3 |
| 857 | KCKL | KUCKUCK TRANSPORT LLC | | | SCAC4 |
| 858 | KCKT | KECK TRANSPORT | | | SCAC4 |
| 859 | KCL | Jubilee Airways Ltd. | Callsign: Losalt, ICAO callsign changed to Tartan | GB | AVCODES |
| 860 | KCL | Jubilee Airways Ltd. | Callsign: Tartan, ICAO callsign changed from Losalt | GB | AVCODES |
| 861 | KCL | KUBE CON logistics GmbH | | DE | VKM |
| 862 | KCLA | K & C LOGISTICS INC | | | SCAC4 |
| 863 | KCLD | K C LOCAL DELIVERY INC | | | SCAC3 |
| 864 | KCLD | KASE CONTAINER LINE LTD | | | SCAC4 |
| 865 | KCLG | KITCHENS, L G | | | SCAC3 |
| 866 | KCLH | KINGDOM COACH LLC | | | SCAC4 |
| 867 | KCLI | K & C LOGISTICS LLC | | | SCAC4 |
| 868 | KCLL | KINGSMEN COACH LINE LLC | | | SCAC4 |
| 869 | KCLO | K-C LOGISTICS CO | | | SCAC4 |
| 870 | KCLQ | KINSELLA, CLAUDE | | | SCAC3 |
| 871 | KCLU | JIANGSU KTK LOCOMOTIVE & ROLLING STOCK CO.,LTD | | PRC | BIC |
| 872 | KCLV | K C LIVESTOCK | | | SCAC4 |
| 873 | KCLX | Kansas City Power & Light Co. | added 4/1971; 1/1975-1/1994; eliminated 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 874 | KCLX | Kansas City Power & Light Co. | added 4/71; 1/75-1/94; eliminated 7/97; 7/2000 | | NRHS |
| 875 | KCLX | KANSAS CITY LIGHT & POWER CO. | | | PWRC |
| 876 | KCLX | Kansas City Power and Light | | | RSRV |
| 877 | KCLX | KANSAS CITY POWER & LIGHT CO. | | | SCAC4 |
| 878 | KCLX | Kansas City Power & Light Co. | | USA | TRAFFIC |
| 879 | KCM | King County Metro | City: Seattle | USA | TRAFFIC |
| 880 | KCM | KTsM PLC / КЦМ АД | | BG | VKM |
| 881 | KCMA | KISHINCHAND CHELLARAM MARITIME AGEN | | | SCAC3 |
| 882 | KCME | K C METRO EXPRESS INC | | | SCAC3 |
| 883 | KCMI | KENCAL MESSENGER SERVICE INC | | | SCAC3 |
| 884 | KCML | KOPPE, CLIFF METALS INC | | | SCAC3 |
| 885 | KCMO | Kansas City, Mexico & Orient | 1/1975-1/1980 | | NAKINA |
| 886 | KCMO | Kansas City, Mexico & Orient | 1/75-1/80 | | NRHS |
| 887 | KCMO | FERROCARRIL CHIHUAHUA AL PACIFICO [FERROCARRIL KANSAS CITY MEXICO Y ORIENTE; KANSAS CITY, MEXICO & ORIENT RAILWAY} | | | PWRC |
| 888 | KCMO | Kansas City, Mexico & Orient | | | RSRV |
| 889 | KCMR | KEY CARGO MARINE INC | | | SCAC3 |
| 890 | KCMS | KACHINA MOVING & STORAGE | | | SCAC3 |
| 891 | KCMS | KCM TRANSPORTATION L L C | | | SCAC4 |
| 892 | KCMT | K C MATT TRANSPORT INC | | | SCAC4 |
| 893 | KCMX | PLM International, Inc. | added 4/1991; 1/1994; eliminated 1/2004 | | NAKINA |
| 894 | KCMX | Saskterra Fertilizers Ltd. | added 1/1991; eliminated 4/1991 | | NAKINA |
| 895 | KCMX | Potash Corp. of Saskatchewan, Inc. | added 10/1990; eliminated 1/1991 | | NAKINA |
| 896 | KCMX | Saskterra Fertilizers Ltd. | added 7/1986; eliminated 10/1990 | | NAKINA |
| 897 | KCMX | Kidd Creek Mines, Ltd. | added 4/1982; eliminated 7/1986 | | NAKINA |
| 898 | KCMX | The Kansas Chemical Manufacturing Co. | 8/1920 | | NAKINA |
| 899 | KCMX | Kidd Creek Mines, Ltd. | added 4/82; eliminated 7/86 | | NRHS |
| 900 | KCMX | Saskterra Fertilizers Ltd. | added 7/86; eliminated 10/90 | | NRHS |
