| 1 | KCM | King County Metro | City: Seattle | USA | TRAFFIC |
| 2 | KCM | KTsM PLC / КЦМ АД | | BG | VKM |
| 3 | KCMA | KISHINCHAND CHELLARAM MARITIME AGEN | | | SCAC3 |
| 4 | KCME | K C METRO EXPRESS INC | | | SCAC3 |
| 5 | KCMI | KENCAL MESSENGER SERVICE INC | | | SCAC3 |
| 6 | KCML | KOPPE, CLIFF METALS INC | | | SCAC3 |
| 7 | KCMO | Kansas City, Mexico & Orient | 1/1975-1/1980 | | NAKINA |
| 8 | KCMO | Kansas City, Mexico & Orient | 1/75-1/80 | | NRHS |
| 9 | KCMO | FERROCARRIL CHIHUAHUA AL PACIFICO [FERROCARRIL KANSAS CITY MEXICO Y ORIENTE; KANSAS CITY, MEXICO & ORIENT RAILWAY} | | | PWRC |
| 10 | KCMO | Kansas City, Mexico & Orient | | | RSRV |
| 11 | KCMR | KEY CARGO MARINE INC | | | SCAC3 |
| 12 | KCMS | KACHINA MOVING & STORAGE | | | SCAC3 |
| 13 | KCMS | KCM TRANSPORTATION L L C | | | SCAC4 |
| 14 | KCMT | K C MATT TRANSPORT INC | | | SCAC4 |
| 15 | KCMX | PLM International, Inc. | added 4/1991; 1/1994; eliminated 1/2004 | | NAKINA |
| 16 | KCMX | Saskterra Fertilizers Ltd. | added 1/1991; eliminated 4/1991 | | NAKINA |
| 17 | KCMX | Potash Corp. of Saskatchewan, Inc. | added 10/1990; eliminated 1/1991 | | NAKINA |
| 18 | KCMX | Saskterra Fertilizers Ltd. | added 7/1986; eliminated 10/1990 | | NAKINA |
| 19 | KCMX | Kidd Creek Mines, Ltd. | added 4/1982; eliminated 7/1986 | | NAKINA |
| 20 | KCMX | The Kansas Chemical Manufacturing Co. | 8/1920 | | NAKINA |
| 21 | KCMX | Kidd Creek Mines, Ltd. | added 4/82; eliminated 7/86 | | NRHS |
| 22 | KCMX | Saskterra Fertilizers Ltd. | added 7/86; eliminated 10/90 | | NRHS |
| 23 | KCMX | Potash Corp. of Saskatchewan, Inc. | added 10/90; eliminated 1/91 | | NRHS |
| 24 | KCMX | Saskterra Fertilizers Ltd. | added 1/91; eliminated 4/91 | | NRHS |
| 25 | KCMX | PLM International, Inc. | added 4/91; 1/94 | | NRHS |
| 26 | KCMX | *KANSAS CHEMICAL MANUFACTURING CO. | | | PWRC |
| 27 | KCMX | *(PLMX) PLM INTERNATIONAL, INC. [POTASH CORP. OF SASKATCHEWAN, INC.; SASKTERRA FERTILIZERS LTD.; KIDD CREEK MINES, LTD.] | | | PWRC |
| 28 | KCMX | Kidd Creek Mines | | | RSRV |
| 29 | KCMZ | KINDALL COAL MINE | | | PWRC |
