| 1 | NMCA | NORTHLAND MAINTENANCE COMPANY | | | SCAC4 |
| 2 | NMCC | NISSAN MOTOR CAR CARRIER CO LTD | | | SCAC3 |
| 3 | NMCC | NISSAN MOTOR CAR CARRIER CO | | | SCAC4 |
| 4 | NMCG | NMC LOGISITICS INTERNATIONAL INC | | | SCAC4 |
| 5 | NMCH | NATIONAL MOTOR COACH | | | SCAC3 |
| 6 | NMCH | NATIONAL TRANSPORTATION COMPANY INC | | | SCAC4 |
| 7 | NMCL | NMC LOGISTICS INTERNATIONAL CO LTD | | | SCAC4 |
| 8 | NMCO | NEW MARINE CONSOLIDATION CO LTD | | | SCAC4 |
| 9 | NMCW | NIEVES MARITIME CORP | | | SCAC4 |
| 10 | NMCX | National Machinery Co. | added 4/1976; 1/1980-1/1994; eliminated 10/1998; 7/2000 (not listed) | | NAKINA |
| 11 | NMCX | Merchants Despatch Transportation Corp. | added 7/1962; 7/1965-10/1966; eliminated 4/1967; 4/1970 | | NAKINA |
| 12 | NMCX | Northern Refrigerator Line, Inc. | added 10/1955; 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 13 | NMCX | Northern Refrigerator Line, Inc. | 10/57-4/61 | | NRHS |
| 14 | NMCX | Merchants Despatch Transportation Corp. | 7/65-10/66; eliminated 4/67; 4/70 | | NRHS |
| 15 | NMCX | National Machinery Co. | added 4/76; 1/80-1/94; eliminated 10/98; 7/2000 | | NRHS |
| 16 | NMCX | NATIONAL MACHINERY COMPANY (MERCHANTS DESPATCH TRANSPORTATION CORP.[NORTHERN REFRIGERATOR LINE INC.]) | | | PWRC |
| 17 | NMCX | National Machinery | | | RSRV |
| 18 | NMCZ | NORTHSHORE MINING CO. | | | PWRC |