| 1 | MCP | Marcopolo Airways | Callsign: Marcopolo, | AFG | AVCODES |
| 2 | MCP | Marcopolo Airways | | | ICAO1 |
| 3 | MCPA | MANATEE COUNTY PORT AUTHORITY | | | PWRC |
| 4 | MCPA | MCCLURE TRANSPORT CORPORATION | | | SCAC4 |
| 5 | MCPD | MCCAIN PRODUCE INCORPORATED | | | SCAC4 |
| 6 | MCPF | M C PARCEL DELIVERY INC | | | SCAC4 |
| 7 | MCPG | MCPHERS | | | SCAC4 |
| 8 | MCPH | MILLER CONTAINER CORPORATION | | | SCAC4 |
| 9 | MCPK | MC TRANSPORTATION & MC TRUCKING | | | SCAC4 |
| 10 | MCPL | MACLEOD, PHILLIP & SONS TRUCKING LT | | | SCAC4 |
| 11 | MCPO | M C TRANSPORT | | | SCAC4 |
| 12 | MCPP | MCNIE PROTECTIVE PADDLING GEAR | | | SCAC4 |
| 13 | MCPR | MCT TRANSPORTATION LLC | | | SCAC4 |
| 14 | MCPS | MONTGOMERY COUNTY PUBLIC SCHOOLS | | | SCAC4 |
| 15 | MCPU | SEALAND MAERSK ASIA PTE LTD | | SGP | BIC |
| 16 | MCPU | MCC Transport Singapore Pte Ltd. | | | RSRV |
| 17 | MCPU | MCC TRANSPORT SINGAPORE PTE LTD | | | SCAC4 |
| 18 | MCPX | Solutia Inc. | added 1/1998; 7/2000; eliminated 10/2004; 7/2005 (not listed) | | NAKINA |
| 19 | MCPX | Monsanto Co. | added 7/1964; 7/1965-1/1994; eliminated 1/1998 | | NAKINA |
| 20 | MCPX | Monsanto Chemical Co. | added 4/1962; eliminated 7/1964 | | NAKINA |
| 21 | MCPX | Mandan Creamery & Produce Co. (North American Car Corp.) | 7/1935 | | NAKINA |
| 22 | MCPX | Mandan Creamery & Produce Co. | 7/1932 | | NAKINA |
| 23 | MCPX | M.C. Peters Mill Co. | 8/1920-7/1923 | | NAKINA |
| 24 | MCPX | Monsanto Chemical Co. | added 4/62; eliminated 7/64 | | NRHS |
| 25 | MCPX | Monsanto Co. | added 7/64; 7/65-1/94; eliminated 1/98 | | NRHS |
| 26 | MCPX | Solutia Inc. | added 1/98; 7/2000 | | NRHS |
| 27 | MCPX | *M.C. PETERS MILL CO. | | | PWRC |
| 28 | MCPX | *MANDAN CREAMERY & PRODUCE CO. | | | PWRC |
| 29 | MCPX | +SOLUTIA INCORPORATED [(MONX) MONSANTO COMPANY] | | | PWRC |
| 30 | MCPX | +MICHAELS CORP. [MICHELS PIPELINE CONSTRUCTION, INC.] | | | PWRC |
| 31 | MCPX | Monsanto | | | RSRV |
| 32 | MCPX | SOLUTIA INC | | | SCAC4 |
| 33 | MCPZ | MINNESOTA CORN PROCESSORS | | | PWRC |
