| 1 | MFFA | MIAMI FOLIAGE FORWARDERS INC | | | SCAC4 |
| 2 | MFFC | MIDWEST FRT FWDG CO INC | | | PWRC |
| 3 | MFFE | Großherzoglich Mecklenburgische Friedrich Franz Eisenbahn | | D | TRAFFIC |
| 4 | MFFF | MARTINS FAMILY FRUIT FARM LTD | | | SCAC4 |
| 5 | MFFI | MOBILIA FRUIT FARMS INC | | | SCAC4 |
| 6 | MFFO | MAYFAIR FUEL OIL CO | | | SCAC4 |
| 7 | MFFS | MEYERS FLOWERS | | | SCAC4 |
| 8 | MFFT | MOFFITT DODGE CHRYSLER LTD | | | SCAC4 |
| 9 | MFFV | M.R.S. FREIGHT FORWARDING SERVICES, INC | | | SCAC1 |
| 10 | MFFX | M4 Holdings Ltd. | added 4/1985; eliminated 1/1992; 1/1994-7/2005 (not listed) | | NAKINA |
| 11 | MFFX | Midwestern Farm Fertilizers, Inc. | 4/1961 (not listed); added 1/1963; 7/1965; eliminated 10/1965 | | NAKINA |
| 12 | MFFX | Midwestern Farm Fertilizers, Inc. | 4/61-7/65; eliminated 10/65 | | NRHS |
| 13 | MFFX | M4 Holdings Ltd. | added 4/85; eliminated 1/92; 1/94-7/2000 | | NRHS |
| 14 | MFFX | *MIDWESTERN FARM FERTILIZERS, INC. | | | PWRC |
| 15 | MFFX | +M4 HOLDINGS LTD. | | | PWRC |
| 16 | MFFX | M4 Holdings | | | RSRV |
