| 1 | MHTA | MINNIE HOMES TENT TRAILERS | | | SCAC4 |
| 2 | MHTB | MICHEALS TRUCKING | | | SCAC4 |
| 3 | MHTD | MCCUTCHEON TRANSPORT LTD | | | SCAC4 |
| 4 | MHTG | MULLER, H TRUCKING INC | | | SCAC4 |
| 5 | MHTI | MOOSEHEAD TRANSPORTATION INC | | | SCAC4 |
| 6 | MHTL | METHANOL HOLDINGS (TRINIDAD) LIMITE | | | SCAC4 |
| 7 | MHTM | MAHTOMEDI TRUCKING INC | | | SCAC4 |
| 8 | MHTN | MILE HIGH TRANSPORTATION SERVICES I | | | SCAC4 |
| 9 | MHTR | MESHOPPEN TRANSPORT INC | | | SCAC4 |
| 10 | MHTV | MATHIS TRANSPORTATION SERVICES | | | SCAC4 |
| 11 | MHTW | MT HOPE TRUCKING COMPANY INC | | | SCAC4 |
| 12 | MHTX | Mangels, Herold Co., Inc. | 7/1930-10/1957; eliminated 4/1960 | | NAKINA |
| 13 | MHTX | Mangels, Herold Co., Inc. | 4/38-10/57 | | NRHS |
| 14 | MHTX | MANGELS, HEROLD CO., INC. | | | PWRC |
| 15 | MHTY | M & H TRANSPORTATION | | | SCAC4 |
