| 1 | OHTA | ONE HORN TRANSPORTATION INC | | | SCAC4 |
| 2 | OHTH | OPHARDT HYGIENE TECHNOLOGIES INC | | | SCAC4 |
| 3 | OHTI | OLE HICKORY TRANSPORT INC | | | SCAC3 |
| 4 | OHTN | OVERLAND HORSE TRANSPORTATION | | | SCAC3 |
| 5 | OHTP | OHIO TRANSPORT CORPORATION INC | | | SCAC3 |
| 6 | OHTP | OHIO TRANSPORT CORPORATION INC | | | SCAC4 |
| 7 | OHTQ | OHIO TRUCK SERVICE INC | | | SCAC3 |
| 8 | OHTR | O & H TRUCKING | | | SCAC3 |
| 9 | OHTR | OHIO TIRE TRANSPORTATION | | | SCAC4 |
| 10 | OHTW | O'HARE TOWING | | | SCAC4 |
| 11 | OHTX | O&H Transport, Inc. | added 10/1967; 4/1970-1/1980 | | NAKINA |
| 12 | OHTX | O&H Transport, Inc. | added 10/67; 4/70-1/80 | | NRHS |
| 13 | OHTX | O & h TRANSPORT, INC. | | | PWRC |
