| 1 | DTDA | DEEANNS TRUCKING DISPATCHERS | | | SCAC4 |
| 2 | DTDC | DAY TO DAY LOGISTICS INC | | | SCAC4 |
| 3 | DTDD | D TRANS | | | SCAC4 |
| 4 | DTDE | D & T DELIVERY INC | | | SCAC4 |
| 5 | DTDF | DEPENDABLE TRANSPORT INC | | | SCAC4 |
| 6 | DTDJ | DALTON TRUCKING INC | | | SCAC4 |
| 7 | DTDK | DANS TRANSPORT CORP | | | SCAC4 |
| 8 | DTDL | DOOR TO DOOR SERVICES | | | SCAC4 |
| 9 | DTDQ | DIRT DOCTORS LLC | | | SCAC4 |
| 10 | DTDR | DTD CARGO SA | | | SCAC4 |
| 11 | DTDS | DAWN TO DAWN EXPRESS | | | SCAC4 |
| 12 | DTDX | Dow Chemical Co., Texas Division | 4/1961; added 10/1961; 7/1965; eliminated 1/1966 | | NAKINA |
| 13 | DTDX | General American Transportation Corp. | added 7/1958; eliminated 10/1958 | | NAKINA |
| 14 | DTDX | Dow Chemical Co., Texas Division | 1/1943-10/1957; eliminated 7/1958 | | NAKINA |
| 15 | DTDX | Dow Chemical Co., Texas Division | 1/52-10/57; eliminated 7/58 | | NRHS |
| 16 | DTDX | General American Transportation Corp. | added 7/58; eliminated 10/58 | | NRHS |
| 17 | DTDX | Dow Chemical Co., Texas Division | 4/61-7/65; eliminated 1/66 | | NRHS |
| 18 | DTDX | DOW CHEMICAL CO., TEXAS DIV. (GENERAL AMERICAN TRANSPORTATION CORP.) | | | PWRC |
