| 201 | HDTN | HEAVY DUTY TRANSAXLE INC | | | SCAC4 |
| 202 | HDTT | HANNAH, DAVID TRANSPORTATION | | | SCAC4 |
| 203 | HDTX | Sun Products Corp. | added 1/2009 | | NAKINA |
| 204 | HDTX | Huish Detergents, Inc. | added 4/2007; eliminated 1/2009 | | NAKINA |
| 205 | HDTX | HUISH DETERGENTS, INC. | | | PWRC |
| 206 | HDTX | SUN PRODUCTS CORPORATION | | | SCAC4 |
| 207 | HDUG | DHUGGA TRUCKING LTD | | | SCAC4 |
| 208 | HDVF | HDVS FREIGHT SYSTEMS INC | | | SCAC4 |
| 209 | HDVS | HOLIDAY VAN & STORAGE | | | SCAC4 |
| 210 | HDW | Hafendienste Wilhelmshaven GmbH | Wilhelmshafen | D | privat-bahn.de |
| 211 | HDWC | HEADWIN LOGISTICS CO LTD | | | SCAC4 |
| 212 | HDWE | HODGINS, DWAYNE | | | SCAC4 |
| 213 | HDWH | HICKMAN, DALE W HAULING | | | SCAC4 |
| 214 | HDWL | HADDIX, WILLIAM | | | SCAC4 |
| 215 | HDX | Hooker-Detrex Inc. | 1/1950-7/1954; eliminated 10/1956 | | NAKINA |
| 216 | HDX | Hooker-Detrex Inc. | Jan-52 | | NRHS |
| 217 | HDX | HOOKER-DETREX INC. | | | PWRC |
| 218 | HDXC | HERDRICH TRANSPORT LLC | | | SCAC4 |
| 219 | HDXL | HD TRANSPORTATION LLC | | | SCAC4 |
| 220 | HDXN | HILLSIDE TRANSPORT INC | | | SCAC4 |
| 221 | HDXO | HENDRIX OIL INC | | | SCAC4 |
| 222 | HDXS | HAMMOND TRANSPORTATION INC | | | SCAC4 |
| 223 | HDXU | HDS LINES | | | SCAC4 |
| 224 | HDYC | HANDY TRUCKING COMPANY LLC | | | SCAC4 |
| 225 | HDYE | HARDY, EARL TRUCKING INC | | | SCAC4 |
| 226 | HDYK | HEAVY DUTY TRUCKERS LLC | | | SCAC4 |
| 227 | HDYL | HUB DELIVERY INC | | | SCAC4 |
| 228 | HDYO | HARDY OIL TRANSPORT | | | SCAC4 |
