| 401 | HB | Hampton & Branchville R.R. Co. | 1/1975-1/1994; eliminated 7/1995; 7/2000-7/2005 | NAKINA | |
| 402 | HB | Hampton & Branchville R.R. Co. | 1/75-1/94; eliminated 7/95; 7/2000 | NRHS | |
| 403 | HB | HAMPTON & BRANCHVILLE RAILROAD COMPANY, INC | PWRC | ||
| 404 | HB | Hampton and Branchville Railroad | RSRV | ||
| 405 | HB | Hirtshalsbanen | 1925 - 1945 | DK | TRAFFIC |
| 406 | HB | Hellertal-Bahn GmbH | DE | VKM | |
| 407 | HB&T | Huntington & Broad Top Mountain R.R. & Coal Co. | Jan-52 | NRHS | |
| 408 | HBA | Trail Lake Flying Service | ICAO1 | ||
| 409 | HBA | Hafenbetrieb Aken GmbH | DE | VKM | |
| 410 | HBAE | HITCHEN, B T TRUCKING | SCAC4 | ||
| 411 | HBAI | H BAR N INC | SCAC4 | ||
| 412 | HBAM | HILDEBRAND, A & M LTD | SCAC4 | ||
| 413 | HBAR | HUBBARD TRANSPORT LLC | SCAC4 | ||
| 414 | HBAU | Hartung-Bau GmbH & Co. KG | DE | VKM | |
| 415 | HBAW | HELICON BU | SCAC4 | ||
| 416 | HBAX | Hirsch Bros. & Co. | 4/1947-4/1961; eliminated 7/1963 | NAKINA | |
| 417 | HBAX | Hirsch Bros. & Co., Inc. | 7/1935 | NAKINA | |
| 418 | HBAX | Hirsch Bros. & Co. | 1/52-4/61; eliminated 7/63 | NRHS | |
| 419 | HBAX | HIRSCH BROS. & CO. | PWRC | ||
| 420 | HBB | Hansebahn Bremen GmbH | Bremen | D | privat-bahn.de |
| 421 | HBB | City: Halberstadt | D | TRAFFIC | |
| 422 | HBB | Hansebahn Bremen | DE | VKM | |
| 423 | HBBE | HB GLOBAL LOGISTICS LLC | SCAC4 | ||
| 424 | HBBK | HARBOR INTERMODAL TRANSPORT INC | SCAC4 | ||
| 425 | HBBL | HABIB TRUCK LINES | SCAC4 | ||
| 426 | HBBR | HESSELBACHER BROS | SCAC1 | ||
| 427 | HBC | Haitian Aviation Line | ICAO1 | ||
| 428 | HBC | HAMM BREWING COMPANY | PWRC | ||
| 429 | HBC | Hamm Brewing Company | USA | TRAFFIC | |
| 430 | HBCA | HARRIS BAKING COMPANY | SCAC4 | ||
| 431 | HBCB | H & B CONSTRUCTION | SCAC4 | ||
| 432 | HBCL | HARBOR CITY OIL CO INC | SCAC4 | ||
| 433 | HBCO | HARRELL, C INC | SCAC4 | ||
| 434 | HBCT | HAPSBURG CORPORATION | SCAC4 | ||
| 435 | HBCU | HOLDERCHEM BUILDING CHEMICALS S A L | SCAC4 | ||
| 436 | HBCY | HERMANS BUILDING CENTRES | SCAC4 | ||
| 437 | HBDC | H & B DISHER COURIER (WOON | SCAC4 | ||
| 438 | HBDF | HUBERDALE FARMS | SCAC4 | ||
| 439 | HBDL | HERRBOLDT TRUCKING LLC | SCAC4 | ||
| 440 | HBDN | HOBDEN, KEITH | SCAC4 | ||
| 441 | HBDS | HARBOR DISPATCH TRANSPORT INC | SCAC4 | ||
| 442 | HBDV | HARBOR DIVISION | SCAC4 | ||
| 443 | HBDW | HIGHBOURNE TRADING LTD | SCAC4 | ||
| 444 | HBE | Halberstadt-Blankenburger Eisenbahn | D | TRAFFIC | |
| 445 | HBE | Verein zur Erhaltung der Hespertalbahn e.V. | DE | VKM | |
| 446 | HBEC | HOBBS ENTERPRISES INC | SCAC4 | ||
| 447 | HBEE | HB ENTERPRISES | SCAC4 | ||
| 448 | HBEI | HOLMES BROTHER ENTERPRISES INC | SCAC4 | ||
| 449 | HBEK | HORNBECK TRANSPORT LLC | SCAC4 | ||
| 450 | HBEL | HABEL TRANSPORTATION INC | SCAC4 | ||
| 451 | HBEN | HOFFMAN, BOB ENTERPRISES | SCAC4 | ||
| 452 | HBER | HUBER, ARLO & SON INC | SCAC4 | ||
| 453 | HBES | HUDDLESTON&BISHOP ENTERPRISES, INC | SCAC1 | ||
| 454 | HBET | HB EXPRESS INC | SCAC4 | ||
| 455 | HBEY | H & B EQUIPMENT COMPANY INC | SCAC4 | ||
| 456 | HBFA | H B FARMS (MX-240006) | SCAC4 | ||
| 457 | HBFB | HILES BROS FUEL CO INC | SCAC4 | ||
| 458 | HBFE | HR & B FEDERATED EXPRESS TRANSCORP | SCAC4 | ||
| 459 | HBFG | HERBERT FEED & GRAIN CO | SCAC4 | ||
| 460 | HBFL | HERNANDEZ BLANCAS, FELIX | SCAC4 | ||
| 461 | HBFO | HARBOR FUEL OIL CORP | SCAC4 | ||
| 462 | HBFT | HARMAN BROTHERS FREIGHT LTD | SCAC4 | ||
| 463 | HBFY | HESS BROTHERS FRUIT COMPANY | SCAC4 | ||
| 464 | HBG | Hafenbetriebsgesellschaft mbH | Hildesheim | D | privat-bahn.de |
| 465 | HBGI | HUB GROUP INC | SCAC4 | ||
| 466 | HBGL | HUBERT GLASS OIL CO | SCAC4 | ||
| 467 | HBGM | HERMANN BUSS GMBH & CIE | SCAC4 | ||
| 468 | HBGO | HELD BEREEDERUNGS GMBH & CO KG | SCAC4 | ||
| 469 | HBGP | HALLIBURTON GROUP CANADA | SCAC4 | ||
| 470 | HBGR | HOGBERG, ROBIN TODD | SCAC4 | ||
| 471 | HBGS | HUDSON LOGISTICS INC | SCAC4 | ||
| 472 | HBGX | HBG Enterprises of Tampa, Inc. | added 10/1984; 1/1994-7/2005 | NAKINA | |
| 473 | HBGX | Hillsboro Bottled Gas Co. | added 10/1968; 4/1970-1/1980; eliminated 10/1984 | NAKINA | |
| 474 | HBGX | Hugger Brothers Gravel Co. | 8/1920 | NAKINA | |
| 475 | HBGX | Hillsboro Bottled Gas Co. | added 10/68; 4/70-1/80; eliminated 10/84 | NRHS | |
| 476 | HBGX | HBG Enterprises of Tampa, Inc. | added 10/84; 1/94-7/2000 | NRHS | |
| 477 | HBGX | *HUGGER BROTHERS GRAVEL CO. | PWRC | ||
| 478 | HBGX | +HBG ENTERPRISES OF TAMPA, INC. [HILLSBORO BOTTLED GAS CO.] | PWRC | ||
| 479 | HBGX | Hillsboro Bottled Gas (HBG Enterprises of Tampa) | RSRV | ||
| 480 | HBGX | HBG ENTERPRISES OF TAMPA, INC. | SCAC4 | ||
| 481 | HBHF | H B HELLER FASHION TEAM INC | SCAC4 | ||
| 482 | HBI | CHC Denmark | ICAO1 | ||
| 483 | HBIC | HARBOR BRIDGE INTERMODAL INC | SCAC4 | ||
| 484 | HBII | HARBOUR INTERNATIONAL INCORPORATED | SCAC4 | ||
| 485 | HBIL | HILLBILLY TRANSPORT LTD | SCAC4 | ||
| 486 | HBIM | HILL BROTHERS INTERMODAL LOGISTICS | SCAC4 | ||
| 487 | HBIN | HOFFMAN, BILL | SCAC4 | ||
| 488 | HBIR | HUELLINGHOFF BROS INC | SCAC4 | ||
| 489 | HBIS | HEMPT BROTHERS INC | SCAC4 | ||
| 490 | HBIU | H B I | SCAC4 | ||
| 491 | HBIZ | HARVEST BRAND INC. | PWRC | ||
| 492 | HBJ | Horsens - Bryrup Jernbane | 1899 - 1929 | DK | jernbanen.dk |
| 493 | HBJ | Horsens - Bryrup Jernbane | 1899 - 1929 | DK | TRAFFIC |
| 494 | HBJS | HILAC BEAUTY & JEWELLERY | SCAC4 | ||
| 495 | HBKC | HAMEL BULK CARRIERS LTD | SCAC4 | ||
| 496 | HBKF | HAWBAKER FARMS | SCAC4 | ||
| 497 | HBKG | HUBERT TRUCKING INC | SCAC4 | ||
| 498 | HBKH | HERBIES TRUCKING LLC | SCAC4 | ||
| 499 | HBKK | HABECK TRUCKING INC | SCAC4 | ||
| 500 | HBKX | Hills Bros. Coffee, Inc. | 7/1932-7/1937 | NAKINA |