| 501 | HBKX | HILLS BROTHERS COFFEE, INC. | PWRC | ||
| 502 | HBL | Faroecopter | ICAO1 | ||
| 503 | HBL | Harbor Belt Line | 1/1994-7/2005 | NAKINA | |
| 504 | HBL | Harbor Belt Line | 1/94-7/2000 | NRHS | |
| 505 | HBL | HARBOR BELT LINE RAILROAD | PWRC | ||
| 506 | HBL | Harbor Belt Line | RSRV | ||
| 507 | HBLA | HERBAL GARDEN, THE | SCAC4 | ||
| 508 | HBLD | HARBORLITE DISTRIBUTION CORP | SCAC4 | ||
| 509 | HBLL | H B LOGISTICS LLC | SCAC4 | ||
| 510 | HBLP | HBL EXPRESS INC | SCAC4 | ||
| 511 | HBLU | SHANGHAI BALIN INTERNATIONAL TRANSP | SCAC4 | ||
| 512 | HBM | Hafenbahn Mülheim | D | TRAFFIC | |
| 513 | HBMC | HAYDEN BUILDING MAINTENANCE CORP | SCAC4 | ||
| 514 | HBMH | H BECK MACHINERY LTD | SCAC4 | ||
| 515 | HBMI | HEBERT, MEUNERIE INC | SCAC4 | ||
| 516 | HBMR | HONEY BEE MANUFACTURING LTD | SCAC4 | ||
| 517 | HBMU | HOPE BAY MINING LTD | SCAC4 | ||
| 518 | HBMX | Henry Bower Chemical Manufacturing Co. | 8/1920-7/1923 | NAKINA | |
| 519 | HBMX | HENRY BROWER CHEMICAL MANUFACTURING CO. | PWRC | ||
| 520 | HBN | Verein Hafenbahn Neustrelitz e.V | DE | VKM | |
| 521 | HBNS | HUEBNER & SON TRUCKING INC | SCAC4 | ||
| 522 | HBNT | HOLBORN TRUCKING | SCAC4 | ||
| 523 | HBO | HARMON BROS CHARTER SERVICES INC | SCAC4 | ||
| 524 | HBOF | HOBBS LEASING INC | SCAC4 | ||
| 525 | HBOR | HARBOR RAIL TRANSPORT, Intermodal Container Service, INC | SCAC1 | ||
| 526 | HBOR | HARBOR RAIL TRANSPORT | SCAC4 | ||
| 527 | HBOT | HUNTER BOTTLING | SCAC4 | ||
| 528 | HBP | Hornonitrianske bane Prievidza, a.s. | SK | VKM | |
| 529 | HBPN | HARVEST BLEND PET NUTRITION INC | SCAC4 | ||
| 530 | HBRA | HILDEBRAND, BERNIE & RON | SCAC4 | ||
| 531 | HBRB | HARBAUER, ROBERT K | SCAC4 | ||
| 532 | HBRC | HIBBARD, ROBERT TRUCKING | SCAC4 | ||
| 533 | HBRD | HEBERT, DANIEL | SCAC4 | ||
| 534 | HBRE | HUTTERIAN BRETHREN OF KYLE | SCAC4 | ||
| 535 | HBRI | HEBERT, P J INC | SCAC4 | ||
| 536 | HBRJ | HIGHWAY, BRUCE | SCAC4 | ||
| 537 | HBRK | HARBOR TRUCKING LTD | SCAC4 | ||
| 538 | HBRO | HEEREN BROS INC | SCAC4 | ||
| 539 | HBRP | HADLEY, BRIAN RALPH | SCAC4 | ||
| 540 | HBRQ | HBR TRUCKING INC | SCAC4 | ||
| 541 | HBRU | HERNANDEZ BELLO S I | SCAC4 | ||
| 542 | HBRY | Hudson Bay Ry. Co. | added 10/1997; 7/2000-7/2005; eliminated 4/2006 | NAKINA | |
| 543 | HBRY | Hudson Bay Ry. Co. | added 10/97; 7/2000 | NRHS | |
| 544 | HBRY | HUDSON BAY RAILWAY COMPANY (OMNITRAX) | PWRC | ||
| 545 | HBRY | Hudson Bay Railway (OmniTRAX) | RSRV | ||
| 546 | HBRY | HUDSON BAY RAILWAY COMPANY | SCAC4 | ||
| 547 | HBRY | Hudson Bay Railway Company (Omnitrax) | USA | TRAFFIC | |
| 548 | HBS | Horsens - Bryrup - Silkeborg (Bryrupbanen) | 1929 - 1968 | DK | jernbanen.dk |
| 549 | HBS | Hoboken Shore R.R. | 1/1975; eliminated 7/1977; 1/1980 | NAKINA | |
| 550 | HBS | Hoboken Shore R.R. | 1/75; eliminated 7/77; 1/80 | NRHS | |
| 551 | HBS | HOBOKEN SHORE RAILROAD | PWRC | ||
| 552 | HBS | Hoboken Shore R.R. | USA | TRAFFIC | |
| 553 | HBSD | HEMISPHE | SCAC4 | ||
| 554 | HBSD | Horsens - Bryrup - Silkeborg (Bryrupbanen) | Real: HBS, 1929 - 1968 | DK | TRAFFIC |
| 555 | HBSK | HOBUS TRUCKING | SCAC4 | ||
| 556 | HBSO | HALBERT & SON | SCAC4 | ||
| 557 | HBSU | HANBAO CONTAINER SHIPPING & TRADING | SCAC4 | ||
| 558 | HBSV | HANDBELL SERVICES INC | SCAC4 | ||
| 559 | HBSX | Purex Corp., Ltd. | 4/1961 | NAKINA | |
| 560 | HBSX | Purex Corp. | added 1/1957; 10/1957 | NAKINA | |
| 561 | HBSX | Haskins Bros. & Co. | 8/1920; 7/1935-7/1954; eliminated 1/1957 | NAKINA | |
| 562 | HBSX | Haskins Bros. & Co. | 4/38-1/52 | NRHS | |
| 563 | HBSX | Purex Corp. | Oct-57 | NRHS | |
| 564 | HBSX | Purex Corp., Ltd. | Apr-61 | NRHS | |
| 565 | HBSX | *HASKINS BROS. & CO. | PWRC | ||
| 566 | HBSX | *PUREX CORP., LTD. | PWRC | ||
| 567 | HBT | Polizeihubschrauberstaffel Thuringen | ICAO1 | ||
| 568 | HBT | Houston Belt & Terminal Ry. Co. | 1/1975-1/1994; eliminated 1/1998; added 10/1999; 7/2000-7/2005 | NAKINA | |
| 569 | HBT | Houston Belt & Terminal Ry. Co. | 1/75-1/94; eliminated 1/98; added 10/99; 7/2000 | NRHS | |
| 570 | HBT | HOUSTON BELT & TERMINAL RAILWAY | PWRC | ||
| 571 | HBT | Houston Belt and Terminal Railway | RSRV | ||
| 572 | HBT | HOUSTON BELT & TERMINAL RAILWAY COM | SCAC4 | ||
| 573 | HBT | Houston Belt and Terminal Railway | USA | TRAFFIC | |
| 574 | HBTB | HORSESHOE BAY TRANSLOAD INC | SCAC4 | ||
| 575 | HBTC | HORAB TRANSPORT COMPANY | SCAC4 | ||
| 576 | HBTF | HUNTERS BAY TRUCKING LLC | SCAC4 | ||
| 577 | HBTH | HOYT BROTHERS TRUCKING INC | SCAC4 | ||
| 578 | HBTK | H & B TRUCKING LLC | SCAC4 | ||
| 579 | HBTM | HAWKS BLUFF TRUCKING INC | SCAC4 | ||
| 580 | HBTN | HORNADY TRANSPORTATION LLC | SCAC4 | ||
| 581 | HBTO | HILL BROTHERS TRANSPORTATION INC (D | SCAC4 | ||
| 582 | HBTU | HANBAO CONTAINER SHIPPING & TRADING | SCAC4 | ||
| 583 | HBTV | HILL BROS TRANSPORTATION INC (TEMPE | SCAC4 | ||
| 584 | HBTW | HASTINGS, BEN TRUCKING | SCAC4 | ||
| 585 | HBTY | HANNA BROTHERS TRANSPORT INC | SCAC4 | ||
| 586 | HBU | Universal Avia | ICAO1 | ||
| 587 | HBUG | HB TRUCKING | SCAC4 | ||
| 588 | HBV | MISSOURI PACIFIC [HOUSTON & BRAZOS VALLEY RY] | PWRC | ||
| 589 | HBVS | HARBOUR VIEW VARIETY | SCAC4 | ||
| 590 | HBWI | HUDSON BOAT WORKS INC | SCAC4 | ||
| 591 | HBWK | HUTCHINSONS BOAT WORKS INC | SCAC4 | ||
| 592 | HBWM | HARBOUR WEST MARINE TRANSPORT | SCAC4 | ||
| 593 | HBWU | WEW WESTERWAELDER EISENWERK GMBH | SCAC4 | ||
| 594 | HBWX | Georgia Power Co. | added 1/1997; 7/2000-7/2005 | NAKINA | |
| 595 | HBWX | Georgia Power Co. | added 1/97; 7/2000 | NRHS | |
| 596 | HBWX | GEORGIA POWER COMPANY | PWRC | ||
| 597 | HBWX | Georgia Power | RSRV | ||
| 598 | HBX | Hately Bros. Co. | 8/1920-7/1954; eliminated 4/1957 | NAKINA | |
| 599 | HBX | Hately Bros. Co. | 4/38-1/52; eliminated 4/57 | NRHS | |
| 600 | HBX | *HATELY BROS. CO. | PWRC |