| 601 | HBX | *HOBO RAILROAD EXPRESS | PWRC | ||
| 602 | HBXC | HRIBAR TRANSPORT LLC | SCAC4 | ||
| 603 | HBXL | HILL BROS EXPRESSWAYS LTD | SCAC4 | ||
| 604 | HBXP | HUGGY BEAR EXPRESS INC | SCAC4 | ||
| 605 | HBXS | H B XPRESS INC | SCAC4 | ||
| 606 | HBXT | HUMBLE TRANSPORT LLC | SCAC4 | ||
| 607 | HBYB | HAMBY, BRUCE TRUCKING INC | SCAC4 | ||
| 608 | HC | Hannibal Connecting R.R. | 1/1946-7/1965 | NAKINA | |
| 609 | HC | Hannibal Connecting | 1/52-7/65 | NRHS | |
| 610 | HC | Arbeitskreis Historischer Zug Hessencourier e.V. | Kassel | D | privat-bahn.de |
| 611 | HC | HANNIBAL CONNECTING RAILROAD | PWRC | ||
| 612 | HC | Hessencourier e.V | DE | VKM | |
| 613 | HCA | Lake Havasu Air Service | ICAO1 | ||
| 614 | HCAA | HAROLD TRUCKING INC | SCAC4 | ||
| 615 | HCAC | HERNDON, C HAYNE & CO INC | SCAC4 | ||
| 616 | HCAE | HERNANDEZ CANTU, AARON BARTOLO | SCAC4 | ||
| 617 | HCAH | HOLT CAT | SCAC4 | ||
| 618 | HCAI | HEDRICK, DAVID K TRUCKING | SCAC4 | ||
| 619 | HCAX | HENNEPIN COUNTY REGIONAL RAIL | PWRC | ||
| 620 | HCB | Helenair (Barbados) | ICAO1 | ||
| 621 | HCBC | Hokkaido Chuo Bus Co., Ltd. | J | TRAFFIC | |
| 622 | HCBP | HCB TRANSPORT | SCAC4 | ||
| 623 | HCBT | HIGH CUBE TRANSPORTATION LTD | SCAC4 | ||
| 624 | HCBX | Chevron Phillips Chemical Co., LP | added 4/2002; 7/2005 | NAKINA | |
| 625 | HCBX | CHEVRON PHILLIPS CHEMICAL CO. LP | PWRC | ||
| 626 | HCBX | Chevron Phillips Chemical | RSRV | ||
| 627 | HCBX | CHEVRON PHILLIPS CHEMICAL COMPANY L | SCAC4 | ||
| 628 | HCCC | HEROIC CAPRICORNUS INC | SCAC4 | ||
| 629 | HCCE | HIRSCH, CHARLES C TRUCKING | SCAC4 | ||
| 630 | HCCG | HC - CHARTERING GMBH | SCAC4 | ||
| 631 | HCCM | HARMONY COUNTRY COOPERATIVE | SCAC4 | ||
| 632 | HCCS | HANCOCK CARRIERS INC | SCAC4 | ||
| 633 | HCCT | HELENA CHEMICAL CO | SCAC4 | ||
| 634 | HCCU | HCCR HAMBURGER CONTAINER UND CHASSI | SCAC4 | ||
| 635 | HCCV | HCC SERVICE COMPANY | SCAC4 | ||
| 636 | HCCX | Southeastern Industrial Enterprises, Inc. | added 10/2002; 7/2005 | NAKINA | |
| 637 | HCCX | Hercules Cement Co. | added 4/1981 | NAKINA | |
| 638 | HCCX | Hercules Cement Co., An AMCORD Co. | added 1/1978; 1/1980; eliminated 4/1981 | NAKINA | |
| 639 | HCCX | Hercules Cement Co., a Division of American Cement Corp. | added 4/1973; 1/1975; eliminated 1/1978 | NAKINA | |
| 640 | HCCX | Hercules Division—American Cement Corp. | added 7/1966; 10/1966-4/1970; eliminated 4/1973 | NAKINA | |
| 641 | HCCX | Hercules Cement Co. | added 10/1963; 7/1965; eliminated 7/1966 | NAKINA | |
| 642 | HCCX | Hercules Cement Corp. | 7/1935-7/1954; eliminated 10/1957 | NAKINA | |
| 643 | HCCX | Hercules Cement Corp. | 4/38-1/52; eliminated 10/57 | NRHS | |
| 644 | HCCX | Hercules Cement Co. | 7/65; eliminated 7/66 | NRHS | |
| 645 | HCCX | Hercules Division--American Cement Corp. | added 7/66; 10/66-4/70; eliminated 4/73 | NRHS | |
| 646 | HCCX | Hercules Cement Co., a Division of American Cement Corp. | added 4/73; 1/75; eliminated 1/78 | NRHS | |
| 647 | HCCX | Hercules Cement Co., An AMCORD Co. | added 1/78; 1/80; eliminated 4/81 | NRHS | |
| 648 | HCCX | Hercules Cement Co. | added 4/81 | NRHS | |
| 649 | HCCX | *HERCULES CEMENT COMPANY | PWRC | ||
| 650 | HCCX | +SOUTHEASTERN INDUSTRIAL ENTERPRISES, INC. | PWRC | ||
| 651 | HCCX | Hercules Cement | RSRV | ||
| 652 | HCCX | SOUTHEASTERN INDUSTRIAL ENTERPRISES | SCAC4 | ||
| 653 | HCCZ | HARRISON CEMENT COMPANY | PWRC | ||
| 654 | HCDD | HUNT, J B TRANSPORT INC | SCAC4 | ||
| 655 | HCDI | HERNANDEZ CAMARENA, DAVID ENRIQUE | SCAC4 | ||
| 656 | HCDK | HICKORY DICKORY DECKS | SCAC4 | ||
| 657 | HCDL | HIGEAR CDL | SCAC4 | ||
| 658 | HCDU | ER NAHRUNGSMITTEL GMBH & COMPANY KG. | PWRC | ||
| 659 | HCDU | ER Nahrungsmittel GmBH and KG | RSRV | ||
| 660 | HCDU | CONTAINERDIENST HANS HAEMMERLE | SCAC3 | ||
| 661 | HCDU | CONTAINERDIENST HANS HAEMMERLE GMBH | SCAC4 | ||
| 662 | HCDY | HOSS CARTAGE & DISTRIBUTION | SCAC4 | ||
| 663 | HCEA | HIGH CARGO EXPRESSS LLC | SCAC4 | ||
| 664 | HCEC | HARBOR CHOICE EXPRESS LTD CORP | SCAC4 | ||
| 665 | HCEK | HIGHWAY CARRIER EXPRESS LLC | SCAC4 | ||
| 666 | HCEL | HIGH COUNTRY EXPRESS LLC | SCAC4 | ||
| 667 | HCEP | HIGHBOOST CORP | SCAC4 | ||
| 668 | HCEZ | HAWLEY CI-OP ELEVATOR | PWRC | ||
| 669 | HCFD | HOMEWOOD COL FARMS LTD | SCAC4 | ||
| 670 | HCFK | HORSESHOE CREEK FARMS LTD | SCAC4 | ||
| 671 | HCFM | HILLSBOROUGH COUNTY FLEET MANAGEMEN | SCAC4 | ||
| 672 | HCFN | HAT CREEK FARM INC | SCAC4 | ||
| 673 | HCFR | HILLSIDE CONTEMPORARY FURNISHINGS | SCAC4 | ||
| 674 | HCFT | HIGH COUNTRY FREIGHT LLC | SCAC4 | ||
| 675 | HCFX | H.C. Frick Coke Co. | 8/1920-7/1923 | NAKINA | |
| 676 | HCFX | H. C. FRICK COKE CO. | PWRC | ||
| 677 | HCGO | HULL COOPERATIVE ASSOCIATION | SCAC4 | ||
| 678 | HCGR | HAMMOND CARGO SERVICES, INC | SCAC1 | ||
| 679 | HCGU | Houston Container Connection | RSRV | ||
| 680 | HCGX | North American Salt Co. | added 1/1995; 7/2000-7/2005 | NAKINA | |
| 681 | HCGX | North American Salt Co. | added 1/95; 7/2000 | NRHS | |
| 682 | HCGX | NORTH AMERICAN SALT COMPANY | PWRC | ||
| 683 | HCGX | North American Salt | RSRV | ||
| 684 | HCGX | NORTH AMERICAN SALT | SCAC4 | ||
| 685 | HCHK | HAPCHUK INC | SCAC4 | ||
| 686 | HCHS | HIRSCHFELD STEEL CO INC | SCAC4 | ||
| 687 | HCHT | HUACHUCA TRANSFER CO | SCAC4 | ||
| 688 | HCHU | HUNCHUN FANHAI INTERNATIONAL FORWAR | SCAC4 | ||
| 689 | HCHX | Heyden Chemical Corp. | 7/1930-1/1946; 4/1947 (not listed) | NAKINA | |
| 690 | HCHX | Heyden Chemical Corp. | Apr-38 | NRHS | |
| 691 | HCHX | HEYDEN CHEMICAL CORP. | PWRC | ||
| 692 | HCHY | HERNDON, C HAYNE | SCAC4 | ||
| 693 | HCIB | HUDSON CO INC | SCAC4 | ||
| 694 | HCID | HIBBS &CO INC | SCAC4 | ||
| 695 | HCIG | HAMMEL-CALIFORNIA INC | SCAC4 | ||
| 696 | HCIK | HONDURAS CARIBBEAN INC | SCAC4 | ||
| 697 | HCIL | HUB CITY TERMINALS INC | SCAC4 | ||
| 698 | HCIO | HI-LINE COOPERATIVE INC | SCAC4 | ||
| 699 | HCIP | HAGEY COACH INC | SCAC4 | ||
| 700 | HCIS | HAWKES CO INC | SCAC4 |