| 701 | HCIU | STEAM PACKET YARD | PWRC | ||
| 702 | HCIU | Steam Packet Yard | RSRV | ||
| 703 | HCIU | CAPITAL INTERMODAL LIMITED | SCAC4 | ||
| 704 | HCIX | HARCROS CHEMICALS INC | SCAC4 | ||
| 705 | HCJI | HESSE, C J INC | SCAC4 | ||
| 706 | HCKB | HACKMANN BBROTHERS INC | SCAC4 | ||
| 707 | HCKG | HECKMAN TRUCKING INC | SCAC4 | ||
| 708 | HCKL | HICKS OIL CO INC | SCAC4 | ||
| 709 | HCKN | HUB CITY KANSAS CITY, L.P. | SCAC1 | ||
| 710 | HCKN | HUB GROUP INC | SCAC4 | ||
| 711 | HCKP | HICKS-CO INC | SCAC4 | ||
| 712 | HCKQ | HICKMAN MOVING & STORAGE | SCAC4 | ||
| 713 | HCKR | HACKETT TRUCK | SCAC4 | ||
| 714 | HCKS | HICKS TRUCKING COMPANY OF LITCHFIEL | SCAC4 | ||
| 715 | HCL | Helenair Corporation | ICAO1 | ||
| 716 | HCLB | HIGHTAIL CARRIERS LLC | SCAC4 | ||
| 717 | HCLE | HELVETIA CONTAINER LINE | SCAC4 | ||
| 718 | HCLH | HORIZON COACH LINES LTD | SCAC4 | ||
| 719 | HCLJ | HOMELAND CARRIERS LLC | SCAC4 | ||
| 720 | HCLK | HEDLUND CONTRACTING LTD | SCAC4 | ||
| 721 | HCLL | HANSEATIC CONTAINER LINE LTD | SCAC4 | ||
| 722 | HCLM | HERMANNS CONTRACTING LIMITED | SCAC4 | ||
| 723 | HCLOG | HEICON Service GmbH | DE | VKM | |
| 724 | HCLQ | HIGH CUBE LLC | SCAC4 | ||
| 725 | HCLR | HILLTOP RANCH INC | SCAC4 | ||
| 726 | HCLS | HIDRA CONTROL | SCAC4 | ||
| 727 | HCLT | HORNOI, C L TRUCKING | SCAC4 | ||
| 728 | HCLV | HAVI CONTAINER LINE LIMITED | SCAC4 | ||
| 729 | HCLX | Basell Canada Inc. | added 1/2001; 7/2005; eliminated 1/2009 | NAKINA | |
| 730 | HCLX | Montell Canada Inc. | added 4/1996; 7/2000; eliminated 1/2001 | NAKINA | |
| 731 | HCLX | HIMONT Canada Inc. | added 1/1984; 1/1994; eliminated 4/1996 | NAKINA | |
| 732 | HCLX | Hercules Canada Ltd. | added 4/1979; 1/1980; eliminated 1/1984 | NAKINA | |
| 733 | HCLX | Hercules Canada Ltd. | added 4/79; 1/80 | NRHS | |
| 734 | HCLX | HIMONT Canada Inc. | 1/94; eliminated 4/96 | NRHS | |
| 735 | HCLX | Montell Canada Inc. | added 4/96; 7/2000; eliminated 1/2001 | NRHS | |
| 736 | HCLX | Basell Canada Inc. | added 1/2001 | NRHS | |
| 737 | HCLX | BASSEL CANADA, INC. [MONTELL CANADA INC.HIMONT CANADA, INC.; HERCULES CANADA LTD.] | PWRC | ||
| 738 | HCLX | HIMONT Canada (Basell Canada) | RSRV | ||
| 739 | HCLX | BASELL CANADA INC | SCAC4 | ||
| 740 | HCLY | HECO LIMITED | SCAC4 | ||
| 741 | HCM | Vermietung von Maschinen und Geräten Dienstleistungen für Eisenbahnverkehrsunternehmen | DE | VKM | |
| 742 | HCMA | HSIN CHIEN MARINE CO LTD | SCAC4 | ||
| 743 | HCMN | HERCULES MOVERS INC | SCAC4 | ||
| 744 | HCMS | HIPPIE CHIC MARINE SERVICES INC | SCAC4 | ||
| 745 | HCMSA | Huta Cynku “Miasteczko Śląskie” SPÓŁKA AKCYJNA | PL | VKM | |
| 746 | HCMX | Harnischfeger Corp. | added 10/1976; 1/1980-7/2000; eliminated 4/2001; added 7/2001; 7/2005; eliminated 10/2006 | NAKINA | |
| 747 | HCMX | Harnischfeger Corp. | 1/80-7/2000; eliminated 4/2001; added 7/2001 | NRHS | |
| 748 | HCMX | HARNISCHFEGER CORP. | PWRC | ||
| 749 | HCMX | Harnischfeger Corporation | RSRV | ||
| 750 | HCN | Halcyon Air/Bissau Airways | ICAO1 | ||
| 751 | HCN | HOLIDAY COACH LINES INC | SCAC4 | ||
| 752 | HCNC | HUTCHENS CONSTRUCTION COMPANY | SCAC4 | ||
| 753 | HCNI | HILL COUNTRY NURSERIES INC | SCAC4 | ||
| 754 | HCNW | HUB CITY NORTH CENTRAL | SCAC4 | ||
| 755 | HCO | HOWE COAL (OKLAHOMA) | PWRC | ||
| 756 | HCOC | HALLS CONCRETE | SCAC4 | ||
| 757 | HCOD | HEARTLAND COOP | SCAC4 | ||
| 758 | HCOF | HILL CITY OIL COMPANY INC | SCAC4 | ||
| 759 | HCOJ | HUBZONE CORPORATION | SCAC4 | ||
| 760 | HCOK | HALLMARK CORP | SCAC4 | ||
| 761 | HCOO | HEETCO INC | SCAC4 | ||
| 762 | HCOR | HARRIS CORPORATION | SCAC4 | ||
| 763 | HCOS | HANKS CONSTRUCTION | SCAC4 | ||
| 764 | HCOU | CONICAL CONTAINER INDUSTRIE | SCAC3 | ||
| 765 | HCOU | CONICAL CONTAINER INDUSTRIE CONSULT | SCAC4 | ||
| 766 | HCOW | HUNT CRUDE OIL SUPPLY COMPANY | SCAC4 | ||
| 767 | HCOY | HOLMFIELD COLONY FARMS | SCAC4 | ||
| 768 | HCP | Helicopter | ICAO1 | ||
| 769 | HCP | H. Cegielski – Fabryka Pojazdów Szynowych | City: Poznan | PL | TRAFFIC |
| 770 | HCPF | HOLLER, CECIL H POULTRY FARM LLC | SCAC4 | ||
| 771 | HCPN | HESS CORPORATION | SCAC4 | ||
| 772 | HCPR | HCP RECYCLING | SCAC4 | ||
| 773 | HCPX | Occidental Chemical Corp. | added 1/1992; 1/1994-7/2005 | NAKINA | |
| 774 | HCPX | Occidental Chemical Corp., Electrochemicals & Specialty Products | added 10/1989; eliminated 1/1992 | NAKINA | |
| 775 | HCPX | Occidental Chemical Corp., Electrochemicals, Detergents & Specialty Products | added 1/1988; eliminated 10/1989 | NAKINA | |
| 776 | HCPX | Occidental Chemical Corp., Electrochemicals, Detergent & Specialty Products Group | added 7/1987; eliminated 1/1988 | NAKINA | |
| 777 | HCPX | Occidental Chemical Corp., Industrial & Specialty Chemicals | added 7/1984; eliminated 7/1987 | NAKINA | |
| 778 | HCPX | Occidental Chemical Corp., Hooker Industrial & Specialty Chemicals | added 10/1982; eliminated 7/1984 | NAKINA | |
| 779 | HCPX | Hooker Chemical and Plastics Corp. | added 7/1974; 1/1975-1/1980; eliminated 10/1982 | NAKINA | |
| 780 | HCPX | Hooker Chemical Corp. | added 4/1965; 7/1965-4/1970; eliminated 7/1974 | NAKINA | |
| 781 | HCPX | Hooker Chemical Corp. | added 4/65; 7/65-4/70 | NRHS | |
| 782 | HCPX | Hooker Chemical and Plastics Corp. | 1/75-1/80; eliminated 10/82 | NRHS | |
| 783 | HCPX | Occidental Chemical Corp., Hooker Industrial & Specialty Chemicals | added 10/82; eliminated 7/84 | NRHS | |
| 784 | HCPX | Occidental Chemical Corp., Industrial & Specialty Chemicals | added 7/84; eliminated 7/87 | NRHS | |
| 785 | HCPX | Occidental Chemical Corp., Electrochemicals, Detergent & Specialty Products Group | added 7/87; eliminated 1/88 | NRHS | |
| 786 | HCPX | Occidental Chemical Corp., Electrochemicals, Detergents & Specialty Products | added 1/88; eliminated 10/89 | NRHS | |
| 787 | HCPX | Occidental Chemical Corp., Electrochemicals & Specialty Products | added 10/89; eliminated 1/92 | NRHS | |
| 788 | HCPX | Occidental Chemical Corp. | added 1/92; 1/94-7/2000 | NRHS | |
| 789 | HCPX | HOOKER INDUSTRIAL & SPECIALTY CHEMICALS (OCCIDENTAL CHEMICAL CORP.) | PWRC | ||
| 790 | HCPX | Occidental Chemical Corporation (Hooker Industrial and Specialty Chemicals) | RSRV | ||
| 791 | HCPX | OCCIDENTAL CHEMICAL CORP., AGRICULT | SCAC4 | ||
| 792 | HCQJ | HIGUERA CARDENAS, CARLOS HUMBERTO A | SCAC4 | ||
| 793 | HCR | Straßenbahn Herne Castrop-Rauxel GmbH | City: Castrop-Rauxel | D | TRAFFIC |
| 794 | HCRA | HILCO TRANSPORT INC | SCAC4 | ||
| 795 | HCRC | Hillsdale County Ry. Co., Inc. | 1/1980-1/1994; eliminated 4/1994 | NAKINA | |
| 796 | HCRC | Hillsdale County Ry. Co., Inc. | 1/80-1/94; eliminated 4/94 | NRHS | |
| 797 | HCRC | HILLSDALE COUNTY RAILWAY COMPANY (OUT OF SERVICE) | PWRC | ||
| 798 | HCRC | Hillsdale County Railway | RSRV | ||
| 799 | HCRI | HEARTLAND CARRIERS INC | SCAC4 | ||
| 800 | HCRL | HEALTH CARE RELOCATIONS | SCAC4 |