| 801 | HCRO | HALLS OF CROSS INC | SCAC4 | ||
| 802 | HCRR | Honey Creek R.R., Inc. | 1/1994-7/2005 | NAKINA | |
| 803 | HCRR | Honey Creek R.R., Inc. | 1/94-7/2000 | NRHS | |
| 804 | HCRR | HONEY CREEK RAILROAD, INC. | PWRC | ||
| 805 | HCRR | Honey Creek Railroad | RSRV | ||
| 806 | HCRR | HONEY CREEK RAILROAD INC | SCAC4 | ||
| 807 | HCRR | Honey Creek Railroad Inc. | USA | TRAFFIC | |
| 808 | HCRT | HCR TRUCKING | SCAC4 | ||
| 809 | HCRU | SAF | SCAC4 | ||
| 810 | HCRX | Union Refrigerator Transit Lines, a Division of the General American Transporation Corp. | 10/1966; eliminated 1/1970 | NAKINA | |
| 811 | HCRX | Union Refrigerator Transit Lines | added 10/1963; 7/1965 | NAKINA | |
| 812 | HCRX | Houston Creosoting Co. | 1/1950 (not listed) | NAKINA | |
| 813 | HCRX | Harding Cream Co. (North Western Refrigerator Line Co.) | 7/1935 | NAKINA | |
| 814 | HCRX | Union Refrigerator Transit Lines | Jul-65 | NRHS | |
| 815 | HCRX | Union Refrigerator Transit Lines, a Division of the General American Transporation Corp. | 10/66; eliminated 1/70 | NRHS | |
| 816 | HCRX | *HOUSTON CREOSOTING CO. | PWRC | ||
| 817 | HCRX | *HEBER CREEPER RAILWAY CO. | PWRC | ||
| 818 | HCRX | *UNION REFRIGERATOR LINES, DIV. GENERAL AMERICAN TRANSPORTATION CORP. | PWRC | ||
| 819 | HCRY | Huron Central Ry. | added 10/1998; 7/2000-7/2005 | NAKINA | |
| 820 | HCRY | Huron Central Ry. | added 10/98; 7/2000 | NRHS | |
| 821 | HCRY | HURON CENTRAL RAILWAY | PWRC | ||
| 822 | HCRY | Huron Central Railway | RSRV | ||
| 823 | HCRY | HURON CENTRAL RAILWAY INC | SCAC4 | ||
| 824 | HCRY | Huron Central Railway | CDN | TRAFFIC | |
| 825 | HCSB | HOLY CITY SOLUTIONS LLC | SCAC4 | ||
| 826 | HCSK | HILLCREST TRUCKING & STORAGE INC | SCAC4 | ||
| 827 | HCST | H COLD STORAGE | SCAC4 | ||
| 828 | HCSU | HACON CONTAINERS BV | SCAC4 | ||
| 829 | HCSX | Helm Chesapeake Limited Partnership | added 10/2001; 7/2005 | NAKINA | |
| 830 | HCSX | HELM CHESAPEAKE, LP | PWRC | ||
| 831 | HCSX | Helm Chesapeake | RSRV | ||
| 832 | HCSX | HELM CHESAPEAKE LIMITED PARTNERSHIP | SCAC4 | ||
| 833 | HCSX | Helm Chesapeake Limited Partnership | USA | TRAFFIC | |
| 834 | HCSY | HS CARMEN SHIPPING COMPANY LTD | SCAC4 | ||
| 835 | HCTA | HELMS, CHRIS TRANSPORTATION LLC | SCAC4 | ||
| 836 | HCTB | HAT CREEK TRUCK BROKERAGE CORP | SCAC4 | ||
| 837 | HCTC | HAMPTON, CHRIS TRUCKING | SCAC4 | ||
| 838 | HCTD | HIGH COUNTRY TRANSPORTATION INC | SCAC4 | ||
| 839 | HCTG | HACKL, J K TRANSPORTATION SERVICES | SCAC4 | ||
| 840 | HCTI | HITCHCOCK TRUCKING INC | SCAC4 | ||
| 841 | HCTM | HARRIS CAMDEN TERMINAL EQUIPMENT CO | SCAC4 | ||
| 842 | HCTOR | Hector Rail AB | 2004 - | S | svenska-lok.se |
| 843 | HCTOR | Hector Rail AB | SE | VKM | |
| 844 | HCTR | HILL COUNTRY TRUCKING INC | SCAC4 | ||
| 845 | HCTT | HIGH COUNTRY TRANSPORT LTD | SCAC4 | ||
| 846 | HCTU | COMMISSARIAT DE LA MARINE | SCAC4 | ||
| 847 | HCTV | HELICOPTER TRANSPORT SERVICES INC | SCAC4 | ||
| 848 | HCTX | Martin Marietta Corp. | added 4/1990; 1/1994; eliminated 7/1996; 7/2000 (not listed) | NAKINA | |
| 849 | HCTX | Hallett Construction Co. | added 4/1971; 1/1975-1/1980; eliminated 4/1990 | NAKINA | |
| 850 | HCTX | Hallett Construction Co. | added 4/71; 1/75-1/80; eliminated 4/90 | NRHS | |
| 851 | HCTX | Martin Marietta Corp. | added 4/90; 1/94; eliminated 7/96; 7/2000 | NRHS | |
| 852 | HCTX | *HALLETT CONSTRUCTION CO. | PWRC | ||
| 853 | HCTX | *(MMAX) MARTIN MARIETTA CORPORATION | PWRC | ||
| 854 | HCTX | Hallett Construction (Martin Marietta Corporation) | RSRV | ||
| 855 | HCV | Hamburg City Vision | City: Hamburg, Sightseeing | D | TRAFFIC |
| 856 | HCVU | HONG CHUN ELECTRIC & MACHINERY CO L | SCAC4 | ||
| 857 | HCWC | HOLY COW CANOE CO | SCAC4 | ||
| 858 | HCX | Hallet and Carey Ltd. | added 1/1953; eliminated 10/1953 | NAKINA | |
| 859 | HCX | Merchants Despatch Transportation Corp. | 1/1941-1/1950 | NAKINA | |
| 860 | HCX | Hardwood Chemical Co. (General American Transportation Corp.) | 7/1935 | NAKINA | |
| 861 | HCX | Hallet and Carey Ltd. | added 1/53; eliminated 10/53 | NRHS | |
| 862 | HCX | *MERCHANTS DESPATCH TRANSPORTATION CORP. | PWRC | ||
| 863 | HCX | *HALLET & CAREY LTD. | PWRC | ||
| 864 | HCXC | HOC TRANSPORT COMPANY | SCAC4 | ||
| 865 | HCXN | HCS TRANSPORTATION | SCAC4 | ||
| 866 | HCY | Helios Airways | IATA: ZU | ICAO1 | |
| 867 | HCY | Hill City Ry. Co. | 7/1923 | NAKINA | |
| 868 | HCY | HILL CITY RWY. CO. | PWRC | ||
| 869 | HCYR | Horry County Ry. Co. | added 7/1985; eliminated 1/1988 | NAKINA | |
| 870 | HCYR | Horry County Ry. Co. | eliminated 1/88 | NRHS | |
| 871 | HCYR | HORRY COUNTY RAILWAY CO. | PWRC | ||
| 872 | HCYR | Horry County Railway | RSRV | ||
| 873 | HCZ | HERCULES COMPANY | PWRC | ||
| 874 | HCZU | Harding Containers International | RSRV | ||
| 875 | HCZU | HARDING CONTAINERS INTERNATIONAL IN | SCAC4 | ||
| 876 | HD | Holger Dietz | DE | VKM | |
| 877 | HDA | Dragonair, Hong Kong Dragon Airlines | IATA: KA | ICAO1 | |
| 878 | HDA | Dragonair | HK | TRAFFIC | |
| 879 | HDAE | HEIFETZ, DAVID | SCAC4 | ||
| 880 | HDAI | HERNANDEZ DIAZ, ANTONIO MARTIN G | SCAC4 | ||
| 881 | HDAV | H A D D TRUCKING LLC | SCAC4 | ||
| 882 | HDBA | HALF DIAMOND EXPRESS LTD | SCAC4 | ||
| 883 | HDBB | HILL DE BAJA CALIFORNIA | SCAC4 | ||
| 884 | HDBE | HILDEBRAND, JIM | SCAC4 | ||
| 885 | HDBG | HYDER, B & A TRUCKING CO INC | SCAC4 | ||
| 886 | HDBQ | HYDE DRIFT BOATS INCORPORATED | SCAC4 | ||
| 887 | HDBS | HOUND DOG BUS | SCAC4 | ||
| 888 | HDBX | Blery Oil Co. | 8/1920 | NAKINA | |
| 889 | HDBX | BLERY OIL CO. | PWRC | ||
| 890 | HDC | Helcopteros De Cataluna | ICAO1 | ||
| 891 | HDCM | HURTADO CRUZ, MIGUEL | SCAC4 | ||
| 892 | HDCN | HUDD TRANSPORTATION | SCAC4 | ||
| 893 | HDCO | H DANTAS COMERCIO NAVEGACAO E INDUS | SCAC4 | ||
| 894 | HDCR | HILLSDALE COUNTY RAILWAY | PWRC | ||
| 895 | HDCR | HAPPY D CORPORATION | SCAC4 | ||
| 896 | HDCW | HOLMAN DISTRIBUTION CENTER OF WASHINGTON, INC | SCAC1 | ||
| 897 | HDCW | HOLMAN TRANSPORTATION LLC | SCAC4 | ||
| 898 | HDCX | The Hull Corp. | 1/1994 (not listed) | NAKINA | |
| 899 | HDCX | The Hull Corp. | Jan-94 | NRHS | |
| 900 | HDCX | THE HULL CORPORATION | PWRC |