| 4901 | HWNS | H & W TRANSPORTATION | SCAC4 | ||
| 4902 | HWNT | HILL, WARREN TRUCKING INC | SCAC4 | ||
| 4903 | HWOC | HOWES OIL CO INC | SCAC4 | ||
| 4904 | HWOM | HAMILTON WILBER OIL COMPANY INC | SCAC4 | ||
| 4905 | HWOO | HUNTERWOOD TECHNOLOGIES LTD | SCAC4 | ||
| 4906 | HWORMS | Stadthafen Worms | D | TRAFFIC | |
| 4907 | HWPC | HOLLAND WIRE PRODUCTS INC | SCAC4 | ||
| 4908 | HWPR | HWP RIGGING | SCAC4 | ||
| 4909 | HWPX | Hiram Walker & Sons, Inc. | added 1/1965; 7/1965-7/2005; eliminated 7/2007 | NAKINA | |
| 4910 | HWPX | Hiram Walker & Sons, Inc. | added 1/65; 7/65-7/2000 | NRHS | |
| 4911 | HWPX | HIRAM WALKER & SONS, INC. | PWRC | ||
| 4912 | HWPX | Hiram Walker and Sons | RSRV | ||
| 4913 | HWPX | WALKER, HIRAM & SONS INC | SCAC3 | ||
| 4914 | HWRC | HALL, W R COMPANY INC | SCAC4 | ||
| 4915 | HWRD | HOWARDS INC | SCAC4 | ||
| 4916 | HWRE | Heinrich Wilhelm Waggonbau- und Vertriebs GmbH & Co. KG | DE | VKM | |
| 4917 | HWRF | HOWE, ROBERT F | SCAC4 | ||
| 4918 | HWRI | HWR | SCAC4 | ||
| 4919 | HWRK | HARSHAW TRUCKING | SCAC4 | ||
| 4920 | HWRS | HAND, W R & SONS TRUCKING LLC | SCAC4 | ||
| 4921 | HWRX | Hi-Way Refineries Ltd. | 4/1947-1/1952; eliminated 7/1953 | NAKINA | |
| 4922 | HWRX | Hi-Way Refineries Ltd. | Jan-52 | NRHS | |
| 4923 | HWRX | HI-WAY REFINERIES LTD. | PWRC | ||
| 4924 | HWSC | HOMEWOOD SCAVENGER SERVICE, INC | SCAC1 | ||
| 4925 | HWSD | HUMBLE WAREHOUSE AND DISTRIBUTION C | SCAC4 | ||
| 4926 | HWSK | HENRYS WRECKER SERVICE | SCAC4 | ||
| 4927 | HWSN | HAWKEYE STAGES INC | SCAC4 | ||
| 4928 | HWSU | HIRAM WALKER AND SONS LTD | SCAC4 | ||
| 4929 | HWSV | HWY SEVEN ZERO (70) TOWING & | SCAC4 | ||
| 4930 | HWSX | Hiram Walker & Sons, Ltd. | 7/1937-1/1975; eliminated 10/1977 | NAKINA | |
| 4931 | HWSX | Hiram Walker & Sons, Ltd. | 4/38-1/75 | NRHS | |
| 4932 | HWSX | HIRAM WALKER & SONS,, LTD. | PWRC | ||
| 4933 | HWSX | WALKER, HIRAM & SONS LTD | SCAC3 | ||
| 4934 | HWTA | HIAWATHA | SCAC4 | ||
| 4935 | HWTB | HUDSON, WAYNE TRUCKING | SCAC4 | ||
| 4936 | HWTC | HAWK TRANSPORTATION SERVICES INC | SCAC4 | ||
| 4937 | HWTD | HATHAWAY TRADING LIMITED | SCAC4 | ||
| 4938 | HWTE | HAWTHORNEDEN | SCAC4 | ||
| 4939 | HWTF | HALL WORLDWIDE TRANSPORTATION LLC | SCAC4 | ||
| 4940 | HWTG | HEWITT TRUCKING LTD | SCAC4 | ||
| 4941 | HWTJ | HEAVY WEIGHT TRANSPORT INC | SCAC4 | ||
| 4942 | HWTL | HAWTHORNE, LELAND R & SON INC OF DE | SCAC4 | ||
| 4943 | HWTO | H & W TRANSFER & STORAGE INC | SCAC4 | ||
| 4944 | HWTQ | HARRIS, WILLIAM TRUCKING | SCAC4 | ||
| 4945 | HWTR | H & W TOURS INC | SCAC4 | ||
| 4946 | HWTT | H & W TRANSPORTATION LOGISTICS LLC | SCAC4 | ||
| 4947 | HWTV | HOT WHEELS TRANSPORT | SCAC4 | ||
| 4948 | HWTW | HARLEYS WELDING & TRANS LLC | SCAC4 | ||
| 4949 | HWUL | HONGWU LOGISTICS (USA) INC | SCAC4 | ||
| 4950 | HWV | Hamburger Waggonvermletung GmbH | DE | VKM | |
| 4951 | HWVL | HOWARDS VAN LINES INC | SCAC4 | ||
| 4952 | HWVQ | HOWELL VENTURES LTD | SCAC4 | ||
| 4953 | HWWI | HOLIDAY WORLDWIDE INC | SCAC4 | ||
| 4954 | HWWL | HELLMANN WORLD WIDE LOGISTICS INC | SCAC4 | ||
| 4955 | HWWT | HOWE, WAYNE TRUCKING | SCAC4 | ||
| 4956 | HWX | Wilcox Oil Co. | 1/1945-10/1957; eliminated 7/1958 | NAKINA | |
| 4957 | HWX | H.F. Wilcox Oil & Gas Co. | 7/1923-1/1943 | NAKINA | |
| 4958 | HWX | H.F. Wilcox Oil & Gas Co. | Apr-38 | NRHS | |
| 4959 | HWX | Wilcox Oil Co. | 1/52-10/57; eliminated 7/58 | NRHS | |
| 4960 | HWX | WILCOX OIL CO. [H. F. WILCOX OIL & GAS CO.] | PWRC | ||
| 4961 | HWXL | HEWES TRANSPORTATION LLC | SCAC4 | ||
| 4962 | HWXP | HI WAY EXPRESS INC | SCAC4 | ||
| 4963 | HWY | Highland Airways | ICAO1 | ||
| 4964 | HWYC | HIGHWAY TRUCKING CO | SCAC4 | ||
| 4965 | HWYG | HIGHWAY TECHNOLOGIES INC | SCAC4 | ||
| 4966 | HWYI | HWY SIXTEEN (16) INC | SCAC4 | ||
| 4967 | HWYO | HWY ONE ONE (11) MAFIA | SCAC4 | ||
| 4968 | HWYP | HIGHWAY TRANSPORT INC | SCAC4 | ||
| 4969 | HWZ | HUNT-WESSON, INC. | PWRC | ||
| 4970 | HWZ | Hellerich Wehrs GmbH | DE | VKM | |
| 4971 | HX | Hickok Oil Corp. | 7/1932-1/1946 | NAKINA | |
| 4972 | HX | Hickok Oil Corp. (General American Tank Car Corp.) | 7/1930 | NAKINA | |
| 4973 | HX | Hickok Oil Corp. | Apr-38 | NRHS | |
| 4974 | HX | HICKOK OIL CORP. 9GENERAL AMERICAN TANK CAR CO.) | PWRC | ||
| 4975 | HX | Heathrow Express | 1999: standard gauge, electrified at 25kV 50Hz. The Heathrow Express service between London Paddington station and Heathrow Airport is operated by BAA plc, the airport authority. From June 1997 trains are operated between Paddington and the entrance of the tunnel under the airport, every 15 minutes. | GB | TRAFFIC |
| 4976 | HX | Heathrow Express | UK | VKM | |
| 4977 | HXA | China Express Airlines | ICAO1 | ||
| 4978 | HXA | Hamburg Airlines | Real: HX | D | TRAFFIC |
| 4979 | HXAL | HELENS TRANSPORTATION LLC | SCAC4 | ||
| 4980 | HXCC | HORNS EXPRESS | SCAC4 | ||
| 4981 | HXCU | TIANJIN HUAXI TRADE & TRANSPORTATIO | SCAC4 | ||
| 4982 | HXIC | HIGHLANDER XPRES INC | SCAC4 | ||
| 4983 | HXLH | HERSON XPRESS LLC | SCAC4 | ||
| 4984 | HXLI | HOUTEX LOGISTICS INC | SCAC4 | ||
| 4985 | HXLL | HX LOGISTICS LLC | SCAC4 | ||
| 4986 | HXLP | HOLLINGSWORTH EXPEDITING LANE PARTN | SCAC4 | ||
| 4987 | HXNT | HEXION TRANSPORTATION INC | SCAC4 | ||
| 4988 | HXPE | HARLAN XPRESS | SCAC4 | ||
| 4989 | HXSI | HAMNER TRANSPORTATION SYSTEMS INC | SCAC4 | ||
| 4990 | HXTL | HOOSON, ADAM TRANSPORT LTD | SCAC4 | ||
| 4991 | HXTW | H TWO (H2) EXPRESS | SCAC4 | ||
| 4992 | HYA | Hyack Air | ICAO1 | ||
| 4993 | HYAJ | HYATT, JIM PRODUCE CO INC | SCAC4 | ||
| 4994 | HYAP | HYDRA TRANSPORTATION | SCAC4 | ||
| 4995 | HYAR | HILLYARD FARMS | SCAC4 | ||
| 4996 | HYAT | HYBRID TRANSIT SYSTEMS INC | SCAC4 | ||
| 4997 | HYAU | PETROCHEMICA | SCAC4 | ||
| 4998 | HYBB | HOLIWAY TRANSPORT | SCAC4 | ||
| 4999 | HYBD | HYBUR LTD | SCAC4 | ||
| 5000 | HYBE | HYBELS, BERT R INC | SCAC4 |