| 1 | H | Hungary | H | TRAFFIC | |
| 2 | H&BT | Huntington & Broad Top Mountain R.R. & Coal Co. | 1/1941-7/1954 | NAKINA | |
| 3 | H&BT | HUNTINGTON & BROAD TOP MOUNTAIN RAILROAD & COAL CO. | PWRC | ||
| 4 | H&BV | Houston & Brazos Valley Ry. (Co.) | 7/1923-7/1954 | NAKINA | |
| 5 | H&BV | Houston & Brazos Valley Ry. | 4/38-1/52 | NRHS | |
| 6 | H&BV | HOUSTON & BRAZOS VALLEY RWY. CO. | PWRC | ||
| 7 | H&BY | Houston & Brazos Valley Ry. | 8/1920 | NAKINA | |
| 8 | H&BY | HOUSTON & BRAZOS VALLEY RWY. CO. | PWRC | ||
| 9 | H&SW | Halifax and Southwestern Ry. (Canadian National Rys.) | 8/1920-7/1923 | NAKINA | |
| 10 | H&SW | CANADIAN NATIONAN RAILWAY [HALIFAX & SOUTHWESTERN RWY.] | PWRC | ||
| 11 | H&TC | Houston & Texas Central R.R. | 4/1938-7/1954 | NAKINA | |
| 12 | H&TC | Houston & Texas Central R.R. (Southern Pacific Lines in Texas and Louisiana) | 7/1932-7/1936 | NAKINA | |
| 13 | H&TC | Houston & Texas Central R.R. (Southern Pacific Lines in Texas and Louisiana/Southern Pacific Lines West of Portland, Ogden, El Paso and Tucumcari) | 7/1930 | NAKINA | |
| 14 | H&TC | Houston & Texas Central R.R. (Southern Pacific Lines in Texas and Louisiana) | 8/1920-7/1923 | NAKINA | |
| 15 | H&TC | Houston & Texas Central R.R. | 4/38-1/52 | NRHS | |
| 16 | H&TC | HOUSTON & TEXAS CENTRAL RAILROAD (SOUTHERN PACIFIC LINES IN TEXAS & LOUISIANA) | PWRC | ||
| 17 | H0 | 1:87 | TRAFFIC | ||
| 18 | HA | Hjørring - Ålbæk | 1925 | DK | jernbanen.dk |
| 19 | HA | Nan Demo Hashiru | TRAFFIC | ||
| 20 | HAA | Helicopteros Agroforestal | ICAO1 | ||
| 21 | HAAA | HARI STONES LIMITED | SCAC4 | ||
| 22 | HAAB | HAAB, F C COMPANY INC | SCAC4 | ||
| 23 | HAAF | HALL AND SMITH ENERGY | SCAC4 | ||
| 24 | HAAG | HAAG FOODS & POULTRY INC | SCAC4 | ||
| 25 | HAAG | Haagse Tramweg Maatschappij | Real: HTM, City: Den Haag | NL | TRAFFIC |
| 26 | HAAO | HARE, J H & ASSOCIATES LTD | SCAC4 | ||
| 27 | HAARGAZ | Haargaz Group | IL | TRAFFIC | |
| 28 | HAAU | ADR-HAANPAA OY | SCAC4 | ||
| 29 | HAAW | HANSON, GREG TRUCKING | SCAC4 | ||
| 30 | HABA | HAY HAULERS UNLIMITED | SCAC4 | ||
| 31 | HABA | Stadtwerke Osnabrück AG (Hafenbahn Osnabrück) | Real: SWO | D | TRAFFIC |
| 32 | HABB | HAB NAB TRUCKING INC | SCAC4 | ||
| 33 | HABC | HALL BROS. TRANSPORTATION CO | SCAC1 | ||
| 34 | HABE | HARDEBECK TRANSPORT INC | SCAC4 | ||
| 35 | HABG | HARROD TRUCKING | SCAC4 | ||
| 36 | HABM | HART, BRIAN ANIMAL EXCHANGE | SCAC4 | ||
| 37 | HABU | AMERICA-AFRICA-EUROPE LINE GMBH | SCAC3 | ||
| 38 | HABU | HARY GMBH | SCAC4 | ||
| 39 | HABX | Habco International Inc. | 1/1994-7/2005 (not listed) | NAKINA | |
| 40 | HABX | Habco, Inc. | added 1/1972; 1/1975-1/1980; eliminated 5/1983 | NAKINA | |
| 41 | HABX | Horne-Boatright Chemical Co., Inc. | added 4/1969; 4/1970; eliminated 1/1972 | NAKINA | |
| 42 | HABX | Hanlon-Buchanan, Inc. | 7/1935-1/1946 | NAKINA | |
| 43 | HABX | Hanlon-Buchanan, Inc. | Apr-38 | NRHS | |
| 44 | HABX | Horne-Boatright Chemical Co., Inc. | added 4/69; 4/70; eliminated 1/72 | NRHS | |
| 45 | HABX | Habco, Inc. | added 1/72; 1/75-1/80; eliminated 5/83 | NRHS | |
| 46 | HABX | Habco International Inc. | 1/94-7/2000 | NRHS | |
| 47 | HABX | *HANLON-BUCHANAN, INC. | PWRC | ||
| 48 | HABX | +HABCO INTERNATIONAL INC. [HORNE-BOATRIGHT CHEMICAL CO., INC.] | PWRC | ||
| 49 | HABX | Habco International | RSRV | ||
| 50 | HABX | HABCO INTERNATIONAL INC. | SCAC4 | ||
| 51 | HAC | Henebury Aviation | ICAO1 | ||
| 52 | HAC | Hokkaido Air System | Real: NTH, 6L | J | TRAFFIC |
| 53 | HACA | HAINAULT LLC | SCAC4 | ||
| 54 | HACC | HAWK TRANSPORTATION INC | SCAC4 | ||
| 55 | HACD | HADLEY SEED FARM | SCAC4 | ||
| 56 | HACE | HAAG TRANSPORT INC | SCAC4 | ||
| 57 | HACH | HACHE EXPRESS INC | SCAC4 | ||
| 58 | HACK | HACK & SONS TRUCKING | SCAC4 | ||
| 59 | HACK | Hackney Community Transport | GB | TRAFFIC | |
| 60 | HACL | HARTWIG TRUCKING INC | SCAC4 | ||
| 61 | HACO | HALLCO TRANSPORT SYSTEMS INC | SCAC4 | ||
| 62 | HACR | H & A EXPRESS INC | SCAC4 | ||
| 63 | HACT | HAMMOND AIR CONDITIONING LTD | SCAC4 | ||
| 64 | HACU | CONTENEMAR SA | SCAC4 | ||
| 65 | HACV | HARRIS AIRCRAFT SERVICES INC | SCAC4 | ||
| 66 | HACX | Canada Packers Ltd. | eliminated 4/1971 | NAKINA | |
| 67 | HACX | Canada Packers Ltd. (The Harris Abbatoir Co., Ltd.) | 7/1935-4/1970 | NAKINA | |
| 68 | HACX | The Harris Abbatoir Co., Ltd. (Canada Packers Ltd.) | 7/1932 | NAKINA | |
| 69 | HACX | Canada Packers Ltd. (The Harris Abbatoir Co., Ltd.) | 4/38-4/70 | NRHS | |
| 70 | HACX | Canada Packers Ltd. | eliminated 4/71 | NRHS | |
| 71 | HACX | CANADA PACKERS LTD. [HARRIS ABBATOIR CO., LTD.] | PWRC | ||
| 72 | HADB | HALO DISTRIBUTING COMPANY | SCAC4 | ||
| 73 | HADD | HALL, GEO A INC | SCAC4 | ||
| 74 | HADF | HARDEN FURNITURE INC | SCAC4 | ||
| 75 | HADI | HILLSBORO TRANSPORTATION COMPANY | SCAC4 | ||
| 76 | HADL | HYUNDAI AUSTRALIA DIRECT LINE | SCAC4 | ||
| 77 | HADM | HONEYWELL AEROSPACE DE MEXICO SA DE | SCAC4 | ||
| 78 | HADT | HADLEYS TRUCKING LLC | SCAC4 | ||
| 79 | HADV | HARBOUR ADVANCED MACHINING | SCAC4 | ||
| 80 | HADY | HADLEY EXHIBITS INC | SCAC4 | ||
| 81 | HADZ | HAWTHORNE ARMY AMMUNITION DEPOT | PWRC | ||
| 82 | HAEC | HALLOWELL EMC | SCAC4 | ||
| 83 | HAED | HARTWIG, ED, TRUCKING&EXCAVATING, INC | SCAC1 | ||
| 84 | HAEI | Heartland Express | SCAC2 | ||
| 85 | HAEI | HEARTLAND EXPRESS SERVICES INC | SCAC4 | ||
| 86 | HAEI | Heartland Express | USA | TRAFFIC | |
| 87 | HAEQ | HAUL-ALL EQUIPMENT LTD | SCAC4 | ||
| 88 | HAES | HARLEYS ELECTRICAL SERVICES LTD | SCAC4 | ||
| 89 | HAEU | HAEWOO GLS CO LTD | SCAC4 | ||
| 90 | HAEW | HAUSER, ED, TRUCK SERVICE | SCAC1 | ||
| 91 | HAEW | HAUSER, ED TRUCKING SERVICE INCORPO | SCAC4 | ||
| 92 | HAF | Hellenic Air Force | ICAO1 | ||
| 93 | HAFB | HILLFIELD AIRBASE | PWRC | ||
| 94 | HAFC | HAFNERS, CHUCK FARMERS MARKET AND G | SCAC4 | ||
| 95 | HAFE | HAFER, WM | SCAC1 | ||
| 96 | HAFF | H & FRIENDS FREIGHT INC | SCAC4 | ||
| 97 | HAFG | HARBOR FREIGHT TRANSPORT CORP | SCAC4 | ||
| 98 | HAFI | HALEY TRACTOR & EQUIPMENT | SCAC4 | ||
| 99 | HAFK | HAFER TRUCK SERVICE INC | SCAC4 | ||
| 100 | HAFL | HARBIN FREIGHT LINES/BHM EXPRESS (D | SCAC4 |