| 101 | HMFA | HEARTLAND MOTOR FREIGHT INC | | | SCAC4 |
| 102 | HMFE | HIRSCH MOTOR FREIGHT | | | SCAC4 |
| 103 | HMFG | HAMMOND MANUFACTURING COMPANY LIMIT | | | SCAC4 |
| 104 | HMFH | HSC MOTOR FREIGHT | | | SCAC4 |
| 105 | HMFM | H & M FARMS LTD | | | SCAC4 |
| 106 | HMFR | HIGHLIGHT MOTOR FREIGHT INC | | | SCAC4 |
| 107 | HMFT | HOMEFRONT TRANSPORT INC | | | SCAC4 |
| 108 | HMFX | Vulcan Materials Co. | added 4/2008? | | NAKINA |
| 109 | HMFX | Florida Rock Industries, Inc. | added 4/1977; 1/1980; eliminated 5/1983; 1/1994-7/2005 (not listed) | | NAKINA |
| 110 | HMFX | Century Industries | added 10/1971; 1/1975; eliminated 4/1977 | | NAKINA |
| 111 | HMFX | Century Industries | added 10/71; 1/75 | | NRHS |
| 112 | HMFX | Florida Rock Industries, Inc. | 1/80; eliminated 5/83; 1/94-7/2000 | | NRHS |
| 113 | HMFX | *FLORIDA ROCK INDUSTRIES, INC. [CENTURY INDUSTRIES] | | | PWRC |
| 114 | HMFX | +VULCAN MATERIALS CO., CONSTRUCTION MATERIALS GROUP | | | PWRC |
| 115 | HMFX | Florida Rock Industries (Vulcan Materials) | | | RSRV |
| 116 | HMFX | VULCAN MATERIALS COMPANY CONSTRUCTI | | | SCAC4 |
| 117 | HMFX | Century Industries | | USA | TRAFFIC |
| 118 | HMGE | HUERTA MADRIGAL, GUILLERMO | | | SCAC4 |
| 119 | HMGK | HMG TRUCKING INC | | | SCAC4 |
| 120 | HMGL | HEMISPHERE GPS LLC | | | SCAC4 |
| 121 | HMGQ | H & M INTERNATIONAL TRANSPORTATION | | | SCAC4 |
| 122 | HMGS | HEMPHILL, G & SONS HOLDING INC | | | SCAC4 |
| 123 | HMGT | HAMLETT, G P TRUCKING | | | SCAC4 |
| 124 | HMHS | HEMPHILL & SON INC | | | SCAC4 |
| 125 | HMHU | OEG OFFSHORE GROUP LIMITED | | SGP | BIC |
| 126 | HMHU | Hoover Materials Handling Group | | | RSRV |
| 127 | HMHU | HOOVER MATERIALS | | | SCAC4 |
| 128 | HMHX | Tank Car Corp. of America | 7/1930-1/1975; eliminated 10/1978 | | NAKINA |
| 129 | HMHX | Tank Car Corp. of America | 4/38-1/75; eliminated 10/78 | | NRHS |
| 130 | HMHX | TANK CAR CORP. OF AMERICA | | | PWRC |
| 131 | HMHX | TANK CAR CORP OF AMERICA | | | SCAC3 |
| 132 | HMIA | HUTCHERSON METALS INC | | | SCAC4 |
| 133 | HMIB | HILLTOP MULCH INC | | | SCAC4 |
| 134 | HMIC | HANAHREUM MART INC | | | SCAC4 |
| 135 | HMIF | HANSON MFG INC | | | SCAC4 |
| 136 | HMIK | HAWKINGS, MIKE TRUCKING LLC | | | SCAC4 |
| 137 | HMINT | Hokkaido Mint Bus | Charter service only | J | TRAFFIC |
| 138 | HMIQ | HEADMASTE | | | SCAC4 |
| 139 | HMIX | Henkels & McCoy, Inc. (MofW cars) | 1/1994 (not listed); added 7/1997; 7/2000; eliminated 10/2003; 7/2005 (not listed) | | NAKINA |
| 140 | HMIX | Henkels & McCoy, Inc. (MofW cars) | 1/94; added 7/97; 7/2000 | | NRHS |
| 141 | HMIX | HENKELS & MCCOY, INC | | | PWRC |
| 142 | HMIX | Henkels and McCoy | | | RSRV |
| 143 | HMIX | HENKELS & MCCOY, INC (M & W | | | SCAC4 |
| 144 | HMIY | HONEYVILLE METAL INC | | | SCAC4 |
| 145 | HMJ | AS Ailes Limited d/b/a Harmony Jets | Callsign: Harmong Jets, | M | AVCODES |
| 146 | HMJ | Hässleholm - Markaryd Järnväg | 1897 - 1930 | S | svenska-lok.se |
| 147 | HMJG | HAYES, M & J TRUCKING INC | | | SCAC4 |
| 148 | HMJI | HAMILTON, M J INC | | | SCAC4 |
| 149 | HMJU | OASIS LEASING AND RENTAL PTE LTD | | SGP | BIC |
| 150 | HMJX | HELM Financial Corp. | added 7/1995; 7/2000-7/2005 | | NAKINA |
| 151 | HMJX | HM Joint Venture | eliminated 7/1995 | | NAKINA |
| 152 | HMJX | HELM Financial Corp. | eliminated 10/1994 | | NAKINA |
| 153 | HMJX | HM Joint Venture | added 7/1993; 1/1994 | | NAKINA |
| 154 | HMJX | HM Joint Venture | added 7/93; 1/94 | | NRHS |
| 155 | HMJX | HELM Financial Corp. | eliminated 10/94 | | NRHS |
| 156 | HMJX | HM Joint Venture | eliminated 7/95 | | NRHS |
| 157 | HMJX | HELM Financial Corp. | added 7/95; 7/2000 | | NRHS |
| 158 | HMJX | HELM EQUIPMENT LEASING CORPORATION (HELM FINANCIAL CORPORATION) | | | PWRC |
| 159 | HMJX | Helm Financial Corporation | | | RSRV |
| 160 | HMJX | HELM FINANCIAL CORPORATION | | | SCAC4 |
| 161 | HMKB | HILMARK BOATS INC | | | SCAC4 |
| 162 | HMKC | HAULMARK TRANSPORT INC | | | SCAC4 |
| 163 | HMKE | H & M TRUCKING | | | SCAC4 |
| 164 | HMKG | HAMILTON TRUCKING | | | SCAC4 |
| 165 | HMKH | HAULMAN TRUCKING INC | | | SCAC4 |
| 166 | HMKN | HALLINK RSB INC | | | SCAC4 |
| 167 | HMKO | HARIMOTO TRUCKING CO | | | SCAC1 |
| 168 | HMKO | HARIMOTO TRUCKING CO INC | | | SCAC4 |
| 169 | HMKQ | HODUM TRUCKING INC | | | SCAC4 |
| 170 | HMKS | HAULMARK SERVICES INC | | | SCAC4 |
| 171 | HMKT | HOMIAK TRANSPORT INC | | | SCAC4 |
| 172 | HMKU | WEC LINES BV | | NL | BIC |
| 173 | HMKU | HOLLAND MAAS SHIPPING BV | | | SCAC4 |
| 174 | HMKV | HUME, KEVIN | | | SCAC4 |
| 175 | HML | Hamsal Air Services Limited | IATA: 2H, | WAN | AVCODES |
| 176 | HMLB | HML BROKERAGE | | | SCAC4 |
| 177 | HMLD | HOMELAND TRANSPORTATION SERVICE INC | | | SCAC4 |
| 178 | HMLG | HAMMELL LOGISTICS INC | | | SCAC4 |
| 179 | HMLH | HARMILL HOLSTEINS | | | SCAC4 |
| 180 | HMLK | HEMLOCK PRINTERS LTD | | | SCAC4 |
| 181 | HMLN | HAMILTON TRANSPORTATION LLC | | | SCAC4 |
| 182 | HMLOK | HM lokstall | | SE | VKM |
| 183 | HMLQ | HONOLULU MARINE LLC | | | SCAC4 |
| 184 | HMLR | HUDSON MOVERS LTD | | | SCAC4 |
| 185 | HMLS | HAMMEL'S EXPRESS, INC | | | SCAC1 |
| 186 | HMLS | HOMESTRETCH LOGISTICAL SOLUTIONS IN | | | SCAC4 |
| 187 | HMLT | HAMMELL TRANSPORT SERVICE INC | | | SCAC4 |
| 188 | HMLU | HINO MOTORS LTD | | | SCAC4 |
| 189 | HMM | Hamra Air | Callsign: Hamra, Name changed to RAK Airways. | UAE | AVCODES |
| 190 | HMM | Hamra Air | | | ICAO1 |
| 191 | HMMC | HARRIS MERCANTILE & MANAGEMENT COMP | | | SCAC4 |
| 192 | HMME | HAMM | | | SCAC4 |
| 193 | HMMH | HM & M TRUCKING INC | | | SCAC4 |
| 194 | HMMJ | Hallsberg - Motala - Mjölby Järnväg | 1873 - 1879 | S | svenska-lok.se |
| 195 | HMMK | HAMM | | | SCAC4 |
| 196 | HMML | HERON MARITIME S A OF MONROVIA-LIBE | | | SCAC4 |
| 197 | HMMN | HUERTA MENDOZA, MARIA EUGENIA | | | SCAC4 |
| 198 | HMMS | HAMM | | | SCAC4 |
| 199 | HMMT | HEMME HAY & FEED INC | | | SCAC4 |
| 200 | HMMU | HMM CO., LTD. | | ROK | BIC |
