| 3101 | HLY | Heli Air Ltd | Callsign: Whisper, | GB | AVCODES |
| 3102 | HLYS | HOLLYS SUPER GAS | | | SCAC4 |
| 3103 | HLYX | Holly Sugar Corp. | 1/1950-10/1966; eliminated 7/1968 | | NAKINA |
| 3104 | HLYX | Holly Sugar Corp. | 1/52-10/66; eliminated 7/68 | | NRHS |
| 3105 | HLYX | HOLLY SUGAR CORP. | | | PWRC |
| 3106 | HLZA | HOLZMAN TRUCKING INC | | | SCAC4 |
| 3107 | HLZC | HILTZ, CAM TRUCKING | | | SCAC4 |
| 3108 | HLZM | HOLTZ, MIKE TRUCKING | | | SCAC4 |
| 3109 | HLZN | HERMANOS LOZANO TRUCKING | | | SCAC4 |
| 3110 | HLZO | HOLTZMAN OIL CORP | | | SCAC4 |
| 3111 | HLZR | HILTZ MOVING & STORAGE INC | | | SCAC4 |
| 3112 | HLZT | HALZIT (MARATHON ASHLAND PETROLEUM | | | SCAC4 |
| 3113 | HM | Air Seychelles Limited | ICAO: SEY, Callsign: Seychelles, IATA Prefix: 061, | SY | AVCODES |
| 3114 | HM | Humber Airways Ltd. | Callsign: Humber, | GB | AVCODES |
| 3115 | HM | Hasselmann GmbH | | DE | VKM |
| 3116 | HMA | Air Tahoma, Inc | IATA: 5C, Callsign: Tahoma, Founded in 1995. Ceased operations during 2009. | USA | AVCODES |
| 3117 | HMA | Air Tahoma | | | ICAO1 |
| 3118 | HMAA | HAL-MARI INC | | | SCAC4 |
| 3119 | HMAB | HIGH MOUNTAIN TRANSPORT INC | | | SCAC4 |
| 3120 | HMAD | HARDIN DELIVERY INC | | | SCAC4 |
| 3121 | HMAE | H M TRUCKING | | | SCAC4 |
| 3122 | HMAF | British Armed Forces | Her Majesty's Armed Forces | GB | TRAFFIC |
| 3123 | HMAG | HOME AGAIN INC | | | SCAC4 |
| 3124 | HMAH | HERBERT, MARCIA | | | SCAC4 |
| 3125 | HMAI | HAMORI AUTO INC | | | SCAC4 |
| 3126 | HMAL | HARMAC AMERICA INC | | | SCAC4 |
| 3127 | HMAM | HER-MAN TRANSFER | | | SCAC4 |
| 3128 | HMAN | H. Manhart GmbH | | AT | VKM |
| 3129 | HMAO | HUNTSVILLE MARINE AND RECREATION | | | SCAC4 |
| 3130 | HMAP | HARDESTY MOVING AND STORAGE CORP | | | SCAC4 |
| 3131 | HMAQ | H M TRANSPORT | | | SCAC4 |
| 3132 | HMAR | HOMAR ENTERPRISES LIMITED | | | SCAC4 |
| 3133 | HMAS | HOMAN, D S | | | SCAC4 |
| 3134 | HMAX | Huntsman Petrochemical Corp. | added 4/2003; 7/2005 | | NAKINA |
| 3135 | HMAX | Huntsman Corp. | added 4/1996; 7/2000; eliminated 4/2003 | | NAKINA |
| 3136 | HMAX | Huntsman Specialty Chemicals Corp. | added 7/1994; eliminated 4/1996 | | NAKINA |
| 3137 | HMAX | Huntsman Specialty Chemicals Corp. | added 7/94; eliminated 4/96 | | NRHS |
| 3138 | HMAX | Huntsman Corp. | added 4/96; 7/2000 | | NRHS |
| 3139 | HMAX | HUNTSMAN SPECIALTY CHEMICALS CORPORATION (HUNTSMAN PETROCHEMICAL) | | | PWRC |
| 3140 | HMAX | Huntsman Petrochemical | | | RSRV |
| 3141 | HMAX | HUNTSMAN PETROCHEMICAL CORPORATION | | | SCAC4 |
| 3142 | HMAY | HASKELL, M A & SONS LLC | | | SCAC4 |
| 3143 | HMB | CHC Global Operations | Callsign: Hummingbird, | CDN | AVCODES |
| 3144 | HMB | Härtsfeld-Museumsbahn e.V. | Neresheim | D | privat-bahn.de |
| 3145 | HMBAU | H&M Bau GmbH | | DE | VKM |
| 3146 | HMBC | HAMBONE TRUCKING LLC | | | SCAC4 |
| 3147 | HMBD | HAMILTON CONSTRUCTION LLC | | | SCAC4 |
| 3148 | HMBE | HAMMONIA REEDERE | | | SCAC4 |
| 3149 | HMBI | HOMAN & CO INC | | | SCAC4 |
| 3150 | HMBK | H M B TRUCKING | | | SCAC4 |
| 3151 | HMBS | HALCOMB, R & J TRANSPORTATION INC | | | SCAC4 |
| 3152 | HMBX | HELM Financial Corp. | added 1/2007 | | NAKINA |
| 3153 | HMBX | HELM FINANCIAL CORP. | | | PWRC |
| 3154 | HMBX | HELM FINANCIAL CORPORATION | | | SCAC4 |
| 3155 | HMBY | H & M BAY INC | | | SCAC4 |
| 3156 | HMBZ | HELLMANS BREWING CO. | | | PWRC |
| 3157 | HMC | Heliamerica de Mexico, S.A. de C.V. | Callsign: Heliamerica, | MEX | AVCODES |
| 3158 | HMC | Heliamerica De Mexico | | | ICAO1 |
| 3159 | HMCA | HOFFER, PETER CONTEMPORARY ART INC | | | SCAC4 |
| 3160 | HMCD | HERMAN FARM | | | SCAC4 |
| 3161 | HMCE | HIS MAJESTY COACHES INC | | | SCAC4 |
| 3162 | HMCG | H M C TRANSPORTATION INC | | | SCAC4 |
| 3163 | HMCH | HEARTLAND MOTOR COACH INC | | | SCAC4 |
| 3164 | HMCI | HEWES MARINE CO INC | | | SCAC4 |
| 3165 | HMCJ | HAGIE MANUFACTURING CO INC | | | SCAC4 |
| 3166 | HMCO | HAIRE MACHINE CORPORATION | | | SCAC4 |
| 3167 | HMCP | HENKE MANUFACTURING CORPORATION | | | SCAC4 |
| 3168 | HMCQ | H & M CONTAINER TRANSPORT INC | | | SCAC4 |
| 3169 | HMCR | The Huntsville and Madison County R.R. Authority | added 7/1985; 1/1994; eliminated 4/1997; 7/2000-7/2005 | | NAKINA |
| 3170 | HMCR | The Huntsville and Madison County R.R. Authority | 1/94; eliminated 4/97; 7/2000 | | NRHS |
| 3171 | HMCR | HUNTSVILLE & MADISON COUNTY RR AUTHORITY | | | PWRC |
| 3172 | HMCR | Huntsville and Madison County Railroad | | | RSRV |
| 3173 | HMCT | HAMILL CREEK TIMBERWRIGHTS INC | | | SCAC4 |
| 3174 | HMCU | EVERGREEN MARINE (UK) LIMITED | | GB | BIC |
| 3175 | HMCU | HATSU MARINE LTD | | | SCAC4 |
| 3176 | HMCX | SC Rail Leasing America, Inc. d/b/a Southern Illinois Railcar Co. | added 1/2008 | | NAKINA |
| 3177 | HMCX | Southern Illinois Railcar Co. | added 4/2004; 7/2005; eliminated 1/2008 | | NAKINA |
| 3178 | HMCX | HoltraChem Manufacturing Co., L.L.C. | added 7/1995; eliminated 7/1997; 7/2000 (not listed) | | NAKINA |
| 3179 | HMCX | HoltraChem Manufacturing Co., L.L.C. | added 7/95; eliminated 7/97; 7/2000 | | NRHS |
| 3180 | HMCX | *HOLTRACHEM MANUFACTURING CO., LLC | | | PWRC |
| 3181 | HMCX | +SC RAIL LEASING AMERICA d/b/a SOUTHERN ILLINOIS RAILCAR CO. | | | PWRC |
| 3182 | HMCX | HoltraChem Manufacturing | | | RSRV |
| 3183 | HMCX | VTG RAIL INC | | | SCAC4 |
| 3184 | HMCY | HOFFMANN MACHINE COMPANY INC | | | SCAC4 |
| 3185 | HMD | Charlie Hammonds Flying Service, Inc. | Callsign: Hammond, | USA | AVCODES |
| 3186 | HMD | Charlie Hammonds Flying Service | | | ICAO1 |
| 3187 | HMDA | HAMEL, DAVID INC | | | SCAC4 |
| 3188 | HMDC | HAGAN, M D TRUCKING CO | | | SCAC4 |
| 3189 | HMDD | HUNT, J B TRANSPORT INC | | | SCAC4 |
| 3190 | HMDE | HOMEDICS INC | | | SCAC4 |
| 3191 | HMDK | HAM, D & K TRUCKING LTD | | | SCAC4 |
| 3192 | HMDR | H & M DELIVERY SERVICE | | | SCAC4 |
| 3193 | HMDT | HMD TRUCKING INC | | | SCAC4 |
| 3194 | HMDU | HUBEI HAILI MEIDA AUTOMOBILE CO., LTD. | | PRC | BIC |
| 3195 | HME | Hermes Aviation | Callsign: Hergo, | M | AVCODES |
| 3196 | HMEA | HAMME | | | SCAC4 |
| 3197 | HMEC | HART MOTOR EXPRESS INC | | | PWRC |
| 3198 | HMEC | HELADOS MEXICO | | | SCAC4 |
| 3199 | HMED | H & M | | | SCAC4 |
| 3200 | HMEI | HAMILTON EQUIPMENT INC | | | SCAC4 |
