| 201 | HMMU | HYUNDAI MERCHANT MARINE | | | SCAC4 |
| 202 | HMNA | HAMAR & ASSOCIATES INC | | | SCAC4 |
| 203 | HMNE | HALFMOON EXPRESS INC | | | SCAC4 |
| 204 | HMNG | HARMON TRUCKING | | | SCAC1 |
| 205 | HMNH | INTERMARINE CARRIER | | | SCAC1 |
| 206 | HMNH | HOLMAN SHIPPING INC | | | SCAC4 |
| 207 | HMNI | HENDERSON, M & N INC | | | SCAC4 |
| 208 | HMNL | HARTMAN, LOREN T | | | SCAC4 |
| 209 | HMNN | H & M TRANSPORTATION INC | | | SCAC4 |
| 210 | HMNQ | HOMER MOVING & STORAGE CO INC | | | SCAC4 |
| 211 | HMNT | HARMON MOTOR TRANSPORT | | | SCAC4 |
| 212 | HMO | Helicopter Operations Mexico, . De R.L. de C.V. | Callsign: Heli-Corp, | MEX | AVCODES |
| 213 | HMOA | HOME OIL & GAS COMPANY INC | | | SCAC4 |
| 214 | HMOC | HOME OIL CO LLC | | | SCAC4 |
| 215 | HMOE | HOLMES OIL LLC | | | SCAC4 |
| 216 | HMOI | H MOVING & STORAGE INC | | | SCAC4 |
| 217 | HMOL | HICKS MOTOR LINE INC | | | SCAC4 |
| 218 | HMOS | HENDRICK MOTORSPORTS | | | SCAC4 |
| 219 | HMOY | HOME OIL CO INC | | | SCAC4 |
| 220 | HMP | Papair Terminal, S.A. | Callsign: Papair Terminal, | RH | AVCODES |
| 221 | HMP | Papair Terminal | | | ICAO1 |
| 222 | HMPC | HAMMONS PRODUCTS COMPANY | | | SCAC4 |
| 223 | HMPD | HAMILTON PAPER BOX CO LTD | | | SCAC4 |
| 224 | HMPF | HAMILTON PLASTIC FABRICATORS (1997) | | | SCAC4 |
| 225 | HMPG | HAMPS TRUCKING | | | SCAC4 |
| 226 | HMPK | HOMAY, PATRICK | | | SCAC4 |
| 227 | HMPL | HAMPL TRANSPORTATION INCORPORATED | | | SCAC4 |
| 228 | HMPM | HOMA PETROLEUM | | | SCAC4 |
| 229 | HMPN | HAMPTON TRUCKING L L C | | | SCAC4 |
| 230 | HMPO | HAMPTON FUEL INC | | | SCAC4 |
| 231 | HMPP | HEMPEL TRANSPORTATION LLC | | | SCAC4 |
| 232 | HMPQ | HIKE METAL PRODUCTS LIMITED | | | SCAC4 |
| 233 | HMPT | HAMPTON ROADS MOVING & STORAGE (HAM | | | SCAC4 |
| 234 | HMPU | HOYER GMBH | | D | BIC |
| 235 | HMPX | Halstead Metal Products, Inc. | added 1/1966; 10/1966; eliminated 7/1969 | | NAKINA |
| 236 | HMPX | National Car Co. | 1/1945-4/1947 | | NAKINA |
| 237 | HMPX | Halstead Metal Products, Inc. | added 1/66; 10/66; eliminated 7/69 | | NRHS |
| 238 | HMPX | *NATIONAL CAR CO. | | | PWRC |
| 239 | HMPX | *HALSTEAD METAL PRODUCTS, INC. | | | PWRC |
| 240 | HMPY | HUMPHRYS TEXTILE PRODUCTS | | | SCAC4 |
| 241 | HMR | North American Charters | Callsign: Hammer, | CDN | AVCODES |
| 242 | HMR | Global Reach Aviation A/S | Callsign: Hammer, | DK | AVCODES |
| 243 | HMR | North American Charters | | | ICAO1 |
| 244 | HMR | Hoboken Manufacturers | 1/1980-7/2005 | | NAKINA |
| 245 | HMR | Hoboken Manufacturers | 1/80-7/2000 | | NRHS |
| 246 | HMR | *HUNTSVILLE MADISON COUNTY RAILROAD AUTHORITY | | | PWRC |
| 247 | HMR | +HOBOKEN MANUFACTURERS RR. | | | PWRC |
| 248 | HMR | Hoboken Manufacturers | | | RSRV |
| 249 | HMRA | HATCHER, M R | | | SCAC4 |
| 250 | HMRC | HAMRAC TRUCKING | | | SCAC4 |
| 251 | HMRK | HAMME | | | SCAC4 |
| 252 | HMRL | HAMPTON ROADS LEASING INC | | | SCAC4 |
| 253 | HMRM | HAMERS | | | SCAC4 |
| 254 | HMRN | HANSEN, MARVIN | | | SCAC4 |
| 255 | HMRO | HIND MOTORS INC | | | SCAC4 |
| 256 | HMRQ | HANSEN, MICHAEL R INC | | | SCAC4 |
| 257 | HMRR | HUMMER VENTURES LTD | | | SCAC4 |
| 258 | HMRU | HYUNDAI MOTORSPORT GMBH | | D | BIC |
| 259 | HMRV | HENRY MARINE SERVICE INC | | | SCAC4 |
| 260 | HMS | Hemus Air | IATA: DU, Callsign: Hemus Air, IATA Prefix: 748, Merged into Bulgaria Air FB/LZB in 2010 | BG | AVCODES |
| 261 | HMS | Hemus Air | IATA: DU | | ICAO1 |
| 262 | HMS | Royal (british) Navy | | GB | TRAFFIC |
| 263 | HMSC | HARMS TRUCKING INC | | | SCAC4 |
| 264 | HMSD | HALL MOTOR SPORTS | | | SCAC4 |
| 265 | HMSE | H M S EXPRESS INC | | | SCAC4 |
| 266 | HMSF | HAROLD MAINTENANCE SERVICE INC | | | SCAC4 |
| 267 | HMSH | HS MEDEA SHIPPING COMPANY LTD | | | SCAC4 |
| 268 | HMSJ | HMS TRANSPORT LLC | | | SCAC4 |
| 269 | HMSK | HERCULES MOVING SYSTEMS INC | | | SCAC4 |
| 270 | HMSM | HUMBOLDT STORAGE AND MOVING COMPANY | | | SCAC4 |
| 271 | HMSN | HANSEATIC MOVING SERVICES LLC | | | SCAC4 |
| 272 | HMSQ | HITCO MOVING & STORAGE SERVICE | | | SCAC4 |
| 273 | HMSR | HMS INTEGRATED MANAGEMENT SYSTEMS L | | | SCAC4 |
| 274 | HMSU | MED LOGISTICS (MALTA) LTD | | M | BIC |
| 275 | HMSU | MED SERVICES SHIPPING LTD | | | SCAC4 |
| 276 | HMSV | HOME SERVICE OIL COMPANY | | | SCAC4 |
| 277 | HMSY | HORIZON MOVING SYSTEMS INC | | | SCAC4 |
| 278 | HMT | Air Nova | Callsign: Hamilton, Ceased operations. | GB | AVCODES |
| 279 | HMT | Hemet Exploration | | F | AVCODES |
| 280 | HMT | Air Nova | | | ICAO1 |
| 281 | HMTA | HIGH MOUNTAIN TRANSPORT LLC | | | SCAC4 |
| 282 | HMTC | HAMMOND TRANSFER COMPANY INC | | | SCAC4 |
| 283 | HMTE | HOMETOWNE ENERGY | | | SCAC4 |
| 284 | HMTF | HOMETOWN EXPRESS FUEL CORP | | | SCAC4 |
| 285 | HMTG | HENNINGS, MATT TRUCKING | | | SCAC4 |
| 286 | HMTH | HARBOR MOTOR TRANS INC | | | SCAC4 |
| 287 | HMTI | HAZARDOUS MATERIAL TRANSPORTATION I | | | SCAC4 |
| 288 | HMTJ | H AND M TERMINAL TRANSPORT, INC | | | SCAC1 |
| 289 | HMTJ | HOT MIX TRANSPORTS INC | | | SCAC4 |
| 290 | HMTK | HARWELL, MARK TRUCKING LLC | | | SCAC4 |
| 291 | HMTL | HARMONY TRANSPORT LTD | | | SCAC4 |
| 292 | HMTM | HOMETOWN MOVING CO | | | SCAC4 |
| 293 | HMTP | H & M TRANSPORTATION | | | SCAC4 |
| 294 | HMTS | HOLMAN TRANSPORTATION SERVICES INC | | | SCAC4 |
| 295 | HMTT | HOMETOWN TRANSPORTATION INC | | | SCAC4 |
| 296 | HMTV | H & M TRANSFER | | | SCAC4 |
| 297 | HMTX | General American Transportation Corp. | 7/1937-1/1941 | | NAKINA |
| 298 | HMTX | Hyman Michaels Tank Line, Inc. (General American Tank Car Corp.) | 7/1935 | | NAKINA |
| 299 | HMTX | Hyman Michaels Tank Line, Inc. | 7/1930 | | NAKINA |
| 300 | HMTX | Hyman Michaels Tank Line, Inc. (Liquids Despatch Line, Inc.) | 7/1932 | | NAKINA |
