| 3301 | HMMJ | Hallsberg - Motala - Mjölby Järnväg | 1873 - 1879 | S | svenska-lok.se |
| 3302 | HMMK | HAMM | | | SCAC4 |
| 3303 | HMML | HERON MARITIME S A OF MONROVIA-LIBE | | | SCAC4 |
| 3304 | HMMN | HUERTA MENDOZA, MARIA EUGENIA | | | SCAC4 |
| 3305 | HMMS | HAMM | | | SCAC4 |
| 3306 | HMMT | HEMME HAY & FEED INC | | | SCAC4 |
| 3307 | HMMU | HMM CO., LTD. | | ROK | BIC |
| 3308 | HMMU | HYUNDAI MERCHANT MARINE | | | SCAC4 |
| 3309 | HMNA | HAMAR & ASSOCIATES INC | | | SCAC4 |
| 3310 | HMNE | HALFMOON EXPRESS INC | | | SCAC4 |
| 3311 | HMNG | HARMON TRUCKING | | | SCAC1 |
| 3312 | HMNH | INTERMARINE CARRIER | | | SCAC1 |
| 3313 | HMNH | HOLMAN SHIPPING INC | | | SCAC4 |
| 3314 | HMNI | HENDERSON, M & N INC | | | SCAC4 |
| 3315 | HMNL | HARTMAN, LOREN T | | | SCAC4 |
| 3316 | HMNN | H & M TRANSPORTATION INC | | | SCAC4 |
| 3317 | HMNQ | HOMER MOVING & STORAGE CO INC | | | SCAC4 |
| 3318 | HMNT | HARMON MOTOR TRANSPORT | | | SCAC4 |
| 3319 | HMO | Helicopter Operations Mexico, . De R.L. de C.V. | Callsign: Heli-Corp, | MEX | AVCODES |
| 3320 | HMOA | HOME OIL & GAS COMPANY INC | | | SCAC4 |
| 3321 | HMOC | HOME OIL CO LLC | | | SCAC4 |
| 3322 | HMOE | HOLMES OIL LLC | | | SCAC4 |
| 3323 | HMOI | H MOVING & STORAGE INC | | | SCAC4 |
| 3324 | HMOL | HICKS MOTOR LINE INC | | | SCAC4 |
| 3325 | HMOS | HENDRICK MOTORSPORTS | | | SCAC4 |
| 3326 | HMOY | HOME OIL CO INC | | | SCAC4 |
| 3327 | HMP | Papair Terminal, S.A. | Callsign: Papair Terminal, | RH | AVCODES |
| 3328 | HMP | Papair Terminal | | | ICAO1 |
| 3329 | HMPC | HAMMONS PRODUCTS COMPANY | | | SCAC4 |
| 3330 | HMPD | HAMILTON PAPER BOX CO LTD | | | SCAC4 |
| 3331 | HMPF | HAMILTON PLASTIC FABRICATORS (1997) | | | SCAC4 |
| 3332 | HMPG | HAMPS TRUCKING | | | SCAC4 |
| 3333 | HMPK | HOMAY, PATRICK | | | SCAC4 |
| 3334 | HMPL | HAMPL TRANSPORTATION INCORPORATED | | | SCAC4 |
| 3335 | HMPM | HOMA PETROLEUM | | | SCAC4 |
| 3336 | HMPN | HAMPTON TRUCKING L L C | | | SCAC4 |
| 3337 | HMPO | HAMPTON FUEL INC | | | SCAC4 |
| 3338 | HMPP | HEMPEL TRANSPORTATION LLC | | | SCAC4 |
| 3339 | HMPQ | HIKE METAL PRODUCTS LIMITED | | | SCAC4 |
| 3340 | HMPT | HAMPTON ROADS MOVING & STORAGE (HAM | | | SCAC4 |
| 3341 | HMPU | HOYER GMBH | | D | BIC |
| 3342 | HMPX | Halstead Metal Products, Inc. | added 1/1966; 10/1966; eliminated 7/1969 | | NAKINA |
| 3343 | HMPX | National Car Co. | 1/1945-4/1947 | | NAKINA |
| 3344 | HMPX | Halstead Metal Products, Inc. | added 1/66; 10/66; eliminated 7/69 | | NRHS |
| 3345 | HMPX | *NATIONAL CAR CO. | | | PWRC |
| 3346 | HMPX | *HALSTEAD METAL PRODUCTS, INC. | | | PWRC |
| 3347 | HMPY | HUMPHRYS TEXTILE PRODUCTS | | | SCAC4 |
| 3348 | HMR | North American Charters | Callsign: Hammer, | CDN | AVCODES |
| 3349 | HMR | Global Reach Aviation A/S | Callsign: Hammer, | DK | AVCODES |
| 3350 | HMR | North American Charters | | | ICAO1 |
| 3351 | HMR | Hoboken Manufacturers | 1/1980-7/2005 | | NAKINA |
| 3352 | HMR | Hoboken Manufacturers | 1/80-7/2000 | | NRHS |
| 3353 | HMR | *HUNTSVILLE MADISON COUNTY RAILROAD AUTHORITY | | | PWRC |
| 3354 | HMR | +HOBOKEN MANUFACTURERS RR. | | | PWRC |
| 3355 | HMR | Hoboken Manufacturers | | | RSRV |
| 3356 | HMRA | HATCHER, M R | | | SCAC4 |
| 3357 | HMRC | HAMRAC TRUCKING | | | SCAC4 |
| 3358 | HMRK | HAMME | | | SCAC4 |
| 3359 | HMRL | HAMPTON ROADS LEASING INC | | | SCAC4 |
| 3360 | HMRM | HAMERS | | | SCAC4 |
| 3361 | HMRN | HANSEN, MARVIN | | | SCAC4 |
| 3362 | HMRO | HIND MOTORS INC | | | SCAC4 |
| 3363 | HMRQ | HANSEN, MICHAEL R INC | | | SCAC4 |
| 3364 | HMRR | HUMMER VENTURES LTD | | | SCAC4 |
| 3365 | HMRU | HYUNDAI MOTORSPORT GMBH | | D | BIC |
| 3366 | HMRV | HENRY MARINE SERVICE INC | | | SCAC4 |
| 3367 | HMS | Hemus Air | IATA: DU, Callsign: Hemus Air, IATA Prefix: 748, Merged into Bulgaria Air FB/LZB in 2010 | BG | AVCODES |
| 3368 | HMS | Hemus Air | IATA: DU | | ICAO1 |
| 3369 | HMS | Royal (british) Navy | | GB | TRAFFIC |
| 3370 | HMSC | HARMS TRUCKING INC | | | SCAC4 |
| 3371 | HMSD | HALL MOTOR SPORTS | | | SCAC4 |
| 3372 | HMSE | H M S EXPRESS INC | | | SCAC4 |
| 3373 | HMSF | HAROLD MAINTENANCE SERVICE INC | | | SCAC4 |
| 3374 | HMSH | HS MEDEA SHIPPING COMPANY LTD | | | SCAC4 |
| 3375 | HMSJ | HMS TRANSPORT LLC | | | SCAC4 |
| 3376 | HMSK | HERCULES MOVING SYSTEMS INC | | | SCAC4 |
| 3377 | HMSM | HUMBOLDT STORAGE AND MOVING COMPANY | | | SCAC4 |
| 3378 | HMSN | HANSEATIC MOVING SERVICES LLC | | | SCAC4 |
| 3379 | HMSQ | HITCO MOVING & STORAGE SERVICE | | | SCAC4 |
| 3380 | HMSR | HMS INTEGRATED MANAGEMENT SYSTEMS L | | | SCAC4 |
| 3381 | HMSU | MED LOGISTICS (MALTA) LTD | | M | BIC |
| 3382 | HMSU | MED SERVICES SHIPPING LTD | | | SCAC4 |
| 3383 | HMSV | HOME SERVICE OIL COMPANY | | | SCAC4 |
| 3384 | HMSY | HORIZON MOVING SYSTEMS INC | | | SCAC4 |
| 3385 | HMT | Air Nova | Callsign: Hamilton, Ceased operations. | GB | AVCODES |
| 3386 | HMT | Hemet Exploration | | F | AVCODES |
| 3387 | HMT | Air Nova | | | ICAO1 |
| 3388 | HMTA | HIGH MOUNTAIN TRANSPORT LLC | | | SCAC4 |
| 3389 | HMTC | HAMMOND TRANSFER COMPANY INC | | | SCAC4 |
| 3390 | HMTE | HOMETOWNE ENERGY | | | SCAC4 |
| 3391 | HMTF | HOMETOWN EXPRESS FUEL CORP | | | SCAC4 |
| 3392 | HMTG | HENNINGS, MATT TRUCKING | | | SCAC4 |
| 3393 | HMTH | HARBOR MOTOR TRANS INC | | | SCAC4 |
| 3394 | HMTI | HAZARDOUS MATERIAL TRANSPORTATION I | | | SCAC4 |
| 3395 | HMTJ | H AND M TERMINAL TRANSPORT, INC | | | SCAC1 |
| 3396 | HMTJ | HOT MIX TRANSPORTS INC | | | SCAC4 |
| 3397 | HMTK | HARWELL, MARK TRUCKING LLC | | | SCAC4 |
| 3398 | HMTL | HARMONY TRANSPORT LTD | | | SCAC4 |
| 3399 | HMTM | HOMETOWN MOVING CO | | | SCAC4 |
| 3400 | HMTP | H & M TRANSPORTATION | | | SCAC4 |
