| 4301 | HRCX | Heritage Railcar | 1/1994-7/2005 (not listed) | | NAKINA |
| 4302 | HRCX | Heritage Railcar | 1/94-7/2000 | | NRHS |
| 4303 | HRCX | HERITAGE RAILCAR | | | PWRC |
| 4304 | HRCX | Heritage Railcar | | | RSRV |
| 4305 | HRCX | HERITAGE RAILCAR | | | SCAC4 |
| 4306 | HRD | Marshall University Bill Noe Flight School | Callsign: Marshall Herd, | USA | AVCODES |
| 4307 | HRDD | HARTS RAPID DELIVERY | | | SCAC4 |
| 4308 | HRDE | H R DENTAL PRODUCTS INC | | | SCAC4 |
| 4309 | HRDF | HOT ROD TRUCKING SERVICES INC | | | SCAC4 |
| 4310 | HRDH | HAMMER, D TRUCKING INC | | | SCAC4 |
| 4311 | HRDK | HORD TRUCKING INC | | | SCAC4 |
| 4312 | HRDL | Hudson River Day Line | 1/1975-1/1980 | | NAKINA |
| 4313 | HRDL | Hudson River Day Line | 1/75-1/80 | | NRHS |
| 4314 | HRDL | HUDSON RIVER DAY LINE | | | PWRC |
| 4315 | HRDL | Hudson River Day Line | | | RSRV |
| 4316 | HRDM | HARDING METALS INC | | | SCAC4 |
| 4317 | HRDN | HARDIN TRUCKING INC | | | SCAC4 |
| 4318 | HRDR | HARRIS DISTRIBUTING COMPANY | | | SCAC4 |
| 4319 | HRDV | HERNANDEZ RIVAS, JULIAN ALONSO | | | SCAC4 |
| 4320 | HRDX | Silver Star Enterprises, Inc. | added 1/1994; 7/2000; eliminated 7/2004; 7/2005 (not listed) | | NAKINA |
| 4321 | HRDX | M-P Petroleum Ltd. | added 10/1975; eliminated 10/1978 | | NAKINA |
| 4322 | HRDX | Hagaman Refining Co. | 8/1920 | | NAKINA |
| 4323 | HRDX | Hydrocarbons Inc. | added 10/1974; 1/1975; eliminated 10/1975 | | NAKINA |
| 4324 | HRDX | Hydrocarbons Inc. | added 10/74; 1/75 | | NRHS |
| 4325 | HRDX | M-P Petroleum Ltd. | eliminated 10/78 | | NRHS |
| 4326 | HRDX | Silver Star Enterprises, Inc. | added 1/94; 7/2000 | | NRHS |
| 4327 | HRDX | *HAGAMAN REFINING CO. | | | PWRC |
| 4328 | HRDX | *M-P PETROLEUM LTD. [HYDROCARBONS, INC.] | | | PWRC |
| 4329 | HRDX | +SILVER STAR ENTERPRISES, INC. | | | PWRC |
| 4330 | HRDX | Hagaman Refining (Silver Star Enterprises) | | | RSRV |
| 4331 | HRE | FFH Sudwestdeutsche Verkehrsfliegerschule | Callsign: Hart Air, | D | AVCODES |
| 4332 | HREE | FIVE FIVE SEVEN | | | SCAC4 |
| 4333 | HREF | HARE FREIGHT SERVICES INC | | | SCAC4 |
| 4334 | HREI | HOUSTON RYDER EXPRESS INC | | | SCAC4 |
| 4335 | HREL | HARD ROCK ENTERPRISES LLC | | | SCAC4 |
| 4336 | HREM | HOLIDAY RETIREMENT | | | SCAC4 |
| 4337 | HREN | HERREN ENTERPRISES INC | | | SCAC4 |
| 4338 | HREO | HERRERA, | | | SCAC4 |
| 4339 | HREP | HERMITAGE EXPRESS | | | SCAC1 |
| 4340 | HREP | HILDABY RIDGE EXPRESS | | | SCAC4 |
| 4341 | HRET | HARRIS TRANSPORTATION COMPANY LLC | | | SCAC4 |
| 4342 | HREX | Heavy Railroad Excavations, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 4343 | HREX | Heavy Railroad Excavations, Inc. | Jul-00 | | NRHS |
| 4344 | HREX | HEAVY RAILROAD EXCAVATIONS INC | | | PWRC |
| 4345 | HREX | Heavy Railroad Excavations | | | RSRV |
| 4346 | HRF | Veterans Airlift Command | Callsign: Hero-Flight, | USA | AVCODES |
| 4347 | HRFD | HARRIS FEEDING CO | | | SCAC1 |
| 4348 | HRFO | HERFO A/S | | | SCAC4 |
| 4349 | HRFX | H.R. Farmer, owner, Farmer Tank Line | 1/1946-4/1947 | | NAKINA |
| 4350 | HRFX | H. R. FARMER (FARMER TANK LINES) | | | PWRC |
| 4351 | HRGC | HERITAGE ART EDITIONS INC | | | SCAC4 |
| 4352 | HRGI | HORNING, ROD TRUCKING INC | | | SCAC4 |
| 4353 | HRGK | HARRING, K L TRANSPORTATION LLC | | | SCAC4 |
| 4354 | HRGO | HERITAGE OIL INC | | | SCAC4 |
| 4355 | HRGS | HARGIS TRUCK LINES | | | SCAC1 |
| 4356 | HRGT | HARRINGTON TRUCKING LLC | | | SCAC4 |
| 4357 | HRH | Royal Tongan Airlines | IATA: WR, Callsign: Tonga Royal, IATA Prefix: 971, Ceased operatioins | TO | AVCODES |
| 4358 | HRH | Friendly Islands Airways Limited | IATA: JK, Callsign: Tonga Royal, | TO | AVCODES |
| 4359 | HRH | Royal Tongan Airlines | IATA: WR | | ICAO1 |
| 4360 | HRHF | HIRSCH FUELS INC | | | SCAC4 |
| 4361 | HRHJ | HUMMER, R H JR INC | | | SCAC4 |
| 4362 | HRHP | HANSEN, R H PROPERTIES LLC | | | SCAC4 |
| 4363 | HRI | Skraidybos Mokymo Centras | Callsign: Helirim, | LT | AVCODES |
| 4364 | HRI | Skyraidybos Mokymo Centras | | | ICAO1 |
| 4365 | HRIB | HRIBAR LOGISTICS LLC | | | SCAC4 |
| 4366 | HRID | HIGHWAY RIDERS | | | SCAC4 |
| 4367 | HRIG | HARRIS, RICHARD G | | | SCAC4 |
| 4368 | HRIK | HAMMOND, RICKY | | | SCAC4 |
| 4369 | HRIP | HRI INC | | | SCAC4 |
| 4370 | HRIT | HEAT RIGHT | | | SCAC4 |
| 4371 | HRIX | Merchants Despatch Transportation Corp. | added 10/1955; 10/1957-10/1966; eliminated 10/1969 | | NAKINA |
| 4372 | HRIX | Merchants Despatch Transportation Corp. | 10/57-10/66; eliminated 10/69 | | NRHS |
| 4373 | HRIX | MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 4374 | HRJB | H & R JACOBSEN INC | | | SCAC4 |
| 4375 | HRJC | HARROLD, E J INC | | | SCAC4 |
| 4376 | HRJI | H R J INC | | | SCAC4 |
| 4377 | HRJL | HUERTA ROMERO, JUAN CARLOS | | | SCAC4 |
| 4378 | HRJM | HILLS, RICHARD JAMES | | | SCAC4 |
| 4379 | HRJO | HERNANDEZ ROJAS, JUAN FRANCISCO | | | SCAC4 |
| 4380 | HRJS | HURTADO, JUAN JOSE | | | SCAC4 |
| 4381 | HRJY | HERMAN, JAY TRUCKING | | | SCAC4 |
| 4382 | HRK | Herik Rail | | NL | VKM |
| 4383 | HRKC | HRT TRUCKING INC | | | SCAC4 |
| 4384 | HRKG | HRT TRUCKING INC | | | SCAC4 |
| 4385 | HRKI | HIGH ROCKIES TRANSPORTATION | | | SCAC4 |
| 4386 | HRKM | HARKEM | | | SCAC4 |
| 4387 | HRKQ | HER TRUCKING INC | | | SCAC4 |
| 4388 | HRKS | HAMER TRUCKING INC | | | SCAC4 |
| 4389 | HRKV | HIGH STAR TRUCKING SERVICES | | | SCAC4 |
| 4390 | HRL | Commander Flugdienst GmbH | Callsign: Harley, | D | AVCODES |
| 4391 | HRL | Harsco Rail Limited | | UK | VKM |
| 4392 | HRLA | HOLT, ROYCE L | | | SCAC4 |
| 4393 | HRLB | H & R Lube Blending GmbH | | DE | VKM |
| 4394 | HRLC | HARLIN TRUCKING LLC | | | SCAC4 |
| 4395 | HRLE | HARRIS, LIONEL OIL CO INC | | | SCAC4 |
| 4396 | HRLF | HIGHCROFT RACING LTD | | | SCAC4 |
| 4397 | HRLG | HRL TRANSPORT LLC | | | SCAC4 |
| 4398 | HRLH | HARDY, LOUIS H TRUCK LINE | | | SCAC4 |
| 4399 | HRLI | HEERINGA, R L INC | | | SCAC4 |
| 4400 | HRLJ | HOLT, RICK TRUCKING LLC | | | SCAC4 |
