| 4101 | HPJX | HELM-PACIFIC LEASING | | | SCAC4 |
| 4102 | HPK | Hopscotch Air, Inc. | IATA: O2, Callsign: Hopscotch Air, | USA | AVCODES |
| 4103 | HPKI | HOPKINS TRANSPORTS INC | | | SCAC4 |
| 4104 | HPKL | HPK LOGISTICS (USA) INC | | | SCAC4 |
| 4105 | HPKO | HOPKINS OIL CO INC | | | SCAC4 |
| 4106 | HPKR | HP TRUCKING LLC | | | SCAC4 |
| 4107 | HPKW | HP TRUCKING OF IOWA | | | SCAC4 |
| 4108 | HPKX | National Car Co. | 4/1947 | | NAKINA |
| 4109 | HPKX | Hauser Packing Co. | 7/1923 | | NAKINA |
| 4110 | HPKX | *HAUSER PACKING CO. | | | PWRC |
| 4111 | HPKX | *NATIONAL CAR CO. | | | PWRC |
| 4112 | HPL | Heliportugal | | | ICAO1 |
| 4113 | HPLC | HALL TRANSPORTATION LLC | | | SCAC4 |
| 4114 | HPLD | HURON PRODUCE LTD | | | SCAC4 |
| 4115 | HPLF | HIGHLAND PROJECTS LLC | | | SCAC4 |
| 4116 | HPLG | HELP LOGISTICS INC | | | SCAC4 |
| 4117 | HPLH | HOLE PRODUCTIONS LTD, THE | | | SCAC4 |
| 4118 | HPLI | HI-PLAINS LEASING INC | | | SCAC4 |
| 4119 | HPLL | HOMEFIRE PREST LOGS LTD | | | SCAC4 |
| 4120 | HPLM | HOPE LINE LOGISTICS LLC | | | SCAC4 |
| 4121 | HPLO | HOOPS LOGISTICS LLC | | | SCAC4 |
| 4122 | HPLQ | HIGH POINT LOGISTICS INC | | | SCAC4 |
| 4123 | HPLS | HIGH PLAINS LOWBED SERVICE | | | SCAC4 |
| 4124 | HPLT | HIGH PLAINS OUTFITTERS | | | SCAC4 |
| 4125 | HPLX | Exxon Mobil Corp. | added 7/2000; 7/2005 | | NAKINA |
| 4126 | HPLX | Exxon Co., U.S.A. | added 1/1977; 1/1980; 1/1994; eliminated 7/2000 | | NAKINA |
| 4127 | HPLX | Exxon Pipeline Co. | added 1/1973; 1/1975; eliminated 1/1977 | | NAKINA |
| 4128 | HPLX | Humble Pipe Line Co. | added 1/1967; 4/1970; eliminated 1/1973 | | NAKINA |
| 4129 | HPLX | Hyman Pickle Co. | 7/1923 | | NAKINA |
| 4130 | HPLX | Humble Pipe Line Co. | added 1/67; 4/70 | | NRHS |
| 4131 | HPLX | Exxon Pipeline Co. | 1/75; eliminated 1/77 | | NRHS |
| 4132 | HPLX | Exxon Co., U.S.A. | added 1/77; 1/80; 1/94; eliminated 7/2000 | | NRHS |
| 4133 | HPLX | Exxon Mobil Corp. | added 7/2000 | | NRHS |
| 4134 | HPLX | *HYMAN PICKLE CO. | | | PWRC |
| 4135 | HPLX | +EXXON-MOBIL CORP. [EXXON USA CORP.; EXXON PIPELINE CO.; HUMBLE PIPE LINE CO.] | | | PWRC |
| 4136 | HPLX | Humble Pipe Line (Exxon-Mobil Corporation) | | | RSRV |
| 4137 | HPLX | EXXON MOBIL CORPORATION | | | SCAC4 |
| 4138 | HPLY | HEMPERLEY TRANSPORTATION SERVICES I | | | SCAC4 |
| 4139 | HPMI | HAUPTMANN TRUCKING INC | | | SCAC4 |
| 4140 | HPMR | Highland Pacific | Modell railroad | USA | TRAFFIC |
| 4141 | HPMS | HIGHLANDER POULTRY & MEATS OF TEXAS | | | SCAC4 |
| 4142 | HPMT | HARPER MARITIME E N E | | | SCAC4 |
| 4143 | HPN | Airdialog, LLC d/b/a Linear Air | Callsign: Harpoon, Name changed to Air Taxi Service and Support LLC, d/b/a Linear Air. | USA | AVCODES |
| 4144 | HPN | Air Taxi Service and Support LLC, d/b/a Linear Air. | Callsign: Harpoon, Name changed to AirDialog. Name changed from Airdialog, LLC d/b/a Linear Air. Subsidiary of AirDialog LLC | USA | AVCODES |
| 4145 | HPN | AirDialog | Callsign: Harpoon, Name changed from Air Taxi Service and Support LLC, d/b/a Linear Air and previously changed from Airdialog, LLC d/b/a Linear Air. | USA | AVCODES |
| 4146 | HPNK | HIGH PLAINS TRUCKING LLC | | | SCAC4 |
| 4147 | HPNO | HEDEFINE PIANO SERVICE | | | SCAC4 |
| 4148 | HPO | Almron Aviation Ltd | Callsign: Almron, | EAU | AVCODES |
| 4149 | HPO | Almiron Aviation | | | ICAO1 |
| 4150 | HPOC | HOBBS PURNELL OIL CO INC | | | SCAC4 |
| 4151 | HPOD | HAMPEL OIL DISTRIBUTORS INC | | | SCAC4 |
| 4152 | HPOQ | HOPSON OIL COMPANY INC | | | SCAC4 |
| 4153 | HPOX | Hansen Packing Co. | 7/1935-4/1938 | | NAKINA |
| 4154 | HPOX | Hansen Packing Co. | Apr-38 | | NRHS |
| 4155 | HPOX | HANSEN PACKING CO. | | | PWRC |
| 4156 | HPP | Aviation Partner of Boynton Beach, LLC d/b/a Sky Atlantic US | Callsign: Sky Hop, | USA | AVCODES |
| 4157 | HPPI | HARVEST PAC PRODUCTS INC | | | SCAC4 |
| 4158 | HPPO | HELMS PETROLEUM | | | SCAC4 |
| 4159 | HPPP | HUGHES PETROLEUM PRODUCTS INC | | | SCAC4 |
| 4160 | HPPT | HAPPY TIME TOURS (THUNDER BAY) LIMI | | | SCAC4 |
| 4161 | HPPU | HOA PHAT CONTAINER PRODUCTION JSC. | | VN | BIC |
| 4162 | HPPX | Flint Hills Resources LP | added 1/2009 | | NAKINA |
| 4163 | HPPX | Huntsman LLC | added 4/2003; 7/2005; eliminated 1/2009 | | NAKINA |
| 4164 | HPPX | Huntsman Polypropylene Corp. | eliminated 4/2003 | | NAKINA |
| 4165 | HPPX | Huntsman Polymers Corp. | added 7/2002 | | NAKINA |
| 4166 | HPPX | Huntsman Corp. | added 4/2002 | | NAKINA |
| 4167 | HPPX | Huntsman Polypropylene Corp. | added 4/1988; 1/1994-7/2000; eliminated 4/2002 | | NAKINA |
| 4168 | HPPX | Huntsman Polypropylene Corp. | added 4/88; 1/94-7/2000 | | NRHS |
| 4169 | HPPX | HUNTSMAN LLC (HUNTSMAN POLYPROPYLENE CORPORATION) | | | PWRC |
| 4170 | HPPX | Huntsman Polypropylene Corporation | | | RSRV |
| 4171 | HPPX | HUNTSMAN LLC | | | SCAC4 |
| 4172 | HPPY | HAPPY TRAVELERS TOURS | | | SCAC4 |
| 4173 | HPPZ | HAYWOOD POWER PLANT | | | PWRC |
| 4174 | HPR | Rick Lucas Helicopters Ltd. | Callsign: Helipro, | NZ | AVCODES |
| 4175 | HPR | Rick Lucas Helicopters | | | ICAO1 |
| 4176 | HPRA | HOOPER, ROB ART | | | SCAC4 |
| 4177 | HPRN | HEPTA RUN INC | | | SCAC4 |
| 4178 | HPRO | HARTLEY PRODUCE | | | SCAC4 |
| 4179 | HPRQ | HARPER TRANSFER & STORAGE INC | | | SCAC4 |
| 4180 | HPRS | HENRIKSEN, PER STABLE | | | SCAC4 |
| 4181 | HPRX | Hickok Producing Co. (General American Tank Car Corp.) | 8/1920-7/1923 | | NAKINA |
| 4182 | HPRX | HICKOK PRODUCING CO. (GENERAL AMERICAN TANK CAR CO.) | | | PWRC |
| 4183 | HPS | Crown Aviation, Inc. | Callsign: High Plains, | USA | AVCODES |
| 4184 | HPS | Horizon Plus | | | ICAO1 |
| 4185 | HPSA | HENRYS POOLS & SPAS | | | SCAC4 |
| 4186 | HPSD | HANEY POTTERY SALES LTD | | | SCAC4 |
| 4187 | HPSE | HOOPS ENTERPRISES INC | | | SCAC4 |
| 4188 | HPSL | HELICAL PIER SYSTEMS LTD | | | SCAC4 |
| 4189 | HPSM | HAWTHORNE POWER SYSTEMS | | | SCAC4 |
| 4190 | HPSP | HOLLOBAUGH, P S | | | SCAC4 |
| 4191 | HPSU | ALLIED CHINA INTERNATIONAL HOLDING | | | SCAC4 |
| 4192 | HPSX | H.P. Smith Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 4193 | HPSY | HEPTA SYSTEMS INC | | | SCAC4 |
| 4194 | HPT | Heli-pet | Callsign: Heli-Pet, Ceased operations. | UA | AVCODES |
| 4195 | HPTC | HAPPY TRUCKING CO INC | | | SCAC4 |
| 4196 | HPTD | High Point, Thomasville & Denton R.R. Co. | 1/1975-7/2005 | | NAKINA |
| 4197 | HPTD | High Point, Thomasville & Denton R.R. Co. | 1/75-7/2000 | | NRHS |
| 4198 | HPTD | HIGH POINT, THOMASVILLE & DENTON RAILROAD CO. | | | PWRC |
| 4199 | HPTD | High Point, Thomasville and Denton Railroad | | | RSRV |
| 4200 | HPTD | High Point, Thomasville & Denton R.R. Co. | | USA | TRAFFIC |
