| 1 | HP | America West Airlines, Inc. | ICAO: AWE, Callsign: Cactus, IATA Prefix: 401, Merged into US Airways, Inc. January 2006. ICAO callsign changed form America West | USA | AVCODES |
| 2 | HP | Phoenix Airways Ltd. | Callsign: Phoenix, | CH | AVCODES |
| 3 | HP | Pearl Airways Compagne Haitienne | ICAO: HPA, Callsign: Pearl Airways, Designator HP recalled by IATA | RH | AVCODES |
| 4 | HP | Amapola Flyg AB | ICAO: APF, Callsign: Amapola, IATA designator changed from 7P | S | AVCODES |
| 5 | HP | H.S. Aviation Co. Ltd | ICAO: HSN, Callsign: Jaguar, | T | AVCODES |
| 6 | HP | Hjørring Privatbaner | 1939 - 2001 | DK | jernbanen.dk |
| 7 | HP | Hjørring Privatbaner | 1939 - 2001 | DK | TRAFFIC |
| 8 | HPA | Pearl Airways Compagne Haitienne | Callsign: Pearl Airways, Designator HP recalled by IATA | RH | AVCODES |
| 9 | HPA | Pearl Airways Compagne Haitienne | IATA: HP, Callsign: Pearl Airways, Designator HP recalled by IATA | RH | AVCODES |
| 10 | HPA | Pearl Airways | IATA: HP | | ICAO1 |
| 11 | HPAM | HPA MOTORSPORTS INC | | | SCAC4 |
| 12 | HPAO | HAHN, PAUL & CO | | | SCAC4 |
| 13 | HPAR | HASSON, PATRICK | | | SCAC4 |
| 14 | HPAT | HPA TRANSPORT LLC | | | SCAC4 |
| 15 | HPAU | HIDROJEN PEROKSIT AS | | TR | BIC |
| 16 | HPAU | HIDROJEN PEROKSIT | | | SCAC4 |
| 17 | HPAX | International Paper Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 18 | HPAX | Hammermill Paper Co. | added 1/1971; 1/1975-1/1980; eliminated 1/1992 | | NAKINA |
| 19 | HPAX | Mather Stock Car Co. | 1/1950-1/1952 | | NAKINA |
| 20 | HPAX | Hunter Packing Co. (Mather Stock Car Co.) | 1/1941-4/1947 | | NAKINA |
| 21 | HPAX | Hunter Packing Co. | 7/1932-4/1938 | | NAKINA |
| 22 | HPAX | Hunter Packing Co. (Mather Stock Car Co.) | Apr-38 | | NRHS |
| 23 | HPAX | Mather Stock Car Co. | Jan-52 | | NRHS |
| 24 | HPAX | Hammermill Paper Co. | added 1/71; 1/75-1/80; eliminated 1/92 | | NRHS |
| 25 | HPAX | International Paper Co. | added 1/92; 1/94-7/2000 | | NRHS |
| 26 | HPAX | *MATHER STOCK CAR CO. [HUNTER PACKING CO.] | | | PWRC |
| 27 | HPAX | +(IPCX) INTERNATIONAL PAPER COMPANY (HAMMERMILL) | | | PWRC |
| 28 | HPAX | Hammermill Paper (International Paper) | | | RSRV |
| 29 | HPAX | INTERNATIONAL PAPER COMPANY | | | SCAC4 |
| 30 | HPCC | HOPE CANDLE CO LTD | | | SCAC4 |
| 31 | HPCD | Hupac Deutschland | | DE | VKM |
| 32 | HPCN | HOSEPOWER CANADA | | | SCAC4 |
| 33 | HPCO | HARPER TRUCKING COMPANY, INC | | | SCAC1 |
| 34 | HPCO | HAMPTON COMPANY INC | | | SCAC4 |
| 35 | HPCP | HEAVENER SUPPLY INC | | | SCAC4 |
| 36 | HPCS | HIGH PLAINS COOPERATIVE | | | SCAC4 |
| 37 | HPCT | HOPKINS SERVICES LTD | | | SCAC4 |
| 38 | HPCU | HUIZHOU SINGAMAS ENERGY EQUIPMENT CO,LTD. | | PRC | BIC |
| 39 | HPCX | Hercules Inc. | added 7/1966; 10/1966-7/2000; eliminated 4/2002; 7/2005 (not listed); added 10/2005 | | NAKINA |
| 40 | HPCX | Hercules Powder Co., Inc. | 7/1923-7/1965; eliminated 7/1966 | | NAKINA |
| 41 | HPCX | Hercules Powder Co. | 8/1920 | | NAKINA |
| 42 | HPCX | Hercules Powder Co., Inc. | 4/38-7/65; eliminated 7/66 | | NRHS |
| 43 | HPCX | HERCULES,INC.{HERCULES POWDER CO.] | | | PWRC |
| 44 | HPCX | Hercules | | | RSRV |
| 45 | HPCX | ASHLAND INC | | | SCAC4 |
| 46 | HPCY | HOLSUM PRODUCE COMPANY INC | | | SCAC4 |
| 47 | HPCZ | HOLLAND PAVING CO. | | | PWRC |
| 48 | HPDB | HARBOUR PRINTING & DISTRIBUTION | | | SCAC4 |
| 49 | HPDD | HUNT, J B TRANSPORT INC (PENNINGTON | | | SCAC4 |
| 50 | HPDG | HIFAB TRANSPORT | | | SCAC4 |
| 51 | HPDL | HIGHLINE PRODUCE LIMITED | | | SCAC4 |
| 52 | HPDM | HOSE POWER DE MEXICO S DE RL | | | SCAC4 |
| 53 | HPDN | HONDA PERFORMANCE DEVELOPMENT INC | | | SCAC4 |
| 54 | HPDP | H P DISTRIBUTION LLP | | | SCAC4 |
| 55 | HPDS | HOOPER TRANSPORTATION | | | SCAC4 |
| 56 | HPDX | Hartol Terminal Corp. | 7/1935 | | NAKINA |
| 57 | HPDX | Hartol Products Corp. | 7/1930-7/1932 | | NAKINA |
| 58 | HPDX | HARTOL PRODUCTS CORP. | | | PWRC |
| 59 | HPE | Imperative Products | Callsign: Hope air, | USA | AVCODES |
| 60 | HPEAK | High Peak Buses | | GB | TRAFFIC |
| 61 | HPEC | HIGHLANDS PETROLEUM OIL CORP | | | SCAC4 |
| 62 | HPEF | HURRICANE PERFORMANCE | | | SCAC4 |
| 63 | HPEI | HILL PETROLEUM INC | | | SCAC4 |
| 64 | HPEL | HAMPEL OIL INC | | | SCAC4 |
| 65 | HPEN | HPE TRANSPORTATION | | | SCAC4 |
| 66 | HPET | HARPER TRANSPORT, INC | | | SCAC1 |
| 67 | HPEU | BECKER MARINE SYSTEMS GMBH & CO | | D | BIC |
| 68 | HPEX | Henderson Produce Co. | 7/1935 | | NAKINA |
| 69 | HPEZ | HOUSE PUBLIC ELEVATOR | | | PWRC |
| 70 | HPFC | HARBOR POINT FUEL SERVICE | | | SCAC4 |
| 71 | HPFE | HERNANDEZ PUENTE, FELIPE (MX-628629 | | | SCAC4 |
| 72 | HPFS | HOSPIRA FLEET SERVICES LLC | | | SCAC4 |
| 73 | HPFU | H & P FREIGHTWAYS LIMITED | | GB | BIC |
| 74 | HPGC | HAPAG-LLOYD CONTAINER LINE GMBH | | | SCAC4 |
| 75 | HPGO | HIPPO STORAGE TO-GO | | | SCAC4 |
| 76 | HPGS | HEPNER, GEORGE & SON TRUCKING COMPA | | | SCAC4 |
| 77 | HPGU | TIANJIN SINO-PEAK INTERNATIONAL TRADE CO LTD | | PRC | BIC |
| 78 | HPGU | TIANJIN SINO-PEAK INTERNATIONAL TRA | | | SCAC4 |
| 79 | HPHF | HAROLDSONS POLLED HEREFORDS | | | SCAC4 |
| 80 | HPHI | HOPPERS HAULING INC | | | SCAC4 |
| 81 | HPHX | H.P. Hood & Sons, Inc. | 1/1941-1/1946 | | NAKINA |
| 82 | HPHX | H.P. HOOD & SONS, INC. | | | PWRC |
| 83 | HPIA | HAPPY EXPRESS INC | | | SCAC4 |
| 84 | HPIC | HOLDEN PRODUCE INC | | | SCAC4 |
| 85 | HPIE | HIGHWAY PIPELINE INC | | | SCAC4 |
| 86 | HPIT | HEAVY PARTS INTERNATIONAL | | | SCAC4 |
| 87 | HPIU | CMC MATERIALS ITALIA SRL | | I | BIC |
| 88 | HPIX | Basell U.S.A., Inc. | added 1/2001; 7/2005 | | NAKINA |
| 89 | HPIX | Montell U.S.A., Inc. | added 4/1996; 7/2000; eliminated 1/2001 | | NAKINA |
| 90 | HPIX | Himont U.S.A., Inc. | added 1/1984; 1/1994; eliminated 4/1996 | | NAKINA |
| 91 | HPIX | Himont U.S.A., Inc. | 1/94; eliminated 4/96 | | NRHS |
| 92 | HPIX | Montell U.S.A., Inc. | added 4/96; 7/2000; eliminated 1/2001 | | NRHS |
| 93 | HPIX | Basell U.S.A., Inc. | added 1/2001 | | NRHS |
| 94 | HPIX | BESELL USA, INC. [MONTELL USA INC.; HIMONT USA, INC.} | | | PWRC |
| 95 | HPIX | HIMONT USA (Besell USA) | | | RSRV |
| 96 | HPIX | BASELL USA INC | | | SCAC4 |
| 97 | HPJ | Hop-A-Jet, Inc. | Callsign: Hopa-Jet, | USA | AVCODES |
| 98 | HPJ | Hop-A-Jet | | | ICAO1 |
| 99 | HPJU | HUAI'AN PORT LOGISTICS GROUP CO.,LTD. | | PRC | BIC |
| 100 | HPJX | Helm-Pacific Leasing | 7/2000-7/2005 | | NAKINA |
