| 3501 | HPIC | HOLDEN PRODUCE INC | SCAC4 | ||
| 3502 | HPIE | HIGHWAY PIPELINE INC | SCAC4 | ||
| 3503 | HPIT | HEAVY PARTS INTERNATIONAL | SCAC4 | ||
| 3504 | HPIX | Basell U.S.A., Inc. | added 1/2001; 7/2005 | NAKINA | |
| 3505 | HPIX | Montell U.S.A., Inc. | added 4/1996; 7/2000; eliminated 1/2001 | NAKINA | |
| 3506 | HPIX | Himont U.S.A., Inc. | added 1/1984; 1/1994; eliminated 4/1996 | NAKINA | |
| 3507 | HPIX | Himont U.S.A., Inc. | 1/94; eliminated 4/96 | NRHS | |
| 3508 | HPIX | Montell U.S.A., Inc. | added 4/96; 7/2000; eliminated 1/2001 | NRHS | |
| 3509 | HPIX | Basell U.S.A., Inc. | added 1/2001 | NRHS | |
| 3510 | HPIX | BESELL USA, INC. [MONTELL USA INC.; HIMONT USA, INC.} | PWRC | ||
| 3511 | HPIX | HIMONT USA (Besell USA) | RSRV | ||
| 3512 | HPIX | BASELL USA INC | SCAC4 | ||
| 3513 | HPJ | Hop-A-Jet | ICAO1 | ||
| 3514 | HPJX | Helm-Pacific Leasing | 7/2000-7/2005 | NAKINA | |
| 3515 | HPJX | HELM Financial Corp. | eliminated 10/1994 | NAKINA | |
| 3516 | HPJX | Helm-Pacific Leasing | added 7/1993; 1/1994 | NAKINA | |
| 3517 | HPJX | Helm-Pacific Leasing | added 7/93; 1/94 | NRHS | |
| 3518 | HPJX | HELM Financial Corp. | eliminated 10/94 | NRHS | |
| 3519 | HPJX | Helm-Pacific Leasing | Jul-00 | NRHS | |
| 3520 | HPJX | HELM-PACIFIC LEASING | PWRC | ||
| 3521 | HPJX | Helm-Pacific Leasing | RSRV | ||
| 3522 | HPJX | HELM-PACIFIC LEASING | SCAC4 | ||
| 3523 | HPKI | HOPKINS TRANSPORTS INC | SCAC4 | ||
| 3524 | HPKL | HPK LOGISTICS (USA) INC | SCAC4 | ||
| 3525 | HPKO | HOPKINS OIL CO INC | SCAC4 | ||
| 3526 | HPKR | HP TRUCKING LLC | SCAC4 | ||
| 3527 | HPKW | HP TRUCKING OF IOWA | SCAC4 | ||
| 3528 | HPKX | National Car Co. | 4/1947 | NAKINA | |
| 3529 | HPKX | Hauser Packing Co. | 7/1923 | NAKINA | |
| 3530 | HPKX | *HAUSER PACKING CO. | PWRC | ||
| 3531 | HPKX | *NATIONAL CAR CO. | PWRC | ||
| 3532 | HPL | Heliportugal | ICAO1 | ||
| 3533 | HPLC | HALL TRANSPORTATION LLC | SCAC4 | ||
| 3534 | HPLD | HURON PRODUCE LTD | SCAC4 | ||
| 3535 | HPLF | HIGHLAND PROJECTS LLC | SCAC4 | ||
| 3536 | HPLG | HELP LOGISTICS INC | SCAC4 | ||
| 3537 | HPLH | HOLE PRODUCTIONS LTD, THE | SCAC4 | ||
| 3538 | HPLI | HI-PLAINS LEASING INC | SCAC4 | ||
| 3539 | HPLL | HOMEFIRE PREST LOGS LTD | SCAC4 | ||
| 3540 | HPLM | HOPE LINE LOGISTICS LLC | SCAC4 | ||
| 3541 | HPLO | HOOPS LOGISTICS LLC | SCAC4 | ||
| 3542 | HPLQ | HIGH POINT LOGISTICS INC | SCAC4 | ||
| 3543 | HPLS | HIGH PLAINS LOWBED SERVICE | SCAC4 | ||
| 3544 | HPLT | HIGH PLAINS OUTFITTERS | SCAC4 | ||
| 3545 | HPLX | Exxon Mobil Corp. | added 7/2000; 7/2005 | NAKINA | |
| 3546 | HPLX | Exxon Co., U.S.A. | added 1/1977; 1/1980; 1/1994; eliminated 7/2000 | NAKINA | |
| 3547 | HPLX | Exxon Pipeline Co. | added 1/1973; 1/1975; eliminated 1/1977 | NAKINA | |
| 3548 | HPLX | Humble Pipe Line Co. | added 1/1967; 4/1970; eliminated 1/1973 | NAKINA | |
| 3549 | HPLX | Hyman Pickle Co. | 7/1923 | NAKINA | |
| 3550 | HPLX | Humble Pipe Line Co. | added 1/67; 4/70 | NRHS | |
| 3551 | HPLX | Exxon Pipeline Co. | 1/75; eliminated 1/77 | NRHS | |
| 3552 | HPLX | Exxon Co., U.S.A. | added 1/77; 1/80; 1/94; eliminated 7/2000 | NRHS | |
| 3553 | HPLX | Exxon Mobil Corp. | added 7/2000 | NRHS | |
| 3554 | HPLX | *HYMAN PICKLE CO. | PWRC | ||
| 3555 | HPLX | +EXXON-MOBIL CORP. [EXXON USA CORP.; EXXON PIPELINE CO.; HUMBLE PIPE LINE CO.] | PWRC | ||
| 3556 | HPLX | Humble Pipe Line (Exxon-Mobil Corporation) | RSRV | ||
| 3557 | HPLX | EXXON MOBIL CORPORATION | SCAC4 | ||
| 3558 | HPLY | HEMPERLEY TRANSPORTATION SERVICES I | SCAC4 | ||
| 3559 | HPMI | HAUPTMANN TRUCKING INC | SCAC4 | ||
| 3560 | HPMR | Highland Pacific | Modell railroad | USA | TRAFFIC |
| 3561 | HPMS | HIGHLANDER POULTRY & MEATS OF TEXAS | SCAC4 | ||
| 3562 | HPMT | HARPER MARITIME E N E | SCAC4 | ||
| 3563 | HPNK | HIGH PLAINS TRUCKING LLC | SCAC4 | ||
| 3564 | HPNO | HEDEFINE PIANO SERVICE | SCAC4 | ||
| 3565 | HPO | Almiron Aviation | ICAO1 | ||
| 3566 | HPOC | HOBBS PURNELL OIL CO INC | SCAC4 | ||
| 3567 | HPOD | HAMPEL OIL DISTRIBUTORS INC | SCAC4 | ||
| 3568 | HPOQ | HOPSON OIL COMPANY INC | SCAC4 | ||
| 3569 | HPOX | Hansen Packing Co. | 7/1935-4/1938 | NAKINA | |
| 3570 | HPOX | Hansen Packing Co. | Apr-38 | NRHS | |
| 3571 | HPOX | HANSEN PACKING CO. | PWRC | ||
| 3572 | HPPI | HARVEST PAC PRODUCTS INC | SCAC4 | ||
| 3573 | HPPO | HELMS PETROLEUM | SCAC4 | ||
| 3574 | HPPP | HUGHES PETROLEUM PRODUCTS INC | SCAC4 | ||
| 3575 | HPPT | HAPPY TIME TOURS (THUNDER BAY) LIMI | SCAC4 | ||
| 3576 | HPPX | Flint Hills Resources LP | added 1/2009 | NAKINA | |
| 3577 | HPPX | Huntsman LLC | added 4/2003; 7/2005; eliminated 1/2009 | NAKINA | |
| 3578 | HPPX | Huntsman Polypropylene Corp. | eliminated 4/2003 | NAKINA | |
| 3579 | HPPX | Huntsman Polymers Corp. | added 7/2002 | NAKINA | |
| 3580 | HPPX | Huntsman Corp. | added 4/2002 | NAKINA | |
| 3581 | HPPX | Huntsman Polypropylene Corp. | added 4/1988; 1/1994-7/2000; eliminated 4/2002 | NAKINA | |
| 3582 | HPPX | Huntsman Polypropylene Corp. | added 4/88; 1/94-7/2000 | NRHS | |
| 3583 | HPPX | HUNTSMAN LLC (HUNTSMAN POLYPROPYLENE CORPORATION) | PWRC | ||
| 3584 | HPPX | Huntsman Polypropylene Corporation | RSRV | ||
| 3585 | HPPX | HUNTSMAN LLC | SCAC4 | ||
| 3586 | HPPY | HAPPY TRAVELERS TOURS | SCAC4 | ||
| 3587 | HPPZ | HAYWOOD POWER PLANT | PWRC | ||
| 3588 | HPR | Rick Lucas Helicopters | ICAO1 | ||
| 3589 | HPRA | HOOPER, ROB ART | SCAC4 | ||
| 3590 | HPRN | HEPTA RUN INC | SCAC4 | ||
| 3591 | HPRO | HARTLEY PRODUCE | SCAC4 | ||
| 3592 | HPRQ | HARPER TRANSFER & STORAGE INC | SCAC4 | ||
| 3593 | HPRS | HENRIKSEN, PER STABLE | SCAC4 | ||
| 3594 | HPRX | Hickok Producing Co. (General American Tank Car Corp.) | 8/1920-7/1923 | NAKINA | |
| 3595 | HPRX | HICKOK PRODUCING CO. (GENERAL AMERICAN TANK CAR CO.) | PWRC | ||
| 3596 | HPS | Horizon Plus | ICAO1 | ||
| 3597 | HPSA | HENRYS POOLS & SPAS | SCAC4 | ||
| 3598 | HPSD | HANEY POTTERY SALES LTD | SCAC4 | ||
| 3599 | HPSE | HOOPS ENTERPRISES INC | SCAC4 | ||
| 3600 | HPSL | HELICAL PIER SYSTEMS LTD | SCAC4 |