| 3601 | HPSM | HAWTHORNE POWER SYSTEMS | SCAC4 | ||
| 3602 | HPSP | HOLLOBAUGH, P S | SCAC4 | ||
| 3603 | HPSU | ALLIED CHINA INTERNATIONAL HOLDING | SCAC4 | ||
| 3604 | HPSX | H.P. Smith Co. (Merchants Despatch, Inc.) | 7/1935 | NAKINA | |
| 3605 | HPSY | HEPTA SYSTEMS INC | SCAC4 | ||
| 3606 | HPTC | HAPPY TRUCKING CO INC | SCAC4 | ||
| 3607 | HPTD | High Point, Thomasville & Denton R.R. Co. | 1/1975-7/2005 | NAKINA | |
| 3608 | HPTD | High Point, Thomasville & Denton R.R. Co. | 1/75-7/2000 | NRHS | |
| 3609 | HPTD | HIGH POINT, THOMASVILLE & DENTON RAILROAD CO. | PWRC | ||
| 3610 | HPTD | High Point, Thomasville and Denton Railroad | RSRV | ||
| 3611 | HPTD | High Point, Thomasville & Denton R.R. Co. | USA | TRAFFIC | |
| 3612 | HPTF | HIGH PERFORMANCE TRANSPORT AND SHIP | SCAC4 | ||
| 3613 | HPTG | HOFFMAN, PAUL TRUCKING INC | SCAC4 | ||
| 3614 | HPTI | HOPE TRUCKING INC | SCAC4 | ||
| 3615 | HPTJ | HIGH PLAINS TRUCKING LLC | SCAC4 | ||
| 3616 | HPTL | HIGH POOL TANKERS LIMITED | SCAC4 | ||
| 3617 | HPTN | HOOPERS TRUCKING LLC | SCAC4 | ||
| 3618 | HPTO | HULSEY PROPANE TRANSPORT INC | SCAC4 | ||
| 3619 | HPTP | HP TRANSPORT INC | SCAC4 | ||
| 3620 | HPTU | HIGHWAY PIPELINE | PWRC | ||
| 3621 | HPTU | Highway Pipeline | RSRV | ||
| 3622 | HPTX | Hellbron-Palmer Tank Line Co. | 7/1923 | NAKINA | |
| 3623 | HPTX | HELLBRON-PALMER TANK LINE CO. | PWRC | ||
| 3624 | HPUT | HEREM, PAUL TRUCKING | SCAC4 | ||
| 3625 | HPUZ | HOUSTON PUBLIC ELEVATOR | PWRC | ||
| 3626 | HPWN | HOFER, PAUL WAYNE | SCAC4 | ||
| 3627 | HPX | Houston Packing Co. | 8/1920-1/1952; eliminated 7/1953 | NAKINA | |
| 3628 | HPX | Houston Packing Co. | 4/38-1/52 | NRHS | |
| 3629 | HPX | HOUSTON PACKING CO. | PWRC | ||
| 3630 | HPXC | H P TRANSPORTATION INC | SCAC4 | ||
| 3631 | HPXL | HILLPOINT EXPRESS LLC | SCAC4 | ||
| 3632 | HPYW | HAPPY WORLD TRANSPORT | SCAC4 | ||
| 3633 | HQCN | HIGH QUALITY CONTAINERS TRANSPORT I | SCAC4 | ||
| 3634 | HQFT | HOLMES Q S T INC | SCAC4 | ||
| 3635 | HQID | HORIZON INTERNATIONAL DISTRIBUTORS | SCAC4 | ||
| 3636 | HQLQ | HYBRID LOGISTICS SOLUTIONS INC | SCAC4 | ||
| 3637 | HQLT | HART, L T INC | SCAC4 | ||
| 3638 | HQMT | HQ MARINE TRANSPORT INC | SCAC4 | ||
| 3639 | HQO | Avinor | ICAO1 | ||
| 3640 | HQOI | HICKMAN OIL & ICE CO INC | SCAC4 | ||
| 3641 | HQPC | HOOD PETROLEUM CO INC | SCAC4 | ||
| 3642 | HQSL | HEAVYQUIP SALES LTD | SCAC4 | ||
| 3643 | HQTA | HORN, QUINCE TRANSPORT | SCAC4 | ||
| 3644 | HQTL | HANNIBAL-QUINCY TRUCK LINES | PWRC | ||
| 3645 | HQUC | HYDRO-QUEBEC | SCAC4 | ||
| 3646 | HR | Heritage R.R. Corp. | added 1/2004; eliminated 7/2004; 7/2005 | NAKINA | |
| 3647 | HR | HERITAGE RAILROAD CORP. | PWRC | ||
| 3648 | HR | HERITAGE RAILROAD CORP | SCAC4 | ||
| 3649 | HRA | Heli-Iberica | ICAO1 | ||
| 3650 | HRAA | HAYNES TRANSPORT | SCAC4 | ||
| 3651 | HRAB | HARMAC REBAR & STEEL CORP | SCAC4 | ||
| 3652 | HRAC | HAMILTON, RAY, COMPANY, THE | SCAC1 | ||
| 3653 | HRAC | HAMILTON, RAY COMPANY, THE | SCAC4 | ||
| 3654 | HRAF | HESTER, R F | SCAC4 | ||
| 3655 | HRAI | HIERO, ARTISTICO S A DE C V | SCAC4 | ||
| 3656 | HRAIL | Eiffage Rail GmbH | DE | VKM | |
| 3657 | HRAJ | HRA | SCAC4 | ||
| 3658 | HRAK | HARKER RANCH | SCAC4 | ||
| 3659 | HRAN | HARRIS, J A TRUCKING | SCAC4 | ||
| 3660 | HRAO | HAMBURG RADIATOR AUTO & AIR | SCAC4 | ||
| 3661 | HRAR | HARVIE RANCHING | SCAC4 | ||
| 3662 | HRAY | HAND, RAY R | SCAC4 | ||
| 3663 | HRB | Haiti International Airline | ICAO1 | ||
| 3664 | HRBA | HARBOR AUTO TRANSPORT INC | SCAC4 | ||
| 3665 | HRBG | HARDWOOD EXPRESS INC | SCAC4 | ||
| 3666 | HRBK | HERRBOLDT TRUCKING | SCAC4 | ||
| 3667 | HRBL | H & R BALING COMPANY INC | SCAC4 | ||
| 3668 | HRBQ | HARRIS RANCH BEEF COMPANY | SCAC4 | ||
| 3669 | HRBR | HARBOR EXPRESS INC | SCAC4 | ||
| 3670 | HRBT | HARBOR TRANSPORT INC | SCAC4 | ||
| 3671 | HRC | HISTORICAL RAILROAD CARS | PWRC | ||
| 3672 | HRCA | HERCORP TRANSPORT INC | SCAC4 | ||
| 3673 | HRCB | HAMBURG REEFER CHARTERING GMBH | SCAC4 | ||
| 3674 | HRCD | HOT ROD CORNER PARTS AND ACCESSORIE | SCAC4 | ||
| 3675 | HRCF | HERCULES FORWARDING, INC | SCAC1 | ||
| 3676 | HRCF | HERCULES FORWARDING INC | SCAC4 | ||
| 3677 | HRCG | HARDIES FRUIT & VEGETABLE CO INC | SCAC4 | ||
| 3678 | HRCH | HAR-G TRANSPORT | SCAC4 | ||
| 3679 | HRCK | COOK, H R TRUCK LINE, INC | SCAC3 | ||
| 3680 | HRCO | HARCO CARRIERS INC | SCAC4 | ||
| 3681 | HRCS | HAMPTON ROADS CRANE & RIGGING COMPA | SCAC4 | ||
| 3682 | HRCU | CUBA RON S A | SCAC4 | ||
| 3683 | HRCX | Heritage Railcar | 1/1994-7/2005 (not listed) | NAKINA | |
| 3684 | HRCX | Heritage Railcar | 1/94-7/2000 | NRHS | |
| 3685 | HRCX | HERITAGE RAILCAR | PWRC | ||
| 3686 | HRCX | Heritage Railcar | RSRV | ||
| 3687 | HRCX | HERITAGE RAILCAR | SCAC4 | ||
| 3688 | HRDD | HARTS RAPID DELIVERY | SCAC4 | ||
| 3689 | HRDE | H R DENTAL PRODUCTS INC | SCAC4 | ||
| 3690 | HRDF | HOT ROD TRUCKING SERVICES INC | SCAC4 | ||
| 3691 | HRDH | HAMMER, D TRUCKING INC | SCAC4 | ||
| 3692 | HRDK | HORD TRUCKING INC | SCAC4 | ||
| 3693 | HRDL | Hudson River Day Line | 1/1975-1/1980 | NAKINA | |
| 3694 | HRDL | Hudson River Day Line | 1/75-1/80 | NRHS | |
| 3695 | HRDL | HUDSON RIVER DAY LINE | PWRC | ||
| 3696 | HRDL | Hudson River Day Line | RSRV | ||
| 3697 | HRDM | HARDING METALS INC | SCAC4 | ||
| 3698 | HRDN | HARDIN TRUCKING INC | SCAC4 | ||
| 3699 | HRDR | HARRIS DISTRIBUTING COMPANY | SCAC4 | ||
| 3700 | HRDV | HERNANDEZ RIVAS, JULIAN ALONSO | SCAC4 |