| 2501 | HLNF | HOT-LINE FREIGHT SYSTEM, INC | SCAC1 | ||
| 2502 | HLNF | HOT-LINE FREIGHT SYSTEM INC | SCAC4 | ||
| 2503 | HLNG | HAULING FREIGHT LINES INC | SCAC4 | ||
| 2504 | HLNN | HILL, LYNN TRUCKING | SCAC4 | ||
| 2505 | HLNP | HALTON ENTERPRISES | SCAC4 | ||
| 2506 | HLNS | HLN SERVICES LTD | SCAC4 | ||
| 2507 | HLNT | HAMMER LANE TRANSPORTATION | SCAC4 | ||
| 2508 | HLO | Samaritan Air Service | ICAO1 | ||
| 2509 | HLO | City: Hlohovec | SK | TRAFFIC | |
| 2510 | HLOB | HAUL LOGISTICS | SCAC4 | ||
| 2511 | HLOC | HNA LOGISTICS OF TEXAS LLC | SCAC4 | ||
| 2512 | HLOE | HORSE LIMO, THE | SCAC4 | ||
| 2513 | HLOG | HALBERSLEBEN LOGISTICS | SCAC4 | ||
| 2514 | HLOI | HTI LOGISTICS LLC | SCAC4 | ||
| 2515 | HLOJ | HEGO LOGISTICS | SCAC4 | ||
| 2516 | HLOL | HALLS OIL INC | SCAC4 | ||
| 2517 | HLOQ | HORSESENSE LOGISTICS | SCAC4 | ||
| 2518 | HLOR | HALL OIL CO INC | SCAC4 | ||
| 2519 | HLOS | HOMESTEAD LOGISTICS | SCAC4 | ||
| 2520 | HLOT | HOLTON TRANSPORT SERVICE INC | SCAC4 | ||
| 2521 | HLOV | HJT LOGISTICS | SCAC4 | ||
| 2522 | HLP | Helipistas | ICAO1 | ||
| 2523 | HLP | Traditionsgemeinschaft Bw Halle P e.V. | DE | VKM | |
| 2524 | HLPA | HALPIN TRUCKING | SCAC4 | ||
| 2525 | HLPG | HELLESPONT GRAND CORPORATION | SCAC4 | ||
| 2526 | HLPL | HILL PETROLEUM | SCAC4 | ||
| 2527 | HLPX | Otter Tail Power Co. | added 1/2005; 7/2005 | NAKINA | |
| 2528 | HLPX | Houston Lighting & Power Co. | 1/1950-1/1980; eliminated 5/1983 | NAKINA | |
| 2529 | HLPX | Houston Lighting & Power Co. | 1/52-1/80; eliminated 5/83 | NRHS | |
| 2530 | HLPX | *HOUSTON LIGHTING & POWER CO. | PWRC | ||
| 2531 | HLPX | +OTTER TAIL POWER CO. | PWRC | ||
| 2532 | HLPX | Houston Lighting and Power | RSRV | ||
| 2533 | HLPX | OTTER TAIL POWER CO | SCAC4 | ||
| 2534 | HLPY | TAR HEEL OIL II INCDBA HALL PETROLE | SCAC4 | ||
| 2535 | HLPZ | HOUSTON LIGHTING & POWER CO. | PWRC | ||
| 2536 | HLQ | Harlequin Air | J | TRAFFIC | |
| 2537 | HLQT | HELIQWEST AVIATION INC | SCAC4 | ||
| 2538 | HLR | Heli Air Services | ICAO1 | ||
| 2539 | HLRC | HUNT, L R TRUCKING | SCAC4 | ||
| 2540 | HLRD | HEWITT LIFTS & ROLL-A-DOCK | SCAC4 | ||
| 2541 | HLRG | HOLLIDAY, ROBERT G CHB | SCAC4 | ||
| 2542 | HLRK | H & L TRUCKING INC | SCAC4 | ||
| 2543 | HLRN | HALO ART INC | SCAC4 | ||
| 2544 | HLRQ | HALRON DISTRIBUTION LLC | SCAC4 | ||
| 2545 | HLRU | HANSA LEASING LTD | SCAC4 | ||
| 2546 | HLRZ | HOLROYD | PWRC | ||
| 2547 | HLS | Haiti Air Freight | ICAO1 | ||
| 2548 | HLSA | HALL SOLUTIONS | SCAC4 | ||
| 2549 | HLSC | Hampton Ry., Inc. | added 10/1995; 7/2000-7/2005 | NAKINA | |
| 2550 | HLSC | Hampton Ry., Inc. | added 10/95; 7/2000 | NRHS | |
| 2551 | HLSC | HAMPTON LUMBER SALES [HAMPTON RAILWAY INC] | PWRC | ||
| 2552 | HLSC | Hampton Railway | RSRV | ||
| 2553 | HLSC | HAMPTON RAILWAY INC | SCAC4 | ||
| 2554 | HLSD | HILL, SUSAN D | SCAC4 | ||
| 2555 | HLSF | HANSEATIC LLOYD SCHIFFAHRT GMBH & C | SCAC4 | ||
| 2556 | HLSG | HILLIN SAND & GRAVEL INC | SCAC4 | ||
| 2557 | HLSI | HLS | SCAC4 | ||
| 2558 | HLSL | HOLLAND SPECIAL LOGISTICS LLC | SCAC4 | ||
| 2559 | HLSM | HONEY LOCUST FARMS LLC | SCAC4 | ||
| 2560 | HLSN | HALLS INC | SCAC4 | ||
| 2561 | HLSO | HILLSIDE COLONY INC | SCAC4 | ||
| 2562 | HLSP | HALL'S TRANSPORT INC | SCAC4 | ||
| 2563 | HLSS | HOBBY LOBBY STORES INCORPORATED | SCAC4 | ||
| 2564 | HLSU | HLS CONTAINER BREMEN | SCAC4 | ||
| 2565 | HLSV | HILLSIDE VAN LINES INC | SCAC4 | ||
| 2566 | HLSX | HILLSDALE RAILROAD | PWRC | ||
| 2567 | HLSY | HEMISPHERE LOGISTICS & SUPPLY CHAIN | SCAC4 | ||
| 2568 | HLT | Helitafe | ICAO1 | ||
| 2569 | HLT | Hallandstrafiken AB | SE | VKM | |
| 2570 | HLTA | HOLT OIL COMPANY INC | SCAC4 | ||
| 2571 | HLTC | HI-LITE TRUCK ACCESSORIES LTD | SCAC4 | ||
| 2572 | HLTE | HOTLOAD TRANSPORTATION SERVICES LLC | SCAC4 | ||
| 2573 | HLTF | HAMMER LANE TRUCKING | SCAC4 | ||
| 2574 | HLTG | HARNETT, L T TRUCKING INC | SCAC4 | ||
| 2575 | HLTJ | HLT LIMITED | SCAC4 | ||
| 2576 | HLTK | H & L TRANSPORT | SCAC4 | ||
| 2577 | HLTL | HOLT LOGISTICS CORP | SCAC4 | ||
| 2578 | HLTM | HILTON OIL CO INC | SCAC4 | ||
| 2579 | HLTN | HOLTON TRUCK LINE, INC | SCAC1 | ||
| 2580 | HLTN | HLT SERVICE GROUP INC | SCAC4 | ||
| 2581 | HLTO | HILLTOP TRANSPORTATION | SCAC4 | ||
| 2582 | HLTP | HILLTOP OIL CO | SCAC4 | ||
| 2583 | HLTQ | HOLT, STEVE CONCESSIONS | SCAC4 | ||
| 2584 | HLTR | HOMELAND TRANSPORT INC | SCAC4 | ||
| 2585 | HLTU | HONG XIN CHONK KONG DEVELOPMENT COM | SCAC4 | ||
| 2586 | HLTV | HILLS TRUCK SERVICE | SCAC4 | ||
| 2587 | HLTW | HIGHER-LEVELZ TRUCKING INC | SCAC4 | ||
| 2588 | HLTX | INEOS Olefins & Polymers USA, a Division of INEOS USA LLC | added 7/2008 | NAKINA | |
| 2589 | HLTX | B P Solvay Polyethylene North America | added 4/2004; 7/2005; eliminated 7/2008 | NAKINA | |
| 2590 | HLTX | BP Amoco Chemical Co. | added 4/2002; eliminated 4/2004 | NAKINA | |
| 2591 | HLTX | *BP SOLVAY POLYETHYLENE NORTH AMERICA {BP AMOCO; AMOCO OIL COMPANY] | PWRC | ||
| 2592 | HLTX | +INEOS OLEFINS & POLYMERS USA, DIV. INEOS USA LLC | PWRC | ||
| 2593 | HLTX | Amoco Oil | RSRV | ||
| 2594 | HLTX | INEOS OLEFINS & POLYMERS USA A DIVI | SCAC4 | ||
| 2595 | HLTY | HALTER, RANDY TRUCKING INC | SCAC4 | ||
| 2596 | HLTZ | HOLLIDAY TYLER | PWRC | ||
| 2597 | HLU | Heli Union Heli Prestations | ICAO1 | ||
| 2598 | HLUN | HALL TRUCKING | SCAC4 | ||
| 2599 | HLUS | HAPAG-LLOYD USA LLC | SCAC4 | ||
| 2600 | HLVF | HILLS VAN SERVICE INC (JACKSONVILLE | SCAC4 |