| 301 | HASD | HAULIN A'S EXPRESS DELIVERY LLC | SCAC4 | ||
| 302 | HASIT | HASIT Šumavské vápenice a omítkárny, a.s. | CZ | VKM | |
| 303 | HASK | HINKLE AND SON TRUCKING | SCAC4 | ||
| 304 | HASL | HILLS AIR SUPPORT LLC | SCAC4 | ||
| 305 | HASN | H AND S CAR CARRIERS INC | SCAC4 | ||
| 306 | HASP | HOLLY ASPHALT COMPANY | SCAC4 | ||
| 307 | HASQ | H & S TRUCKING | SCAC4 | ||
| 308 | HASU | HAMBURG SUED | SCAC4 | ||
| 309 | HASW | H&S WAREHOUSE, INC | SCAC1 | ||
| 310 | HASZ | HARVEST STATE COOP | PWRC | ||
| 311 | HAT | Air Taxi | ICAO1 | ||
| 312 | HATA | HANSEN AUTO TRANSPORT INC | SCAC4 | ||
| 313 | HATB | HATBORO DELIVERY SERVICE, INC | SCAC1 | ||
| 314 | HATB | HATBORO DELIVERY SERVICE INC | SCAC4 | ||
| 315 | HATI | HA TRANSPORTATION INC | SCAC4 | ||
| 316 | HATJ | H & A TRANSPORTATION LLC | SCAC4 | ||
| 317 | HATK | HALO TRUCKING INC | SCAC4 | ||
| 318 | HATL | HALL'S, L. C | SCAC1 | ||
| 319 | HATL | HALLS, L C TRUCK LINE INC | SCAC4 | ||
| 320 | HATN | HAAS TRUCKING INC | SCAC4 | ||
| 321 | HATO | HARRINGTON TRUCKING, INC | SCAC1 | ||
| 322 | HATO | Hato Bus Co., Ltd | Hato Bus Co., Ltd is a sightseeing bus company in Japan, based in Heiwajima, Ohta-ku, Tokyo. | J | TRAFFIC |
| 323 | HATP | HAUL-AWAY TRANSPORTATION LLC | SCAC4 | ||
| 324 | HATU | H A T ENTERPRISES INC | PWRC | ||
| 325 | HATU | H A T Enterprises | RSRV | ||
| 326 | HATU | HOST RAIL LTD | SCAC4 | ||
| 327 | HATVAN | Hatvani Volán | H | TRAFFIC | |
| 328 | HATW | HERRERA, A TRUCKING | SCAC4 | ||
| 329 | HATX | HELM Financial Corp. | added 1/2001; 7/2005 | NAKINA | |
| 330 | HATX | Helm-Atlantic Associates, L.P. | added 10/1994; 7/2000; eliminated 1/2001 | NAKINA | |
| 331 | HATX | Helm-Atlantic Associates, L.P. | added 10/94; 7/2000; eliminated 1/2001 | NRHS | |
| 332 | HATX | HELM Financial Corp. | added 1/2001 | NRHS | |
| 333 | HATX | HELM-ATLANTIC ASSOCIATES (HELM FINANCIAL CORP.) | PWRC | ||
| 334 | HATX | Helm Financial Corporation | RSRV | ||
| 335 | HATX | HELM FINANCIAL CORPORATION | SCAC4 | ||
| 336 | HATX | Helm Financial Corporation | USA | TRAFFIC | |
| 337 | HATY | HOW ABOUT THAT | SCAC4 | ||
| 338 | HATZ | *H A T ENTERPRISES INC | PWRC | ||
| 339 | HATZ | *HALLETT | PWRC | ||
| 340 | HATZ | H A T Enterprises | RSRV | ||
| 341 | HATZ | H A T ENTERPRISES INC | SCAC4 | ||
| 342 | HAU | Skyhaul | ICAO1 | ||
| 343 | HAUG | HAUGEN, C D INC | SCAC4 | ||
| 344 | HAUK | HAUK EXPRESS LEASING | SCAC4 | ||
| 345 | HAUT | H & U TRANSPORT | SCAC4 | ||
| 346 | HAV | Havilah Air Services | ICAO1 | ||
| 347 | HAVC | HARVEY TRANSPORT INC | SCAC4 | ||
| 348 | HAVEN | Haven Bus | GB | TRAFFIC | |
| 349 | HAVF | HAV FREIGHT | SCAC4 | ||
| 350 | HAVK | HAVELOCK TRUCKING INC | SCAC4 | ||
| 351 | HAVS | HAVENS & SONS HARVESTING | SCAC1 | ||
| 352 | HAVU | CUBAEXPORT ENTERPRISE | SCAC3 | ||
| 353 | HAVX | HAVERHILL CHEMICALS LLC | SCAC4 | ||
| 354 | HAVY | HAVEY, WAYNE INCORPORATED | SCAC4 | ||
| 355 | HAW | Bangkok Aviation Center | ICAO1 | ||
| 356 | HAWB | HAWKEYE LOGISTICS INC | SCAC4 | ||
| 357 | HAWC | H & W TRANSFER AND | SCAC4 | ||
| 358 | HAWE | HAWAII PETROLEUM | SCAC4 | ||
| 359 | HAWF | H & W TRUCKING LLC | SCAC4 | ||
| 360 | HAWG | HAWK FREIGHT SERVICES INC | SCAC4 | ||
| 361 | HAWM | H&W MTR EXP CO | PWRC | ||
| 362 | HAWM | H&W MOTOR EXPRESS COMPANY | SCAC1 | ||
| 363 | HAWO | HARTLAND ARMATURE WORKS LTD | SCAC4 | ||
| 364 | HAWQ | HAWKS, MILT & SON INC | SCAC4 | ||
| 365 | HAWR | HAWK LOGISTICS | SCAC4 | ||
| 366 | HAWX | GLENN O. HAWBAKER, INC. | PWRC | ||
| 367 | HAWX | GLENN O HAWBAKER INC | SCAC4 | ||
| 368 | HAWY | HARRISON, WAYNE LOG HAULING | SCAC4 | ||
| 369 | HAX | Benair | ICAO1 | ||
| 370 | HAX | Almer Railway Equipment Co. | 7/1935-4/1938 | NAKINA | |
| 371 | HAX | Almer Railway Equipment Co. | Apr-38 | NRHS | |
| 372 | HAX | ALMER RAILWAY EQUIPMENT CO. | PWRC | ||
| 373 | HAXS | HASSETT AIR EXPRESS, Hassett Storage Warehouses, INC | SCAC1 | ||
| 374 | HAXS | HASSETT AIR EXPRESS | SCAC4 | ||
| 375 | HAYB | HAY BROTHERS INC | SCAC4 | ||
| 376 | HAYC | HAYES TRUCKING | SCAC4 | ||
| 377 | HAYD | HAYDAY FARMS INC | SCAC4 | ||
| 378 | HAYF | HAY FARMS | SCAC4 | ||
| 379 | HAYG | HAYHURST TRANSPORT | SCAC4 | ||
| 380 | HAYH | HAYNES FURNITURE COMPANY INC | SCAC4 | ||
| 381 | HAYL | HAYLES TRUCKING | SCAC4 | ||
| 382 | HAYN | HAYNES MOTOR LINES LLC | SCAC4 | ||
| 383 | HAYO | HAYWOOD TRUCKING & WAREHOUSING INC | SCAC4 | ||
| 384 | HAYQ | HAYTER DRILLING LTD | SCAC4 | ||
| 385 | HAYR | HAY RAY | SCAC4 | ||
| 386 | HAYS | HAYES BROS TRUCKING INC | SCAC4 | ||
| 387 | HAYT | HAYES LOGISTICS INC | SCAC4 | ||
| 388 | HAYV | HLI ENTERPRISES LLC | SCAC4 | ||
| 389 | HAYW | HAYWARD LOGISTICS | SCAC4 | ||
| 390 | HAZB | HAZELBRIDGE MARINE INDUSTRIES | SCAC4 | ||
| 391 | HAZC | HAZCO TRANSPORTATION SERVICES LTD | SCAC4 | ||
| 392 | HAZD | HAZARD EXPRESS, INC | SCAC1 | ||
| 393 | HAZD | HAZARD EXPRESS INC | SCAC4 | ||
| 394 | HAZN | HAZLETON OIL AND ENVIRONMENTAL | SCAC4 | ||
| 395 | HAZP | HAZARD PETROLEUM INC | SCAC4 | ||
| 396 | HAZT | HARTZ TRUCK LINE INC | SCAC4 | ||
| 397 | HAZX | Hazel-Atlas Glass Co. | 7/1937-1/1941 | NAKINA | |
| 398 | HAZX | Hazel-Atlas Glass Co. | Apr-38 | NRHS | |
| 399 | HAZX | HAZEL-ATLAS GLASS CO. | PWRC | ||
| 400 | HB | Hirtshalsbanen | 1925 - 1945 | DK | jernbanen.dk |