| 7401 | TOX | Texhoma Oil & Refining Co. | 8/1920 | | NAKINA |
| 7402 | TOX | Texas Oil Products Co. | 7/1935 | | NAKINA |
| 7403 | TOX | TEXHOMA OIL & REFINING CO. | | | PWRC |
| 7404 | TOXA | TOP TRANS CARRIERS INC | | | SCAC4 |
| 7405 | TOXC | TRANSPORTES MEX-CAL DE B C S DE R L | | | SCAC4 |
| 7406 | TOXD | TALL TOTEM TRANSPORT 1998 LTD | | | SCAC4 |
| 7407 | TOXE | TOX | | | SCAC4 |
| 7408 | TOXG | TORPEDO TRANSPORT | | | SCAC4 |
| 7409 | TOXH | TOGO TRANSPORTATION INC | | | SCAC4 |
| 7410 | TOXM | TRANSPORTES SANTA MONICA | | | SCAC4 |
| 7411 | TOXO | TOXOFIL INC | | | SCAC4 |
| 7412 | TOXS | TEXAS OKLAHOMA EXP INC. | | | PWRC |
| 7413 | TOXS | TSO TRANSPORTATION | | | SCAC4 |
| 7414 | TOXW | TOTAL TRANSPORTATION NETWORK INC | | | SCAC4 |
| 7415 | TOY | Toyota Canada, Inc. | Callsign: Toyota, | CDN | AVCODES |
| 7416 | TOY | S.C. Toyo Aviation S.R.L. | Callsign: Toyo Aviation, | RO | AVCODES |
| 7417 | TOY | Toyota Canada | | | ICAO1 |
| 7418 | TOYA | TOYOTA RACING DEVELOPMENT | | | SCAC4 |
| 7419 | TOYA | Toyama Light Rail Toyamakosen | City: Toyama | J | TRAFFIC |
| 7420 | TOYE | TOYE ENTERPRISES INC | | | SCAC4 |
| 7421 | TOYN | TOYNE TRUCKING LLC | | | SCAC4 |
| 7422 | TOYO | Toyohashi Rail Road Company | Subsidiary of the Meitetsu Group | J | TRAFFIC |
| 7423 | TOYS | TOYS R US | | | SCAC4 |
| 7424 | TOYX | The Tie Yard of Omaha, Inc. | added 1/2005; 7/2005 | | NAKINA |
| 7425 | TOYX | TIE YARD OF OMAHA, INC. | | | PWRC |
| 7426 | TOZI | TWO ONE ZERO ZERO EIGHT SEVEN TWO ( | | | SCAC4 |
| 7427 | TOZO | TRANSPORTES OROZCO (MX-255754) | | | SCAC4 |
| 7428 | TOZS | THREE ONE ZERO FIVE ZERO | | | SCAC4 |
| 7429 | TOZV | TWO ONE ZERO TWO NINE SEVEN THREE ( | | | SCAC4 |
| 7430 | TOZX | Eureka Springs Water Co. | 7/1935-1/1946 | | NAKINA |
| 7431 | TOZX | Ozarka Co. | added 4/1958; 4/1961; eliminated 7/1962 | | NAKINA |
| 7432 | TOZX | Ozarka Water Co., Inc. | added 7/1962; 7/1965-10/1966; eliminated 4/1967 | | NAKINA |
| 7433 | TOZX | Ozarka Water Co. | added 4/1967; 4/1970; eliminated 7/1972 | | NAKINA |
| 7434 | TOZX | Eureka Springs Water Co. | Apr-38 | | NRHS |
| 7435 | TOZX | Ozarka Co. | Apr-61 | | NRHS |
| 7436 | TOZX | Ozarka Water Co., Inc. | 7/65-10/66; eliminated 4/67 | | NRHS |
| 7437 | TOZX | Ozarka Water Co. | added 4/67; 4/70 | | NRHS |
| 7438 | TOZX | OZARKA WATER CO. [EUREKA SPRINGS WATER CO.] | | | PWRC |
| 7439 | TP | Transportes Aereos Portugueses, E.P. | ICAO: TAP, Callsign: Air Portugal, IATA Prefix: 047, Name changed to TAP - Air Portugal | P | AVCODES |
| 7440 | TP | TAP Portugal | ICAO: TAP, Callsign: Air Portugal, IATA Prefix: 047, Name changed from TAP - Air Portugal | P | AVCODES |
| 7441 | TP | Texas & Pacific Ry. Co. | 10/1957-1/1975; eliminated 1/1977 | | NAKINA |
| 7442 | TP | Missouri Pacific R.R. Co. | 1/1980 | | NAKINA |
| 7443 | TP | Missouri Pacific System | added 1/1977; 1/1994; eliminated 4/1997 | | NAKINA |
| 7444 | TP | Union Pacific R.R. Co. | added 4/1997; 7/2000-7/2005 | | NAKINA |
| 7445 | TP | Texas & Pacific Ry. Co. | 10/57-1/75; eliminated 1/77 | | NRHS |
| 7446 | TP | Missouri Pacific R.R. Co. | Jan-80 | | NRHS |
| 7447 | TP | Missouri Pacific System | added 1/77; 1/94; eliminated 4/97 | | NRHS |
| 7448 | TP | Union Pacific R.R. Co. | added 4/97; 7/2000 | | NRHS |
| 7449 | TP | UNION PACIFIC [MISSOURI PACIFIC; TEXAS & PACIFIC RY] | | | PWRC |
| 7450 | TP | Texas and Pacific Railway (Union Pacific Railroad) | | | RSRV |
| 7451 | TP | UNION PACIFIC RAILROAD COMPANY | | | SCAC4 |
| 7452 | TP | Texas Pacific | | USA | TRAFFIC |
| 7453 | TP&W | Toledo, Peoria & Western Ry. Co. | 8/1920-7/1923 | | NAKINA |
| 7454 | TP&W | Toledo, Peoria & Western R.R. | 7/1930-4/1970 | | NAKINA |
| 7455 | TP&W | Toledo, Peoria & Western R.R. | 4/38-4/70 | | NRHS |
| 7456 | TP&W | TOLEDO, PEORIA & WESTERN RWY | | | PWRC |
| 7457 | TP1 | TransPng 1 | | | TRAFFIC |
| 7458 | TP2 | TransPng 2 | | | TRAFFIC |
| 7459 | TPA | Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) | IATA: QT, Callsign: Tampa, IATA Prefix: 729, Name changed to Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) t/a Avianca Cargo w.e.f. 28 May 2013. | CO | AVCODES |
| 7460 | TPA | Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) t/a Avianca Cargo | IATA: QT, Callsign: Tampa, IATA Prefix: 729, Name changed from Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) w.e.f. 28 May 2013. | CO | AVCODES |
| 7461 | TPA | TAMPA | IATA: QT | | ICAO1 |
| 7462 | TPAA | TARTAN PHEASANTRY | | | SCAC4 |
| 7463 | TPAB | TRANSPORT A B SERA INC | | | SCAC4 |
| 7464 | TPAD | TRANSPORT PATRICK ALARCON INC | | | SCAC4 |
| 7465 | TPAE | TRANSPORTES PARUSA S A DE C V | | | SCAC4 |
| 7466 | TPAF | TRANSPORT P A B BOUFFARD | | | SCAC4 |
| 7467 | TPAH | TRANSPORT PLUS, INC | | | SCAC1 |
| 7468 | TPAH | TRANSPORT PLUS INC | | | SCAC4 |
| 7469 | TPAI | THOMAS, PHIL TRUCKING | | | SCAC4 |
| 7470 | TPAJ | TEXPRESS PACKAGES | | | SCAC4 |
| 7471 | TPAL | TRANSPORTES ALANIS | | | SCAC4 |
| 7472 | TPAQ | TOPSAIL INC | | | SCAC4 |
| 7473 | TPAR | TRANSPORTES ARTURO MONTEVERDE SA DE | | | SCAC4 |
| 7474 | TPAS | TRANSPORT ANT-PASS LTEE | | | SCAC4 |
| 7475 | TPAT | TRANSPORT PATENAUDE INC | | | SCAC4 |
| 7476 | TPAV | TRANSPORTES ANROVA | | | SCAC4 |
| 7477 | TPAX | Trans Pacific Leasing Inc. | added 1/1970; 4/1970-1/1975; eliminated 7/1976 | | NAKINA |
| 7478 | TPAX | Trans Pacific Leasing Inc. | added 1/70; 4/70-1/75; eliminated 7/76 | | NRHS |
| 7479 | TPAX | TRANS PACIFIC LEASING INC. | | | PWRC |
| 7480 | TPAX | TTX COMPANY | | | SCAC4 |
| 7481 | TPB | Aero Tropical, Lda | Callsign: Aero Tropical, | ANG | AVCODES |
| 7482 | TPB | Aero Tropical | | | ICAO1 |
| 7483 | TPB | Transporto Pubblico del Bellinzonese | City: Bellinzona | CH | TRAFFIC |
| 7484 | TPBA | TRANSPORTES BERNAL | | | SCAC4 |
| 7485 | TPBD | TP TRUCKING (BROKERAGE DIVISION) | | | SCAC4 |
| 7486 | TPBE | TRANSPORT BERNIERES INC | | | SCAC4 |
| 7487 | TPBF | T P L R HONEY FARMS | | | SCAC4 |
| 7488 | TPBG | TORRE PEREZ, AGUSTIN | | | SCAC4 |
| 7489 | TPBI | Transports publics biennois / Verkehrsbetriebe Biel | Real: tpb | CH | TRAFFIC |
| 7490 | TPBL | TRANSPORT PIERRE BOLDUC INC | | | SCAC4 |
| 7491 | TPBM | TRANSPORT BERTRAND MATHIEU INC | | | SCAC4 |
| 7492 | TPBN | TRIPLE B TRUCKING LLC | | | SCAC4 |
| 7493 | TPBP | TRIPLE B CORPORATION | | | SCAC4 |
| 7494 | TPBQ | TRANSPORT BHOPAL | | | SCAC4 |
| 7495 | TPBR | TRANSPORT BROKERS INC | | | SCAC4 |
| 7496 | TPBS | TRACKSIDE PERFORMANCE LLC | | | SCAC4 |
| 7497 | TPBUS | Komunikacja Gminy Tarnowo Podgórne "TPBUS" sp. z o.o. | City: Tarnowo Podgórne | PL | TRAFFIC |
| 7498 | TPBX | General American Transportation Corp. | added 4/1970; 1/1975-1/1980; eliminated 10/1992 | | NAKINA |
| 7499 | TPBX | General American Transportation Corp. | added 4/70; 1/75-1/80; eliminated 10/92 | | NRHS |
| 7500 | TPBX | (GATX) RETIRED 08-19-92 ATP (1790) [TEXACO INC. - LESSEE] | | | PWRC |
