| 1601 | TCG | Tucson, Cornelia and Gila Bend R.R. Co. | 1/1941-1/1994; eliminated 10/1997; 7/2000-7/2005 | | NAKINA |
| 1602 | TCG | Tucson, Cornelia and Gila Bend R.R. Co. | 1/52-1/94; eliminated 10/97; 7/2000 | | NRHS |
| 1603 | TCG | TUCSON, CORNELIA & GILA BEND RAILROAD COMPANY | | | PWRC |
| 1604 | TCG | Tucson, Cornelia and Gila Bend Railroad | | | RSRV |
| 1605 | TCG | Tuzi Construzioni Generali | | I | TRAFFIC |
| 1606 | TCGA | TOP CHOICE INC | | | SCAC3 |
| 1607 | TCGA | TRANS CARGO TEAM | | | SCAC4 |
| 1608 | TCGC | TRANS-CARGO INTERNATIONAL CORPORATI | | | SCAC3 |
| 1609 | TCGC | TRANSPORTES CEEG | | | SCAC4 |
| 1610 | TCGD | TRUCKERS ASSOCIATION OF CHICAGO LLC | | | SCAC4 |
| 1611 | TCGE | TRANSPORTES DE CARGA ENSENADA S A D | | | SCAC4 |
| 1612 | TCGG | TRI COUNTY CO OPERATIVE OIL ASSOCIA | | | SCAC4 |
| 1613 | TCGI | TRANS CARGO INTERSTATE CO | | | SCAC3 |
| 1614 | TCGI | TRANSPORT CGSM INC | | | SCAC4 |
| 1615 | TCGK | TRAFFIC CONSULTING SERVICES | | | SCAC4 |
| 1616 | TCGL | TEAM CAMPBELL LOGISTICS LLC | | | SCAC4 |
| 1617 | TCGN | TCG | | | SCAC4 |
| 1618 | TCGO | TRANSCARGO UNLIMITED INC | | | SCAC4 |
| 1619 | TCGQ | TRANSPORT CARTAGE & DISTR CO INC | | | SCAC3 |
| 1620 | TCGS | TRANSMARK CARTAGE SERVICES | | | SCAC4 |
| 1621 | TCGU | TRANSPORTS COTTARD-GLENAT CHIMIE | | F | BIC |
| 1622 | TCGU | COTTARD TRANSPORTS GLENAT CHIMIE | | | SCAC4 |
| 1623 | TCGV | TRANS OCEAN LOGISTICS B V | | | SCAC4 |
| 1624 | TCGW | TRANSPORTES CRUZADOS SA DE CV | | | SCAC4 |
| 1625 | TCGX | Tri-County Gas, Inc. | added 10/1983; 1/1994; eliminated 7/1996; added 10/1996; eliminated 4/1997 | | NAKINA |
| 1626 | TCGX | Williams Energy Ventures, Inc. | added 10/1999; 7/2000; eliminated 4/2002; 7/2005 (not listed) | | NAKINA |
| 1627 | TCGX | Tri-County Gas, Inc. | added 10/83; 1/94; eliminated 7/96; added 10/96; eliminated 4/97 | | NRHS |
| 1628 | TCGX | Williams Energy Ventures, Inc. | added 10/99; 7/2000 | | NRHS |
| 1629 | TCGX | WILLIAMS ENERGY VENTURES, INC. [TRI-COUNTY GAS, INC.] | | | PWRC |
| 1630 | TCGX | Tri-County Gas | | | RSRV |
| 1631 | TCGY | TRANSPORTES DE CARGA RIO GRANDE SA | | | SCAC4 |
| 1632 | TCGZ | COLUMBUS & GREENVILLE RWY | | | PWRC |
| 1633 | TCGZ | Columbus and Greenville Railway | | | RSRV |
| 1634 | TCGZ | COLUMBUS AND GREENVILLE RAILWAY | | | SCAC4 |
| 1635 | TCH | TCH of Russian Airlines | IATA: 4T, Callsign: Trans-Charter, Designator 4T recalled by IATA | RUS | AVCODES |
| 1636 | TCH | Transcontinental Air WLL | Callsign: Trans Gulf, | BRN | AVCODES |
| 1637 | TCH | Transcontinental Air | | | ICAO1 |
| 1638 | TCHA | TECHTRAN INC | | | SCAC3 |
| 1639 | TCHB | TRANSPORT R CHAMBERLAND (1986) LTD | | | SCAC3 |
| 1640 | TCHB | TRANSPORTES DE CARGA HB S A DE C V | | | SCAC4 |
| 1641 | TCHC | TILLEY CHEMICAL CO INC | | | SCAC4 |
| 1642 | TCHD | TRIPLE C HOLDINGS CORP | | | SCAC4 |
| 1643 | TCHE | TECHE PIPE LINE COMPANY | | | SCAC3 |
| 1644 | TCHH | TERMOTEC DE CHIHUAHUA SA DE CV | | | SCAC4 |
| 1645 | TCHI | TRANSPORTATION CHARTER SERVICES INC | | | SCAC3 |
| 1646 | TCHI | TRANSPORTATION CHARTER SERVICES INC | | | SCAC4 |
| 1647 | TCHL | TOMASOS (HELLAS) PIRAEUS GREECE | | | SCAC3 |
| 1648 | TCHL | TRANSPORT CATHLO INC | | | SCAC4 |
| 1649 | TCHM | TCH TRANSPORT CANADA | | | SCAC4 |
| 1650 | TCHN | TECHNICAL TRANSPORTERS INC | | | SCAC3 |
| 1651 | TCHO | TRANSCOMMERCE HOLDING | | | SCAC3 |
| 1652 | TCHO | TRANSPORTES CAMACHO S A DE C V | | | SCAC4 |
| 1653 | TCHP | TST TRUCKLOAD EXPRESS (DIV OF TST S | | | SCAC4 |
| 1654 | TCHT | TREASURE COAST HORSE TRANSPORTATION | | | SCAC3 |
| 1655 | TCHU | TORAN SOLUTION LTD C/O SANTOS CONTAINER LTDA | | BR | BIC |
| 1656 | TCHV | TRANSPORTES CHAVEZ | | | SCAC4 |
| 1657 | TCI | Turks & Caicos Airways | IATA: QW, Callsign: Turk National, IATA Prefix: 254, | TC | AVCODES |
| 1658 | TCI | Turks & Caicos Airways (2003) Ltd | Callsign: Kerrmont, | TC | AVCODES |
| 1659 | TCI | Amber Aviation Limited | Callsign: Amber, Established in February 2017. | PRC | AVCODES |
| 1660 | TCI | Air Turks and Caicos | IATA: JY | | ICAO1 |
| 1661 | TCIA | TRANSPORTES GRACIA | | | SCAC4 |
| 1662 | TCIB | TRANSPORTATION CONCEPTS INC | | | SCAC3 |
| 1663 | TCIC | TRAIL CAR INC | | | SCAC3 |
| 1664 | TCID | TRANSPORT CONCEPTS INTERNATIONAL IN | | | SCAC4 |
| 1665 | TCIG | TRAVEL CONNECTION INC | | | SCAC3 |
| 1666 | TCIH | T C INSTANT EXPRESS INC | | | SCAC3 |
| 1667 | TCII | TRANSCONEX INTERNATIONAL INC | | | SCAC3 |
| 1668 | TCII | TRANSCONEX INTERNATIONAL INC | | | SCAC4 |
| 1669 | TCIJ | TIANJIN CONSOL LINES | | | SCAC4 |
| 1670 | TCIK | TIGER CREEKTRANSPORT INC | | | SCAC4 |
| 1671 | TCIL | TWIN-CITY LIMITED INC | | | SCAC3 |
| 1672 | TCIL | TRANSPORTES DE CARGA INTERNACIONAL | | | SCAC4 |
| 1673 | TCIM | TRANSPORT COMMANDO INC | | | SCAC4 |
| 1674 | TCIO | TCI TRUCKING | | | SCAC3 |
| 1675 | TCIO | TCI TRUCKING | | | SCAC4 |
| 1676 | TCIP | TRANS CARGO INC | | | SCAC4 |
| 1677 | TCIQ | TRI-CITY TRANSFER & STORAGE INC | | | SCAC3 |
| 1678 | TCIR | T R A C E INTERNATIONAL INC | | | SCAC3 |
| 1679 | TCIS | TRANSPORTATION & CONSOLIDATION SERV | | | SCAC3 |
| 1680 | TCIT | TWIN CITY TRUCKING INC | | | SCAC3 |
| 1681 | TCIT | TIPS COMPANIES INC | | | SCAC4 |
| 1682 | TCIU | TITAN CONTAINERS A/S | | DK | BIC |
| 1683 | TCIU | TECORE INTERNATIONAL LTD | | | SCAC3 |
| 1684 | TCIU | TITAN CONTAINERS INTERNATIONAL A/S | | | SCAC4 |
| 1685 | TCIV | T C I TRANSPORTATION SERVICES INC | | | SCAC4 |
| 1686 | TCIW | TRIPLE C TRANSPORTATION SERVICES IN | | | SCAC4 |
| 1687 | TCIX | Tennessee Coal, Iron and R.R. Co. | 8/1920-7/1954; eliminated 7/1957 | | NAKINA |
| 1688 | TCIX | Trinity Chemical Leasing, L.L.C. | added 4/2000; 7/2000; eliminated 10/2000; added 1/2003; eliminated 4/2003; 7/2005 (not listed) | | NAKINA |
| 1689 | TCIX | Tennessee Coal, Iron and Railroad Co. | 4/38-1/52 | | NRHS |
| 1690 | TCIX | Trinity Chemical Leasing, L.L.C. | added 4/2000; 7/2000; eliminated 10/2000 | | NRHS |
| 1691 | TCIX | *TENNESSEE COAL, IRON & RAILROAD CO. | | | PWRC |
| 1692 | TCIX | +TRINITY CHEMICAL LEASING, LLC | | | PWRC |
| 1693 | TCIX | Trinity Chemical Leasing | | | RSRV |
| 1694 | TCIX | TRINITY CHEMICAL LEASING LLC | | | SCAC4 |
| 1695 | TCIY | TLC CONSTRUCTION | | | SCAC4 |
| 1696 | TCIZ | TRIPLE CROWN SERVICES INC | | | SCAC4 |
| 1697 | TCJ | TAG Aviation (Cayman) SEZC | Callsign: TAG Island, | CAY | AVCODES |
| 1698 | TCJB | TRANSPORT CJB BELANGER INC | | | SCAC4 |
| 1699 | TCJC | TRANSPORT CLAUDE LUSSIER | | | SCAC4 |
| 1700 | TCJE | TRI-COAST CARRIERS LLC | | | SCAC4 |
