| Telephone Answering Service | 855 |
| Telephone Calling Cards-Whsle & Mfrs | 855 |
| Telephone Communications Services | 855 |
| Telephone Companies | 855 |
| Telephone Equipment & Systems- Service & | 856 |
| Repair |
| Telephone Equipment & Systems-Dealers | 856 |
| Telephone-Messages & Music On Hold | 856 |
| Telephone & Television Cable Contractors | 857 |
| Telephone Service-Long Distance | 857 |
| Television-Cable, CATV, Satellite & Fiber | 857 |
| Television & Radio-Dealers | 858 |
| Television & Radio-Renting & Leasing | 858 |
| Television & Radio-Service & Repair | 858 |
| Television Program Producers | 858 |
| Television Stations & Broadcasting Companies | 859 |
| Television Systems & Equipment- Closed Circuit | 859 |
| Temples | 859 |
| Tennis Court Construction | 859 |
| Tennis Courts-Private | 859 |
| Tennis Courts-Public | 860 |
| Tennis Equipment & Supplies | 860 |
| Tennis Instruction | 860 |
| Tents | 860 |
| Tents-Renting | 860 |
| Terminals-River & Marine | 861 |
| Termite Damage Restoration | 861 |
| Termite Inspections | 861 |
| Terrazzo | 861 |
| Testing | 861 |
| Theatres | 863 |
| Theatres-Stage | 863 |
| Theatrical & Stage Lighting Equipment | 869 |
| Theatrical Equipment & Supplies | 869 |
| Theatrical Managers & Producers | 869 |
| Thermocouples | 869 |
| Thermometer Wells | 869 |
| Thrift Shops | 869 |
| Ticket Sales-Events | 869 |
| Tile-Ceramic-Contractors & Dealers | 869 |
| Tile-Ceramic-Repairing & Refinishing | 870 |
| Tile-Ceramic-Whol & Mfrs | 870 |
| Tile-Nonceramic-Contractors & Dealers | 871 |
| Timber & Timberland Companies | 871 |
| Time & Temperature Announcements | 871 |
| Time Recorders | 871 |
| Tire Changing Equipment | 871 |
| Tire Customizing & Modification | 871 |
| Tire Dealers | 871 |
| Tire Dealers-Used | 874 |
| Tire Dealers-Whsle | 874 |
| Tire Mfrs & Distributors | 874 |
| Tire Retreading & Repairing | 874 |
| Title Companies | 874 |
| Titling Service-Television & Motion Picture | 876 |
| Tobacco Products | 876 |
| Toilets-Portable | 876 |
| Tools | 877 |
| Tools-Cutting | 877 |
| Tools-Electric | 877 |
| Tools-Hand | 877 |
| Tools-Hydraulic | 877 |
| Tools-Pneumatic | 877 |
| Tools-Renting | 877 |
| Tools-Repairing & Parts | 877 |
| Topsoil | 877 |
| Tourist Information | 878 |
| Tourists’ Attractions | 879 |
| Tours | 880 |