| 7513 | Transportation commission, local administration | |
| 7421 | Transportation consultants (consulting engineering) | |
| 7513 | Transportation control and safety programs, provincial administration | |
| 5150 | Transportation equipment and supplies (except motor vehicles), wholesale | |
| 5150 | Transportation equipment industries, machinery, equipment and supplies, wholesale | |
| 3610 | Transportation equipment seating, manufacturing | |
| 7492 | Transportation guard service | |
| 7513 | Transportation licensing, federal administration | |
| 5150 | Transportation machinery and equipment (except motor vehicle), wholesale | |
| 7414 | Transportation management consulting services | |
| 6110 | Transportation of freight on bays and sounds of the oceans | |
| 6120 | Transportation on rivers and canals, passenger | |
| 6010 | Transportation, railway | |
| 6023 | Transportation, used uncrated goods (household, museum, hospital, factory) | |
| 6023 | Transporting automobiles and other motor vehicles, local | |
| 6023 | Transporting milk | |
| 6023 | Transporting mobile homes, local | |
| 0500 | Trap net fishing, freshwater fish | |
| 3693 | Trap racks (clay targets) | |
| 1410 | Trap rock, crushed and broken stone, quarrying | |
| 1410 | Trap rock, dimension, quarrying | |
| 5139 | Trap shooting equipment and supplies, wholesale | |
| 0150 | Trapping | |
| 0150 | Trapping carried on as a business enterprise | |
| 0150 | Trapping fur-bearing animals for furs | |
| 0150 | Trapping, wild animals for furs (except seal skins) | |
| 2899 | Traps, animal and fish, made from purchased wire | |
| 3693 | Traps, shooting equipment, manufacturing | |
| 2912 | Traps, water, manufacturing | |
| 9241 | Trapshooting facilities, recreational | |
| 2919 | Trash and garbage compactors, commercial type, manufacturing | |
| 9000 | Trash collection | |
| 2930 | Trash compactors, household, manufacturing | |
| 2520 | Trash containers, plastics, manufacturing | |
| 9000 | Trash disposal, incinerator and combustor | |
| 9000 | Trash disposal, landfill | |
| 2811 | Trash racks, fabricated metal plate, manufacturing | |
| 6304 | Travel agencies | |
| 6304 | Travel arranging | |
| 2221 | Travel guide books, printing without publishing | |