| 2922 | Turning machines (i.e., lathes), metalworking, manufacturing | |
| 2010 | Turnings, furniture, unfinished wood, manufacturing | |
| 0111 | Turnip farming (for livestock feed) | |
| 0112 | Turnips, table, growing | |
| 3312 | Turnstiles, equipped with counting mechanisms, manufacturing | |
| 5143 | Turpentine and resin, wholesale | |
| 2411 | Turpentine, made by distillation of pine gum or pine wood | |
| 1429 | Turquoise mining | |
| 2922 | Turret lathes, metalworking, manufacturing | |
| 2927 | Turrets, gun, manufacturing | |
| 0500 | Turtle fishing | |
| 8090 | Tutoring | |
| 8090 | Tutors, private | |
| 7130 | Tuxedo rental | |
| 1810 | Tuxedos, cut and sewn from purchased fabric | |
| 3230 | TV (television) sets, manufacturing | |
| 1711 | Twill fabrics, cotton or man-made fibre, broad-woven, weaving | |
| 1723 | Twine (except paper), manufacturing | |
| 1723 | Twine, paper, manufacturing | |
| 5150 | Twine, wholesale | |
| 5150 | Twist drills, wholesale | |
| 6420 | Two-way paging communications carriers | |
| 3220 | Two-way radio system repair | |
| 5233 | Two-way radios, home or auto, retail | |
| 2222 | Typesetting (i.e., computer-controlled, hand, machine), for the printing trade | |
| 2929 | Typesetting machinery, manufacturing | |
| 5139 | Typewriter and other office machine paper, wholesale | |
| 7123 | Typewriter rental | |
| 7250 | Typewriter repair | |
| 7250 | Typewriter repair (including electric) | |
| 3699 | Typewriter ribbons, manufacturing | |
| 7250 | Typewriters and desk calculators, repair service | |
| 3000 | Typewriters, manufacturing | |
| 5239 | Typewriters, retail | |
| 5150 | Typewriters, wholesale | |
| 7499 | Typing services | |
| 1200 | Tyuyamunite mining | |