| 5020 | Diagnostic centres, automotive | |
| 5020 | Diagnostic centres, motor vehicle | |
| 3311 | Diagnostic equipment, electromedical, manufacturing | |
| 5150 | Diagnostic equipment, medical, wholesale | |
| 3311 | Diagnostic equipment, MRI (magnetic resonance imaging), manufacturing | |
| 2423 | Diagnostic substances, in-vitro, manufacturing | |
| 3312 | Dial indicators, machinists' precision tools, manufacturing | |
| 3120 | Dial light sockets, radio, manufacturing | |
| 6412 | Dial-a-bottle | |
| 3311 | Dialysis equipment, electromedical, manufacturing | |
| 2412 | Diammonium phosphates, manufacturing | |
| 2899 | Diamond cloth, made from purchased wire | |
| 3691 | Diamond cutting and polishing, manufacturing | |
| 2893 | Diamond dies, metalworking, manufacturing | |
| 2699 | Diamond dressing wheels, manufacturing | |
| 4510 | Diamond drilling for building construction, contractors | |
| 4510 | Diamond drilling, contract (except construction) | |
| 4510 | Diamond mine developing, on a contract basis | |
| 1429 | Diamond mining | |
| 3691 | Diamond points for phonograph needles, manufacturing | |
| 5139 | Diamonds (gems), wholesale | |
| 3691 | Diamonds and precious stones, cutting, polishing, setting | |
| 3691 | Diamonds, cut and polished industrial, manufacturing | |
| 5150 | Diamonds, industrial, natural and crude, wholesale | |
| 5139 | Diamonds, jewellery, wholesale | |
| 1810 | Diaper covers, waterproof, infants', cut and sewn from purchased fabric | |
| 9301 | Diaper supply service | |
| 1810 | Diapers (except disposable), made from purchased fabrics | |
| 5131 | Diapers (except paper), wholesale | |
| 2109 | Diapers, disposable, made from purchased paper or textile wadding | |
| 2101 | Diapers, disposable, made in paper mills | |
| 2519 | Diaphragms (i.e., birth control devices), rubber, manufacturing | |
| 2211 | Diaries and time schedulers, publishers | |
| 2221 | Diaries, manufacturing | |
| 1410 | Diaspore mining | |
| 3311 | Diathermy apparatus, electromedical, manufacturing | |
| 3311 | Diathermy units, manufacturing | |
| 1429 | Diatomaceous earth mine | |
| 1429 | Diatomaceous earth mining | |
| 2699 | Diatomaceous earth, processing beyond beneficiating | |