| 7523 | Detention centres, municipal/local | |
| 7523 | Detention centres, provincial government | |
| 2424 | Detergents (e.g., dishwashing, industrial, laundry), manufacturing | |
| 5139 | Detergents, household, wholesale | |
| 5139 | Detergents, wholesale | |
| 3710 | Detinning scrap (e.g., cans) | |
| 2429 | Detonating caps, cords, fuses and primers, manufacturing | |
| 2429 | Detonators (except ammunition), manufacturing | |
| 5149 | Detonators and fuses, wholesale | |
| 2429 | Detonators, ammunition (i.e., more than 30 mm; more than 1.18 inch), manufacturing | |
| 8519 | Detoxification centres, outpatient | |
| 8511 | Detoxification hospitals | |
| 4520 | Deuterium oxide (heavy water) plants, construction | |
| 2411 | Deuterium oxide (heavy water), manufacturing | |
| 2429 | Developers, prepared photographic, manufacturing | |
| 9211 | Developing and printing of commercial motion picture film | |
| 7494 | Developing and printing of films (except for the motion picture industry) | |
| 3530 | Developing and producing prototypes for aerospace products | |
| 3530 | Developing and producing prototypes for aircraft | |
| 3530 | Developing and producing prototypes for aircraft engines and engine parts | |
| 3530 | Developing and producing prototypes for aircraft parts (except engines) and auxiliary equipment | |
| 3530 | Developing and producing prototypes for aircraft parts and auxiliary equipment | |
| 3530 | Developing and producing prototypes for guided missile and space vehicle components | |
| 3530 | Developing and producing prototypes for guided missile and space vehicle engines | |
| 5139 | Developing apparatus, photographic, wholesale | |
| 3320 | Developing equipment, photographic film, manufacturing | |
| 7010 | Developing real estate | |
| 7310 | Development of computer and related technology (hardware) | |
| 9199 | Developmentally handicap organizations | |
| 4510 | Dewatering, contractors | |
| 0113 | Dewberry farming | |
| 2429 | Dextrin glues, manufacturing | |
| 1532 | Dextrin, made by wet-milling corn | |
| 1532 | Dextrose, made by wet-milling corn | |
| 1410 | Diabase, crushed and broken stone, quarrying | |
| 1410 | Diabase, dimension, quarrying | |
| 1410 | Diabase, quarrying | |
| 3311 | Diagnostic apparatus, physicians', manufacturing | |
| 2423 | Diagnostic biological preparations (except in-vitro), manufacturing | |
| 2423 | Diagnostic biological preparations, manufacturing | |