| 6110 | Deep sea foreign transportation | |
| 6110 | Deep sea foreign transportation of freight | |
| 6110 | Deep water transportation of freight (except by ferries) | |
| 6110 | Deep water transportation of passengers (except by ferries) | |
| 4520 | Deep wells, water | |
| 7421 | Defence consulting services | |
| 7522 | Defence research board, federal government | |
| 7522 | Defence services, federal government | |
| 3311 | Defibrillators, manufacturing | |
| 2412 | Defluorinated phosphates, manufacturing | |
| 2429 | Defoamers and anti-foaming agents, manufacturing | |
| 2421 | Defoliants, manufacturing | |
| 3190 | Defrosters, permanent, motor vehicle, manufacturing | |
| 2919 | Degreasing equipment, manufacturing | |
| 2424 | Degreasing preparations for machinery parts, manufacturing | |
| 2424 | Degreasing preparations, household type, manufacturing | |
| 1711 | Degreasing wool | |
| 8030 | Degree-granting institutions | |
| 0140 | Degumming cotton and other plant, contract | |
| 2919 | Dehumidifiers (except portable), manufacturing | |
| 2930 | Dehumidifiers, portable, electric, manufacturing | |
| 1520 | Dehydrated milk, manufacturing | |
| 1549 | Dehydrated potatoes, packaged with other ingredients, manufacturing | |
| 1513 | Dehydrating fruits and vegetables | |
| 1513 | Dehydrating potato products (e.g., flakes, granules) | |
| 3530 | De-icing equipment, aircraft, manufacturing | |
| 2429 | Deicing preparations, manufacturing | |
| 2101 | De-inking plants | |
| 2101 | De-inking recovered paper | |
| 6412 | Delivering food for a restaurant | |
| 2899 | Delivery cases, made from purchased wire | |
| 6412 | Delivery of newspapers to newsboy | |
| 6412 | Delivery of newspapers to newspaper boxes | |
| 6411 | Delivery service, postal | |
| 6023 | Delivery service, truck | |
| 3420 | Delivery truck bodies, manufacturing | |
| 3312 | Demand meters, electric, manufacturing | |
| 5150 | Demand meters, wholesale | |
| 7320 | Demographic research and development services | |
| 4510 | Demolishing buildings and structures | |