| 461 | Dillon Consulting Limited | Sydney |
| 462 | Dillon Consulting Limited | Toronto |
| 463 | Dillon Consulting Limited | Toronto |
| 464 | Dillon Consulting Limited | Vancouver |
| 465 | Dillon Consulting Limited | Vaughan |
| 466 | Dillon Consulting Limited | Windsor |
| 467 | Dillon Consulting Limited | Winnipeg |
| 468 | Dillon Consulting Limited | Yellowknife |
| 469 | dIREKTION360 | Montréal |
| 470 | DKM Engineering Ltd. | Regina |
| 471 | DL Minter Engineering Inc. | Saskatoon |
| 472 | DMD & Associates Electrical Consultants Ltd. | Surrey |
| 473 | DMD & Associates Electrical Consultants Ltd. | Lynden |
| 474 | DMG Consulting Limited | Gander |
| 475 | DMG Consulting Limited | St. John's |
| 476 | Doherty Engineering Inc. | Mississauga |
| 477 | Dorward Engineering Services Ltd. | Whitehorse |
| 478 | Doug Dixon & Associated | Brampton |
| 479 | Driftstone Consulting Inc. | Regina |
| 480 | Dumac Energy Limited | Halifax |
