| 301 | Dillon Consulting Limited | Ottawa |
| 302 | Dillon Consulting Limited | Richmond |
| 303 | Dillon Consulting Limited | Saint John |
| 304 | Dillon Consulting Limited | Saskatoon |
| 305 | Dillon Consulting Limited | St. John's |
| 306 | Dillon Consulting Limited | Sydney |
| 307 | Dillon Consulting Limited | Toronto |
| 308 | Dillon Consulting Limited | Windsor |
| 309 | Dillon Consulting Limited | Winnipeg |
| 310 | Dillon Consulting Limited | Yellowknife |
| 311 | DKM Engineering Ltd. | Regina |
| 312 | DL Minter Engineering Inc. | Saskatoon |
| 313 | DMD & Associates Electrical Consultants Ltd. | Lynden |
| 314 | DMD & Associates Electrical Consultants Ltd. | Surrey |
| 315 | DMG Consulting Limited | Gander |
| 316 | DMG Consulting Limited | St. John's |
| 317 | Doherty Engineering Inc. | Mississauga |
| 318 | Dorward Engineering Services Ltd. | Whitehorse |
| 319 | Doug Dixon & Associated | Brampton |
| 320 | DST Consulting Engineers Inc. | Thunder Bay |
