| 281 | Deltek Inc. | Herndon |
| 282 | Deltek Inc. | Portland |
| 283 | Deltek Inc. | Woburn |
| 284 | Development Engineering (London) Limited | London |
| 285 | DGH Engineering Ltd. | St. Andrews |
| 286 | DIALOG | Calgary |
| 287 | DIALOG | Edmonton |
| 288 | DIALOG | Toronto |
| 289 | DIALOG | Vancouver |
| 290 | Dillon Consulting Limited | Calgary |
| 291 | Dillon Consulting Limited | Chatham |
| 292 | Dillon Consulting Limited | Edmonton |
| 293 | Dillon Consulting Limited | Fredericton |
| 294 | Dillon Consulting Limited | Guelph |
| 295 | Dillon Consulting Limited | Halifax |
| 296 | Dillon Consulting Limited | Halifax |
| 297 | Dillon Consulting Limited | Kitchener |
| 298 | Dillon Consulting Limited | London |
| 299 | Dillon Consulting Limited | Moncton |
| 300 | Dillon Consulting Limited | Oakville |
