| 41 | Ainley Group | Gloucester |
| 42 | Ainley Group | Kingston |
| 43 | Aiolos Engineering Corporation | Toronto |
| 44 | Akron Engineering Consultant's Group Ltd. | Fort McMurray |
| 45 | Al-Terra Engineering (Red Deer) Ltd. | Red Deer |
| 46 | Al-Terra Engineering Ltd. | Edmonton |
| 47 | ALFA Engineering Ltd. | Regina |
| 48 | Allnorth Consultants Limited | Vancouver |
| 49 | Allnorth Consultants Limited | Calgary |
| 50 | Allnorth Consultants Limited | Dartmouth |
| 51 | Allnorth Consultants Limited | Edmonton |
| 52 | Allnorth Consultants Limited | Fort Nelson |
| 53 | Allnorth Consultants Limited | Grande Prairie |
| 54 | Allnorth Consultants Limited | Phoenix |
| 55 | Allnorth Consultants Limited | Prince George |
| 56 | Allnorth Consultants Limited | Saskatoon |
| 57 | Allnorth Consultants Limited | St John's |
| 58 | Almor Testing Services Ltd. | Calgary |
| 59 | Anrep Krieg Desilets Gravelle Ltd. | North Bay |
| 60 | Aplin Martin | Calgary |
