| Arturos Cleaning/Limpiesa | Montréal | Cleaning Services, Cleaning Service |
| Arôme Concierge Dépôt | Saint-Léonard | Cleaning & Janitorial Supplies |
| As du Lavage à Pression | Montréal | Building Exterior Cleaning |
| ASA Cleaning Service | Montréal | Cleaning Services, Cleaning Service |
| ASentretien | Montréal | Cleaning Services, Cleaning Service |
| Asg Autoart | Saint-Lambert | Car Repair |
| ASI Computer Technologies (Canada) Corp | Montréal | Information Technologies (IT) |
| Asi Corporation | Montréal | Computer Manufacturers & Wholesalers |
| Aspira Nettoyage | Montréal | Cleaning Services, Cleaning Service |
| Aspirmatic | Laval | Cleaning Services, Cleaning Service |
Publicité (Desktop) Publicité (Mobile) |
| Assure-Entretien | Montréal | Cleaning Services, Cleaning Service |
| Astria Technologies | Montréal | Car Repair |
| Astro Jet Service (1973) | Montréal | Building Exterior Cleaning |
| Astucemédia Inc | Montréal | Computer Graphics Design & Animation |
| Asus | Montréal | Computer & Technology Assistance Programs |
| Atanaze Entretien Ménager | Montréal | Cleaning Services, Cleaning Service |
| Atelier Babachic | Montréal | Antique Restoration, Refinishing & Repair |
| Atelier De Bois | Montréal | Antique Restoration, Refinishing & Repair |
| Atelier de Débosselage Gilles Ltée | Verdun | Auto Body Repair & Painting Shops |
| Atelier De L'Auto Paolo & Dominic | Pointe-Aux-Trembles | Car Repair |
Publicité (Desktop) Publicité (Mobile) |
| Atelier De Mecanique C P | Montréal | Auto Body Repair & Painting Shops |
| Atelier de Mécanique Autocam 6592 Bombardier | Saint-Léonard | Car Repair |
| Atelier de Réparation Roméo Enr | Montréal | Appliance Repair & Service |
| Atelier De Tapis Persans Et Orientaux | Montréal | Carpet & Rug Cleaning |
| Atelier Drivetech Inc | Saint-Léonard | Car Repair |
| Atelier Du Presse-Citron | Montréal | Computer Graphics Design & Animation |
| Atelier Flowrider Mécasport | Châteauguay | Boat Repair & Maintenance |
| Atelier M.C AutoXpert | Montréal | Car Repair |
| Atelier Mécanique C.M.S. inc. Certifié Auto Service | Saint-Léonard | Auto Repair Garages |
| Atelier Mécanique D'Automobiles Multi-Tech Inc | Montréal | Car Repair |
Publicité (Desktop) Publicité (Mobile) |
| Atelier Mécanique Desro Inc | Repentigny | Transmission Repair |
| Atelier Mécanique VéREc | Saint-Hubert | Auto Repair Garages |
| Atelier Nettoyage CO-Vac SENC | Montréal | Carpet & Rug Cleaning |
| Atelier St Ferdinand Enr | Montréal | Car Repair |
| Atelier Yves Contant | Mirabel | Appliance Manufacturers & Wholesalers, Appliance Parts & Supplies, Appliance Repair & Service |
| Ateliers G Paquette Inc | Repentigny | Appliance Repair & Service, Tout Commerces au détail |
| Ateliers Nelson | Montréal | Appliance Repair |
| Ateliers réparations électroménagers MM | Montréal | Appliance Repair |
| Atlantis Pompe & Filtration | Saint-Léonard | Chemical & Steam Cleaning Systems |
| Atlas Building Services Ltd | Brossard | Cleaning Services, Cleaning Service |
Publicité (Desktop) Publicité (Mobile) |
| Atlas Froid Inc | Montréal | Appliance Repair |
| Atomikk Entretien | Montréal | Cleaning Services, Cleaning Service |
| Atomique Multiplicité | Saint-Jérôme | Computer Repair & Cleaning |
| Atwater Library and Computer Centre | Centre-Ville | Tout Enseignement et savoir, Tout Informatique et internet |
| Au Garage | Montréal | Car Repair |
| AugureNet | Montréal | Computer Networking |
| Austin Cleaning Services | Verdun | Cleaning Services, Cleaning Service |
| Austin Cleaning Services / Austin Service de Nettoyage | Montréal | Cleaning Services, Cleaning Service |
| Auto 37 | Montréal | Car Repair |
| Auto Arizona Inc | Montréal | Car Repair |
