| 2760-0352 Quebec Inc | Outremont | Cakes |
| 900 Rockland | Outremont | Apartments |
| 9141-2148 Québec Inc | Westmount | Cleaning Services, Cleaning Service |
| ABP Consultants en personnel | Westmount | Tout Entreprises et services |
| ABZ Assurances-Insurance | Westmount | Car Insurance |
| ACA | Westmount | Collection Agencies |
| Académie Ballet Flamenco Lina Moros | Westmount | Tout Enseignement et savoir |
| Acier Wirth Steel | Westmount | Aluminum |
| Acimovic m | Outremont | Apartments |
| Action Sport Physio | Westmount | Tout Entreprises et services, Physiotherapy |
Publicité (Desktop) Publicité (Mobile) |
| Adelman, Adam | Westmount | Boutiques |
| Advanceit Financial Corp | Westmount | Computer Networking |
| Ai-Tuyet Luong-Si | Outremont | si |
| Air-Therm Inc | Westmount | Plumbing |
| Alexandre Ltée | Côte-Des-Neiges | Tout Entreprises et services |
| Altea Furniture | Westmount | Antique Restoration, Refinishing & Repair |
| AM1280 CFMB | Westmount | Tout Médias montréalais |
| Amadea S. Kezar Physiothérapie | Westmount | Physiotherapy |
| Amesos Plumbing | Outremont | Plumbing |
| AmorChem Holdings Inc | Montréal | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| AmorChem Therapeutics Inc | Westmount Square | Life Sciences and Health Technologies (LSHT) |
| Amour des thés | Outremont | Tout Commerces au détail |
| Aménagement Denis & Fils Inc | Outremont | Landscaping |
| Andrea Flütsch | Westmount | Physiotherapy |
| Antiquites Coach House Enr | Westmount | Antique Dealers |
| Aplast Canada Inc | Westmount | Home Improvement |
| AquaExpert | Westmount | Aquariums & Supplies |
| Aquarium ASP Inc | Outremont | Aquariums & Supplies |
| Aquila Communications Inc. | Montréal | Tout Entreprises et services |
| Arbitrage JLH SA | Outremont | Arbitration Service |
Publicité (Desktop) Publicité (Mobile) |
| Arbutus Records | Outremont | Tout Entreprises et services |
| Ariane Éditions | Outremont | Tout Entreprises et services |
| Artgold Fine Art Inc | Westmount | Antique Dealers |
| As Silverman | Outremont | as |
| Aspler Joseph Jutras Inc | Westmount | Car Insurance |
| Assemblée Quaker de Montréal | Westmount | Tout Communautés et société |
| Association des Médecins omnipratic... | Westmount | Tout Communautés et société |
| Association des piétons et cyclistes d'Outremont | Montréal | Tout Arts et divertissement, Tout Informations générales |
| Association des Éditeurs de Langue... | Westmount | Tout Entreprises et services |
| Association Québécoise des Agences... | Outremont | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Association québécoise des marionnettistes | Outremont | Tout Arts et divertissement, Tout Entreprises et services |
| Atelier 10 | Petite-Patrie | Tout Commerces au détail, Tout Entreprises et services |
| Atelier Blow | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
| Atelier de Serrures Martin's Swiss | Westmount | Bicycle Stores |
| Atelier Scissor House | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
| Atrium Innovations Inc. | Westmount | Agri-food |
| Au 2 Coiffure | Outremont | Beauty & Fitness, Hairdressers & Beauty Salons |
| Au Printemps | Outremont | Closet Organizers & Accessories |
| Avataq Institut Culturel | Westmount | Arts & Cultural Organizations & Centres |
| Avenue Des Arts | Westmount | Art Materials & Supplies |
