| 9141-2148 Québec Inc | Westmount | Cleaning Services, Cleaning Service |
| Abe & Mary's | Montréal | Boutiques |
| ABP Consultants en personnel | Westmount | Tout Entreprises et services |
| Abra-Dhesif Inc | Saint-Bruno | Abrasives |
| 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 |
| Action Sport Physio | Westmount | Tout Entreprises et services, Physiotherapy |
| Adam Et Eve | Montréal | Boutiques |
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| Addition Elle | Montréal | Boutiques |
| Adelman, Adam | Westmount | Boutiques |
| Adrien Yves Lighting Design | Montréal | Boutiques |
| Advanceit Financial Corp | Westmount | Computer Networking |
| Agence Emilie Moda | Montréal | Boutiques |
| Air-Therm Inc | Westmount | Plumbing |
| Ali Jeans | Montréal | Boutiques |
| Altea Furniture | Westmount | Antique Restoration, Refinishing & Repair |
| AM1280 CFMB | Westmount | Tout Médias montréalais |
| Amadea S. Kezar Physiothérapie | Westmount | Physiotherapy |
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| American Apparel | Montréal | Boutiques |
| AmorChem Holdings Inc | Montréal | Life Sciences and Health Technologies (LSHT) |
| AmorChem Therapeutics Inc | Westmount Square | Life Sciences and Health Technologies (LSHT) |
| Anation | Montréal | Boutiques |
| Andrea Flütsch | Westmount | Physiotherapy |
| Angkor Pich Boutique | Montréal | Boutiques |
| Antiquites Coach House Enr | Westmount | Antique Dealers |
| Aplast Canada Inc | Westmount | Home Improvement |
| Application Siriz | Montréal | Boutiques |
| Applications Glue Inc, Les | Montréal | Boutiques |
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| AquaExpert | Westmount | Aquariums & Supplies |
| Arden Holdings Inc | Montréal | Boutiques |
| Aritmetik | Brossard | Boutiques |
| Armada par Men's Room | Quartier Latin Et Centre-Sud | Tout Commerces au détail |
| Artgold Fine Art Inc | Westmount | Antique Dealers |
| Asamae | Brossard | Boutiques |
| 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 Éditeurs de Langue... | Westmount | Tout Entreprises et services |
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| atelier b | Montréal | Boutiques |
| 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 |
| Atelier-boutique Femme Mécanique Designs | Montréal | Boutiques |
| Atrium Innovations Inc. | Westmount | Agri-food |
| Aubainerie Entrepôt | Montréal | Boutiques |
| Avataq Institut Culturel | Westmount | Arts & Cultural Organizations & Centres |
| Avenue Des Arts | Westmount | Art Materials & Supplies |
| Axion Acupuncture Clinic | Westmount | Acupuncturists |
