| 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 |
| Accenture | Montréal | Information Technologies (IT) |
| ACCEO Solutions | Montréal | Information Technologies (IT), Tout Informatique et internet |
| Acier Wirth Steel | Westmount | Aluminum |
| Action Sport Physio | Westmount | Tout Entreprises et services, Physiotherapy |
| Adelman, Adam | Westmount | Boutiques |
Publicité (Desktop) Publicité (Mobile) |
| ADP Canada R-L | Montréal | Information Technologies (IT) |
| Advanceit Financial Corp | Montréal | Computer Networking |
| Advanceit Financial Corp | Westmount | Computer Networking |
| Air-Therm Inc | Westmount | Plumbing |
| Altea Furniture | Westmount | Antique Restoration, Refinishing & Repair |
| AM1280 CFMB | Westmount | Tout Médias montréalais |
| Amadea S. Kezar Physiothérapie | Westmount | Physiotherapy |
| AmorChem Holdings Inc | Montréal | Life Sciences and Health Technologies (LSHT) |
| AmorChem Therapeutics Inc | Westmount Square | Life Sciences and Health Technologies (LSHT) |
| Andrea Flütsch | Westmount | Physiotherapy |
Publicité (Desktop) Publicité (Mobile) |
| Antiquites Coach House Enr | Westmount | Antique Dealers |
| Aplast Canada Inc | Westmount | Home Improvement |
| AquaExpert | Westmount | Aquariums & Supplies |
| Ari Financial Services Inc | Laval | Car Leasing |
| Artgold Fine Art Inc | Westmount | Antique Dealers |
| Aspler Joseph Jutras Inc | Westmount | Car Insurance |
| Assemblée Quaker de Montréal | Westmount | Tout Communautés et société |
| Assima Canada / Wizart Canada | Montréal | Information Technologies (IT) |
| Association des Médecins omnipratic... | Westmount | Tout Communautés et société |
| Association des Éditeurs de Langue... | Westmount | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| 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 |
| Avataq Institut Culturel | Westmount | Arts & Cultural Organizations & Centres |
| Avenue Des Arts | Westmount | Art Materials & Supplies |
| Axion Acupuncture Clinic | Westmount | Acupuncturists |
| Babar En Ville | Westmount | Book Stores |
| Bagels on Greene | Westmount | Bagels |
| BancTec Canada | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Bantam Materials International | Westmount | Chemicals |
| Baron Abrams | Westmount | Business Lawyers |
| Baron Realty / Immobilier Baron | Westmount | Tout Entreprises et services |
| Ben & Tournesol | Westmount | Tout Commerces au détail |
| Benson Joan | Westmount | Business Lawyers |
| Bibliothèque publique de Westmount | Westmount | Tout Enseignement et savoir |
| Bishop Mercier | Westmount | Roofing |
| Bitcoin Embassy | Montréal | Information Technologies (IT) |
| Blepharoplastie Montreal | Westmount | Tout Entreprises et services |
| Blockstream | Montréal | Information Technologies (IT) |
