| 2 Sorelle Gelato | Saint-Lambert | Not Profit, Grocery Stores |
| 9092-1032 Qué Inc | Saint-Lambert | Accounting Services |
| 9141-2148 Québec Inc | Westmount | Cleaning Services, Cleaning Service |
| Abdel Wajed Doumi El Baqqali | Saint-Lambert-De-Lauzon | el |
| Abe & Mary's | Montréal | Boutiques |
| 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 |
| Accent Chiropratique | Saint-Lambert | Tout Entreprises et services, Chiropractors |
Publicité (Desktop) Publicité (Mobile) |
| Achim Guy | Saint-Lambert | Accounting Services |
| Acier Wirth Steel | Westmount | Aluminum |
| Acousti-Tech | Saint-Lambert | Tout Entreprises et services |
| Action Sport Physio | Westmount | Tout Entreprises et services, Physiotherapy |
| Actuelle Chaussures | Saint-Lambert | Boots |
| Acupuncture Emmanuelle Rioux | Saint-Lambert | Acupuncturists |
| Acupuncture Emmanuelle Rioux | Saint-Lambert | Clinics |
| Adam Et Eve | Montréal | Boutiques |
| Addition Elle | Montréal | Boutiques |
| Adelman, Adam | Westmount | Boutiques |
Publicité (Desktop) Publicité (Mobile) |
| Adrien Yves Lighting Design | Montréal | Boutiques |
| Advanceit Financial Corp | Westmount | Computer Networking |
| Agence Benedictus Inc | Saint-Lambert | Communications & Public Relations Consultants |
| Agence Emilie Moda | Montréal | Boutiques |
| Agence Lumina | Saint-Lambert | Communications & Public Relations Consultants |
| Air-Therm Inc | Westmount | Plumbing |
| Aj Tardif | Saint-Lambert | aj |
| Alaby Joseph Dr | Saint-Lambert | Dentists |
| Ali Jeans | Montréal | Boutiques |
| Alpakine | Saint-Lambert | Clothing Stores |
Publicité (Desktop) Publicité (Mobile) |
| Altea Furniture | Westmount | Antique Restoration, Refinishing & Repair |
| AM1280 CFMB | Westmount | Tout Médias montréalais |
| Amadea S. Kezar Physiothérapie | Westmount | Physiotherapy |
| Ameli Artistry | Saint-Lambert | Beauty & Fitness, Hairdressers & Beauty Salons |
| 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 |
Publicité (Desktop) Publicité (Mobile) |
| Annabelle Ne | Saint-Lambert | ne |
| Annie-Claude Charlebois, Physiothérapeute | Saint-Lambert | Physiotherapy |
| Antiquites Coach House Enr | Westmount | Antique Dealers |
| Aplast Canada Inc | Westmount | Home Improvement |
| Application Siriz | Montréal | Boutiques |
| Applications Glue Inc, Les | Montréal | Boutiques |
| AquaExpert | Westmount | Aquariums & Supplies |
| Archifin (Le Groupe) | Saint-Lambert | Architects |
| Arden Holdings Inc | Montréal | Boutiques |
| Aritmetik | Brossard | Boutiques |
