| Align Aerospace | Boucherville | Aviation Consultants & Services |
| Alimentation Raymond Drouin Inc | Longueuil | Not Profit, Grocery Stores |
| Alkalima Christian Store | Montréal | Not Profit, library |
| Alliages Unifiés | Dorval | Tout Entreprises et services |
| Allied Universal Security Services | Dorval | Tout Entreprises et services |
| Alphacasting Inc. | Montréal | Aerospace, Tout Entreprises et services |
| ALSIM | Montréal | Aerospace |
| Alta Material Handling | Dorval | Tout Entreprises et services |
| ALTA PRÉCISION INC. | Anjou | Aerospace |
| ALTITUDE AEROSPACE | Montréal | Aerospace |
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| Altitude Aerospace Inc | Montréal | Aircraft Maintenance, Service & Storage |
| Altitude Aerospace Inc | Montréal | Aircraft Maintenance, Service & Storage |
| Altrom/Auto-Camping - Dorval | Dorval | Auto Body Shop Equipment & Supplies |
| ALUBOX (DIVISION DE JE LORTIE COMPAGNIE LTÉE) | Montréal | Aerospace |
| Amacor Marketing | Dorval | Tout Commerces au détail |
| Amber Esthetics & Makeup Studio | Dorval | Beauty & Fitness, Hairdressers & Beauty Salons |
| Amcor | Dorval | Tout Entreprises et services |
| AMEC AMÉRIQUES LIMITÉE | Dorval | Life Sciences and Health Technologies (LSHT) |
| Amenzone Fitness | Dorval | Fitness Gyms |
| American Airlines | Dorval | Airlines |
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| AMESYS | Montréal | Aerospace |
| Ameublement Euro Style | Dorval | Tout Commerces au détail |
| Ameublements De Bureau Intrtch | Dorval | Furniture Stores |
| AMG Auto-Mécanique | Montréal | Auto Repair Garages, Not Profit, Car Repair |
| AMPHENOL AIR LB NORTH AMERICA INC. | Saint-Hubert | Aerospace |
| AMRIKART R.C. INC. | Boucherville | Aerospace |
| AMS Physiotherapy & Rehabilitation Centre | Dorval | Physiotherapy |
| Anodisation Montréal Inc | Dorval | Anodizing |
| AP&C Revêtements et Poudres Avancées | Montréal | Aerospace |
| AP&C Revêtements et Poudres Avancées | Montréal | Aerospace |
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| Aqua Performa | Dorval | Fitness Gyms |
| AQUACOUPE TECHNOLOGY INC. | Mirabel | Aerospace |
| ARA robotique | Montréal | Information Technologies (IT) |
| Archives municipales | Montréal | Not Profit, library |
| Arctic Glacier | Dorval | Tout Entreprises et services |
| Ares Cuisine Head Office | Dorval | Appliance Manufacturers & Wholesalers |
| Armolan Furniture | Dorval | Cabinet Makers |
| Arrondissement de Lachine | Lachine | Not Profit, library |
| Arrondissement Verdun | Verdun | Not Profit, library |
| Arrow Electronics | Dorval | Tout Entreprises et services |
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| ARTEC TECHNOLOGIES | Montréal | Aerospace |
| Artothèque De Montréal | Montréal | Not Profit, Tout Arts et divertissement, library |
| ASCO Valve Canada | Dorval | Tout Entreprises et services |
| Association des Bibliothécaires du Québec | Beaconsfield | Not Profit, library |
| ASSYSTEM PRODUCT ENGINEERING CANADA | Montréal | Aerospace |
| ATD DESIGN SERVICES (4071468 CANADA INC.) | Sainte-Geneviève | Aerospace |
| Atelier Centre Du Pneu Groupe Unik | Dorval | Tire Shop |
| Auberge du Dragon Rouge | Montréal | Automobiles, Not Profit, Restaurants |
| Auberge St-Louis | Dorval | Apartment Hotels |
| Audionova Inc. | Dorval | Tout Commerces au détail |
