| 1230 Électroniques | Lachine | Computer Repair & Cleaning |
| 123inkcartridges.ca | Lachine | Camera & Photo Equipment Stores |
| 9132-1000 Québec Inc | Lachine | Business & Trade Organizations |
| 9334-4349 Quebec Inc | Lachine | Pizza & Pizzerias |
| A A et Fils | Montréal | Flooring |
| A Asselin & Fils Inc | Lachine | Plumbing |
| A Pex Discount Inc | Lachine | Bedding & Linens |
| A. Picard & Fils Inc | Laval | Tire Shop |
| Aai Encanteurs Assoc Intl | Lachine | Auctions |
| Abu-Lasia/ Matamin | Lachine | Baked Goods Wholesalers |
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| Accessoires Rose Blanche | Lachine | Bakery Equipment, Bakery Supplies |
| Accord Expositions | Lachine | Tout Entreprises et services |
| Acier Lachine Inc | Lachine | Aluminum |
| ADI Global Distribution | Lachine | Tout Entreprises et services |
| ADM Canada | Lachine | Tout Entreprises et services |
| Affiliated Sport Group | Lachine | Tout Entreprises et services |
| Agence Imapro Inc | Lachine | Business & Trade Organizations |
| AIDA Distribution | Lachine | Beverage Distributors & Bottlers |
| Air Pro Transport 2009 | Lachine | Air Cargo Service |
| Alain Normandin Rénovation | Lachine | Home Improvement |
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| Alex Berthiaume Et Fils | Vimont | All-Terrain Vehicles |
| Alexandre & fils | Centre-Ville | Tout Bars et restaurants |
| Alexandre et fils | Montréal | Breakfast Restaurants |
| Aliments Morehouse Canada Inc | Lachine | Agri-food |
| Aliments T & N (Les) | Lachine | Agri-food |
| Allstream | Lachine | Information Technologies (IT), Tout Entreprises et services, Tout Informatique et internet |
| Alongi | Lachine | Tout Commerces au détail, Tout Entreprises et services |
| Aluminium Adm et Fils | Laval | Aluminum |
| Aluminium C Bouchard & Fils Inc | Terrebonne | Aluminum Products |
| Always B Clean | Lachine | Home Improvement |
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| AMD Ritmed Inc. | Québec | Life Sciences and Health Technologies (LSHT) |
| AMJ Campbell Van Lines | Lachine | Tout Entreprises et services |
| Aménagement Denis & Fils | Montréal | Landscaping |
| Aménagement Denis & Fils Inc | Outremont | Landscaping |
| Andrew & Friends - 90 Day Challenge | Lachine | Beauty Salon Equipment & Supplies |
| Anixia | Lachine | Calendars |
| Annie Cyr Conseillère Indépendante Scentsy | Lachine | Aromatherapy |
| AP Toitures et Fils | Montréal | Roofing |
| Aquino & Fils Inc Entreprises | Saint-Léonard | Tout Entreprises et services |
| ARCHIVES IRON MOUNTAIN | Lachine | Information Technologies (IT) |
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| Arena Pizzeria | Lachine | Pizza & Pizzerias |
| Arena Tasty Pizzeria Lachine Restaurant | Lachine | Pizza & Pizzerias |
| Armoires de Cuisine Bélanger et Fils Inc | Montréal | Kitchen Cabinets |
| Arrondissement de Lachine | Montréal | Tout Informations générales |
| Arrondissement de Lachine | Lachine | Not Profit, library |
| Art Forge | Lachine | Art Foundries |
| Arturo Dilonardo et Fils | Montréal | Landscaping |
| Ashley's Little Gift Shop | Lachine | Candles |
| Association des Techniciens en Sant... | Lachine | Tout Entreprises et services |
| Assurance123.ca | Lachine | Tout Entreprises et services |
