| Coiffure Esthetique Brunette | Pointe-Claire | Beauty & Fitness, Hairdressers & Beauty Salons |
| Coiffure Illusion Enr | Pointe-Calumet | Beauty & Fitness, Hairdressers & Beauty Salons |
| Coiffure La Pointe aux 4 Vents | Boucherville | Beauty & Fitness, Hairdressers & Beauty Salons |
| Coiffure Vivalis | Pointe-Claire | Beauty & Fitness, Hairdressers & Beauty Salons |
| Cole Freight Inc. | Pointe-Claire | Tout Entreprises et services |
| Colonial Elegance | Montréal | Tout Entreprises et services |
| Combustible | Montréal | Computer Networking |
| Comfort Inn Montreal Aeroport | Pointe-Claire | Tout Tourisme et hôtels |
| Comité ZIP Jacques-Cartier | Montréal | Tout Entreprises et services |
| Commerce Montex | Montréal | Computer Room Setup, Protection, Equipment & Maintenance |
Publicité (Desktop) Publicité (Mobile) |
| Commerce xp Eastern Canada | Pointe-Claire | Auctions |
| Commission des Services Electriques de Montréal | Montréal | Cable TV Providers |
| Communitec | Saint-Hubert | Cable Installation, Splicing & Detection |
| Compagnie Bicc General Cable | Saint-Jérôme | Cabling Equipment & Supplies |
| Compagnie Bonbon Rio Inc, La | Pointe-Aux-Trembles | Agri-food |
| Compagnie Gillette Canada | Pointe-Claire | Tout Entreprises et services |
| Compumatik | Montréal | Computer Repair & Cleaning |
| Computer sciences corporation | Montréal | Information Technologies (IT) |
| Computershare Trust Company of Canada | Montréal | Information Technologies (IT) |
| Conception Tekni-B | Brossard | Computer & Technology Assistance Programs |
Publicité (Desktop) Publicité (Mobile) |
| Concordia Physio Sport - Pointe-Claire | Pointe-Claire | Physiotherapy |
| Concordia Physio Sport- Pointe Claire Village | Pointe-Claire | Physiotherapy |
| Connect&Go | Outremont | Computer Networking |
| Consolidated Bottle Company | Pointe-Claire | Tout Entreprises et services |
| Consolidated Bottle Corporation | Pointe-Claire | Bottles & Jars |
| Consolidated Bottle Corporation | Pointe-Claire | Bottles & Jars |
| Construction JN Inc | Pointe-Aux-Trembles | Home Improvement |
| Consulmac | Toronto | Computer Repair & Cleaning |
| Convergia Inc. | Pointe-Claire | Tout Entreprises et services, Tout Informatique et internet |
| Copart | Montréal | Tout Commerces au détail |
Publicité (Desktop) Publicité (Mobile) |
| Copiscope | Longueuil | Computer Accessories & Supplies |
| Corporation Mainbourg | Pointe-Aux-Trembles | Tout Communautés et société, Caterers |
| Couvreur Rheaume Lajeunesse Inc | Pointe-Calumet | Roofing |
| Couvreur Verdun Inc | Pointe-Aux-Trembles | Roofing |
| Couvreur Verdun Roofing Inc. | Montréal | Tout Entreprises et services |
| Covidien Canada | Pointe-Claire | Life Sciences and Health Technologies (LSHT) |
| CPAP Montreal Respiart | Pointe-Claire | Tout Commerces au détail |
| CPE Pierrot La Lune, SiègeSocial,InstallationArlequin | Longueuil | Childcare Services |
| Crazy about CupCakes | Pointe-Claire | Tout Commerces au détail |
| Creative Imaging | Montréal | Computer Graphics Design & Animation |
Publicité (Desktop) Publicité (Mobile) |
| Cristal Plus Inc. | Pointe-Claire | Cleaning Services, Cleaning Service |
| Créations Plastique Formplast Inc. | Montréal | Tout Entreprises et services |
| CSA Group | Pointe-Claire | Tout Entreprises et services |
| CST Consultants | Montréal | Computer Consultants |
| Cuisine Set Inc | Pointe-Aux-Trembles | Kitchen Cabinets |
| Cummins Est du Canada Inc. | Pointe-Claire | Tout Entreprises et services |
| CVDS INC. | Pointe-Claire | Aerospace |
| Cyberlogic | Montréal | Computer Repair & Cleaning |
| Cyberlogic | Montréal | Computer Repair & Cleaning |
| Câblage Dynamique Inc | Montréal | Cable TV Providers |
