| Casewise Opérations Canada Inc | Montréal | Information Technologies (IT) |
| Castor Technologies Corporation | Montréal | Computer & Technology Assistance Programs |
| Celltechs | Montréal | Computer Consultants |
| Centre D'Action Bénévole Du Grand Châteauguay | Châteauguay | Arts & Cultural Organizations & Centres |
| Centre de santé et de services sociaux Jardins-Roussillon | Châteauguay | Medical Clinics |
| Centre LOL En Fête | Châteauguay | Balloons |
| Centre Medical MED | Châteauguay | Medical Clinics |
| Centre Médical Mercier-Châteauguay | Châteauguay | Medical Clinics |
| Centre Régional Châteauguay | Châteauguay | Shopping Malls, Shopping Mall |
| Centre Santé Desjardins | Châteauguay | Medical Clinics |
Publicité (Desktop) Publicité (Mobile) |
| CenturyLink Technology Solutions | Montréal | Information Technologies (IT) |
| Cesmic Group Ltd | Brossard | Computer Room Setup, Protection, Equipment & Maintenance |
| CFMB 1280 AM/ M. TELLIDES | Montréal | Blue Pages |
| CGI | Montréal | Information Technologies (IT), Tout Informatique et internet, Computer Networking, Computer Consultants |
| Charpentier Daniel | Châteauguay | Bankruptcy Lawyers |
| CHATEAUGUAY | Chateauguay | Blue Pages |
| Chateauguay Chevrolet | Châteauguay | Tout Commerces au détail |
| Chatô Enr. | Châteauguay | Tout Commerces au détail |
| Christie Pilates | Châteauguay | Fitness Gyms |
| Châteauguay Regional Shopping Centre | Châteauguay | Shopping Malls, Shopping Mall |
Publicité (Desktop) Publicité (Mobile) |
| Cinq Etoile Centre Service Lave Auto Inc | Châteauguay | Car Detailing |
| CITP Database Services | Montréal | Computer Data Processing |
| CKDG | Montréal | Blue Pages |
| CLG Computer Consultants Inc. | Saint-Henri | Tout Entreprises et services |
| Clicpomme | Montréal | Tout Informatique et internet, Computer Consultants |
| Clinique Chiropratique Mercier-Chateauguay | Mercier | Chiropractors |
| Clinique De Vaccination Rive-Sud | Châteauguay | Medical Clinics |
| Clinique Médicale Châteauguay | Châteauguay | Medical Clinics |
| Clinique ORL de la Montérégie | Châteauguay | Medical Clinics |
| CliqueIA Tech INC | Montréal | Computer Consultants |
Publicité (Desktop) Publicité (Mobile) |
| Cloudops | Montréal | Tout Informatique et internet, Computer Consultants |
| CloudOps | Montréal | Computer Consultants |
| CloudOps | Montréal | Computer Repair & Cleaning |
| Club PVRH Centre d'Assistance Resso... | Brossard | Tout Entreprises et services |
| Clé en main Informatique | Montréal | Computer Networking |
| CMP Solutions Mécaniques Avancées | Chateauguay | Tout Entreprises et services |
| Cmyktoner | Côte Saint-Luc | Computer Networking |
| Cna | Montréal | Computer Consultants |
| Co-operators Compagnie d'Assurance | Montréal | Information Technologies (IT) |
| Cocoapp | Montréal | Computer Consultants |
Publicité (Desktop) Publicité (Mobile) |
| Cogia | Montréal | Computer Consultants |
| Coin Acceptors Inc | Montréal | Information Technologies (IT) |
| Combustible | Montréal | Computer Networking |
| Commerce Montex | Montréal | Computer Room Setup, Protection, Equipment & Maintenance |
| Compagnie de Recyclage de Papiers MD Inc | Châteauguay | Life Sciences and Health Technologies (LSHT) |
| 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 |
| Connect&Go | Outremont | Computer Networking |
