| Centre Dentaire Pizem Westmount Inc Dr | Montréal | Dentists |
| Centre Greene | Westmount | Tout Communautés et société |
| Centre médical Westmount | Westmount | Tout Entreprises et services |
| Centre Médical Westmount | Montréal | Medical Clinics |
| Centre Médical Westmount Square | Westmount | Medical Clinics |
| CenturyLink Technology Solutions | Montréal | Information Technologies (IT) |
| Certo Solutions | Saint-Léonard | Tout Informatique et internet |
| Charlotte & Gabrielle | Westmount | Clothing Stores |
| Chertkow, Howard | Westmount | Health Services |
| Cheveux Extrêmes Inc | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
Publicité (Desktop) Publicité (Mobile) |
| Cheveux Extrêmes/Extreme Hair | Westmount | Beauty Salon Equipment & Supplies |
| Chez Nick | Westmount | Tout Bars et restaurants |
| Chubikphysio | Westmount | Physiotherapy |
| Clinique Dentaire Claremont | Westmount | Dentists |
| Clinique dentaire NDG-Westmount | Notre-Dame-De-Grâce | Tout Entreprises et services |
| Clinique Esthétique Et Coiffure Dermadiba | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
| Clinique Intersanté Westmount | Westmount | Health Services |
| Clinique Mocca | Westmount | Health and Beauty |
| Club de Boulingrin de Westmount Lawn Bowling C lub | Westmount | Bowling |
| CMP Solutions Mécaniques Avancées | Chateauguay | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Coach Luxury | Westmount | Tout Commerces au détail |
| Coiffure Jean John | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
| Coin Solutions Affaires | Saint-Léonard | Bookkeeping Software & Accounting Systems |
| Collage Pediatric Therapy | Westmount | Medical Clinics |
| Collège International de Marcelline | Westmount | Tout Enseignement et savoir |
| Collège Unica | Westmount | Tout Enseignement et savoir |
| Communicor | Westmount | Advertising Agencies |
| Compta Solutions | Montréal | Chartered Professional Accountants (CPA) |
| Comptabilite Solutions | Montréal | Bookkeeping Software & Accounting Systems |
| Corbin Therapeutics Inc. | Square | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Corbin thérapeuthique | Montréal | Life Sciences and Health Technologies (LSHT) |
| Cornell Trading Ltd. | Westmount | Tout Commerces au détail |
| Corporate Promotion Solutions | Montréal | Calendars |
| Corporatek | Westmount | Tout Informatique et internet |
| Corporation Financiere MR | Westmount | Tout Entreprises et services |
| Crowe BGK | Westmount | Tout Entreprises et services |
| Curotic Solutions Inc. | Claudel | Life Sciences and Health Technologies (LSHT) |
| D&M Solutions Comptables Inc | Saint-Léonard | Accounting Services |
| Davicci | Westmount | Boutiques |
| Dawson College | Westmount | Tout Enseignement et savoir |
Publicité (Desktop) Publicité (Mobile) |
| Decarel Inc. | Westmount | Tout Entreprises et services |
| DELAN - Solutions de Talents TI | Montréal | Tout Entreprises et services |
| Dempton Solutions Technologiques Inc | Montréal | Computer Consultants |
| Dermatologie Skin and Hair Solutions | Montréal | Health and Beauty |
| Deutschman Design Inc. | Westmount | Tout Entreprises et services |
| DG Entertainment | Westmount | Tout Enseignement et savoir, Tout Entreprises et services |
| Dh Tingley | Westmount | dh |
| Direct Impact Solutions | Pont-Viau | Tout Informatique et internet |
| Dlux Design Concepts | Westmount | Fitness Gyms |
| Domino Printing Solutions Inc | Montréal | Information Technologies (IT) |
