| Centre Sportif Collège Edouard-Montpetit | Fitness Gyms | facebook.com |
| Centres dentaires Lapointe | Dentists | centreslapointe.com |
| Centres Dentaires Lapointe - Longueuil /St-Laurent | Dentists | — |
| Centres Dentaires Lapointe Inc | Dentists | facebook.com |
| Centronature Longueuil | Massage Therapy | — |
| Cercles de Fermières du Québec | Tout Communautés et société | cfq.qc.ca |
| Cerec Inc | Dentists | — |
| Cerodem Céramiques Ltée | Ceramic Tile Manufacturers & Distributors | cerodem.ca |
| Chambre de Commerce et Industrie de... | Tout Entreprises et services | ccirs.qc.ca |
| Charlot Fleurs & Cadeaux | Baskets | charlotfleuriste.com |
| chatr Mobile | Answering Machines & Equipment | — |
| Chaussures Laforest Ltee | Boots | chaussureslaforest.com |
| Chemania | Boots | facebook.com |
| Chevalier Equipement De Restaurant | Commercial Kitchen Equipment | — |
| Chinto Shop | Cakes | — |
| Chiropratique Chantal Pinard | Chiropractors | — |
| Chiropratique Sacré-Coeur | Chiropractors | chiropratiquesacre-coeur.ca |
| Chocolat Marie Pommette | Chocolate | — |
| Chocolat Perfection Inc | Chocolate | — |
| Chocolat Perfection Inc. | Tout Entreprises et services | perfection.ca |
| Chocolaterie Rive Sud | Chocolate | fleuristerivesud.com |
| Choeur Classique de Montréal | Tout Arts et divertissement | choeurclassiquedemontreal.qc.ca |
| Chouinard Hélène Dr | Health Services | facebook.com |
| Choyez vos Pieds - Podologue en Soins de Pieds Professionnelle | Chiropodists | — |
| Christian Couture | Couture, COUTURE | — |
| Christina Bella | Clothing Stores | — |
| Chrysalide Institut De Sante | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Chrystal Construction | Bathroom Renovations | — |
| CIBC Branch with ATM (Cash at ATM only) | Banks | locations.cibc.com |
| Ciment Extrême Inc | Cement Dealers | — |
| CIngenito-Comptabilité et al. | Accountants | cingenito.ca |
| Cité Boomers | Tout Communautés et société | citeboomers.com |
| Claude Leveille Automobiles | Auto Body Repair & Painting Shops | — |
| Clemex Technologies | Tout Informatique et internet | clemex.com |
| Clemex Technologies inc. | Life Sciences and Health Technologies (LSHT) | clemex.com |
| Clhoe | Beauty & Health Spas | facebook.com |
| Clicnet Télécommunications Inc | Information Technologies (IT) | clic.net |
| ClicShop | Tout Informatique et internet | clicshop.com |
| Clim Air Dépôt | Air Conditioning Contractors | — |
| Climatisation Chauffage Gladu | Air Conditioning Contractors | — |
| Clinique Alna | Massage Therapy | cliniquealna.com |
| Clinique Alternative De Longueuil | Massage Therapy | — |
| Clinique Atma | Tout Entreprises et services, Massage Therapy | cliniqueatma.com |
| Clinique Auto Longueuil Inc | Auto Services | facebook.com |
| Clinique Aveata | Massage Therapy | aveata.ca |
| Clinique Chiroaxion | Chiropractors | facebook.com |
| Clinique Chiropratique Chantal Pinard. | Chiropractors | cliniquechantalpinard.ca |
| Clinique Chiropratique L'Optimum | Chiropractors | cliniquechiropratiqueloptimum.com |
| Clinique Chiropratique Pierre-Boucher | Chiropractors | chiropb.com |
| Clinique Concept Physique Sante | Massage Therapy | ciblelocale.ca |
