| Co-Cathedral of Saint-Antoine-de-Padoue | Churches & Other Places of Worship | facebook.com |
| Cofa Inc | Compressors | facebook.com |
| Coiffure Aphrodite | Beauty & Fitness, Hairdressers & Beauty Salons | competencebeaute.com |
| Coiffure Boivin Inc | Barbers, Beauty & Fitness, Men's Hairdressers & Barber Shops | facebook.com |
| Coiffure Christine | Beauty & Fitness, Hairdressers & Beauty Salons | studiodecoiffurechri.salonpages.ca |
| Coiffure Coup D'Eclat | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Coiffure Elegance Plus | Barbers, Men's Hairdressers & Barber Shops | — |
| Coiffure Extra Coupe | Beauty & Fitness, Hairdressers & Beauty Salons | coiffureds.com |
| Coiffure Le Bon Sens | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Coiffure Léopold Elle & Lui | Barbers, Men's Hairdressers & Barber Shops | — |
| Coiffure Léopold Enr | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Coiffure Mailissa | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Coiffure Maryse Racine | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Coiffure Metro-Longueuil 2002 | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Coiffure Millenium | Beauty & Fitness, Hairdressers & Beauty Salons | milleniumcoiffure.com |
| Coiffure Mobilité | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Coiffure Salon Urbain | Beauty & Fitness, Hairdressers & Beauty Salons | salonurbain.blogspot.com |
| Coiffure Spa Nouveau Regard | Beauty & Fitness, Hairdressers & Beauty Salons | coiffurespanouveauregard.com |
| Colarôme Inc. | Agri-food, Tout Entreprises et services | colarome.com |
| Colisée Jean Béliveau | Auditoriums & Halls, Banquet Rooms | facebook.com |
| Collectif de défense des droits de... | Tout Communautés et société | cddm.qc.ca |
| COLLÈGE FRANÇAIS | Blue Pages, Education / Career | — |
| Collège Charles-Lemoyne | Tout Enseignement et savoir | monccl.com |
| Collège Notre-Dame-de-Lourdes | Tout Enseignement et savoir | ndl.qc.ca |
| Colo rive-sud | Information Technologies (IT) | colorivesud.ca |
| Colo-D2 | Information Technologies (IT) | colod.com |
| Coly Mousses | Children's Clothing Stores | — |
| Commercial Banking Services | Banks | locator.nbc.ca |
| Communication Swans | Audiovisual Production Services | — |
| Communication TÉcosystème Startup / Capital de risque (Venture capital) [39] Canada | Information Technologies (IT) | técosystème startup |
| Communications Swan | Audiovisual Production Services | — |
| Complexe St-Charles Inc | Business Centres | facebook.com |
| Compo-Pub DBP Inc | Brasseries | — |
| Comptabilité C G | Bookkeeping Software & Accounting Systems | comptabilitecg.com |
| Comptabilité CG | Advertising Agencies | — |
| Comptabilité PM | Bookkeeping | — |
| Comunitatea Român? din Montérégie | Community Service & Charitable Organizations | facebook.com |
| Conseil de développement du camping... | Tout Tourisme et hôtels | campingquebec.com |
| Conseil québecois des ressources hu... | Tout Tourisme et hôtels | cqrht.qc.ca |
| Conseil Régional de l'Environnement de la Montérégie | Community Service & Charitable Organizations | facebook.com |
| Conseilsantevoyage.Com | Beer & Ale | facebook.com |
| Construction Bizz Inc. | Tout Entreprises et services | excavationbizz.com |
| Construction Boisjoli - Entrepreneur Général, rénovation et construction commerciale Longueuil | Bathroom Renovations | 411habitation.com |
| Contact Delage Inc. | Tout Entreprises et services | contactdelage.com |
| Conway Jacques | Shopping Mall | — |
| Coop D'Habitation Portes De L'Espoir | Co-operative Organizations | — |
| Coop Place Du Collège | Co-operative Organizations | placeducollege.coop |
| Coopérative D'Habitation Le Chalutier | Co-operative Organizations | facebook.com |
| Coopérative Le Sommet | Co-operative Organizations | — |
| Coordination Maxi | Not Profit, Grocery Stores | — |
