| Café Terrasse 1957 | Bars, Tout Bars et restaurants | cafeterrasse1957.com |
| Café Van Houtte | Coffee Shops | cafevanhoutte.com |
| Cafés Européens Père & Fille | Coffee Stores | cafeseuropeens.com |
| Caisse Desjardins | Caisses Populaires | facebook.com |
| Caisse Desjardins du Vieux-Longueuil | Caisses Populaires | desjardins.com |
| Caisse Desjardins Pierre-Boucher - Siège social | Caisses Populaires | desjardins.com |
| Caisse Populaire De St-Charles | Caisses Populaires | facebook.com |
| Cakes & Sweets in Longueuil | Bakeries | — |
| Call It Spring | Boutiques | sothebysrealty.ca |
| Call2Blaster.Net | Business & Trade Organizations | — |
| Camp De Jour Mont Bruno | Camps | — |
| Camp System International | Camps | — |
| Camu Clinique Des Spécialistes | Medical Clinics | facebook.com |
| Can Tho Restaurant Vietnamien | Cans | facebook.com |
| Can-Ship Import Export Inc | Cans | — |
| Canadian Men International | Adult Entertainment | — |
| Canadian Payroll Association | Physiotherapy | — |
| Canevas Métropolitain | Tout Entreprises et services, Awning & Canopy Sales & Service | canevasmetropolitain.com |
| Canine Center Heidi & cie | Tout Commerces au détail | centreheidi.com |
| Carosseries Dmr Inc | Auto Body Shop Equipment & Supplies | fixauto.com |
| Carpe Diem Spa | Massage Therapy | carpediemspa.ca |
| Carrefour Sante Du Vieux | Alternative Health | facebook.com |
| Carrière Daniel Architecte | Architects | — |
| Carrosserie 1125 | Car Repair | — |
| Carrosserie Deschênes Inc | Auto Body Shop | carrosseriedeschenes.ca |
| Carrosserie Deschênes Inc | Auto Body Shop Equipment & Supplies | — |
| Carrosserie Dubwerks | Auto Body Shop | carrosseriedubwerks.ca |
| Carrosserie Ferrazza M S Inc | Auto Body Repair & Painting Shops | facebook.com |
| Carrosserie Longueuil | Auto Body Repair & Painting Shops | facebook.com |
| Carrosserie Metro | Auto Body Repair & Painting Shops | facebook.com |
| Carrosserie Robert Dupuis | Car Repair | — |
| Carrosseries Technipro 2014 | Auto Body Shop | facebook.com |
| CARSTAR Longueuil Ouest | Auto Body Shop Equipment & Supplies | carstar.ca |
| CARSTAR Longueuil Taschereau | Auto Body Shop Equipment & Supplies | carstar.ca |
| Cartes Sportives Jumbobear | Collectibles | facebook.com |
| Casa Western | Boots | facebook.com |
| Castonguay Électronique | Tout Entreprises et services | castonguay-electronique.com |
| Cazza Petite | Clothing Stores | facebook.com |
| Cecile Loiselle Coiffure | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Cedan Inc. | Tout Entreprises et services | cedan.com |
| CEGEP Montpetit | Tout Enseignement et savoir | cegepmontpetit.ca |
| CEL AEROSPACE LTÉE (ÉQUIPEMENT D'ESSAI AÉROSPATIAL) | Aerospace | cel-aerospace.ca |
| Cellphonesunlock Ca | Business Centres | facebook.com |
| Centre Amma Inc | Beauty & Health Spas | facebook.com |
| Centre Chiro-Express Du Vieux Longueuil | Chiropractors | facebook.com |
| Centre Chiropratique Chemin De Chambly | Chiropractors | chirocliniquesverdlove.com |
| Centre Chiropratique Concept Chiro-Santé | Chiropractors | santechiropratique.com |
| Centre Chiropratique de Longueuil | Alternative Health | chiropraticienlongueuil.com |
| Centre Chiropratique Dussault | Chiropractors | centrechiropratiquedussault.com |
| Centre Chiropratique Raymond | Tout Entreprises et services | chiropratiqueraymond.com |
