| Halte I Café - Apéro | Longueuil | Coffee Shops |
| Hanacom | Longueuil | Computer Networking |
| Hansak | Longueuil | Architects |
| Hardbacon | Longueuil | Tout Entreprises et services, Tout Informatique et internet |
| Harshi'S Beauty Salon | Longueuil | Beauty & Fitness, Hairdressers & Beauty Salons |
| Hebergement La Casa | Longueuil | Emergency Shelters |
| Hemmings Avocat Inc | Longueuil | Business Lawyers |
| Henri Désormeaux Inc | Longueuil | Bookkeeping Software & Accounting Systems |
| Hermione Coiffure Et Soins De Beauté Elle Et Lui | Longueuil | Beauty & Fitness, Hairdressers & Beauty Salons |
| Heroux Devtek | Longueuil | Aircraft Parts, Engines & Avionics |
Publicité (Desktop) Publicité (Mobile) |
| Heure De Pointe | Longueuil | Pizza & Pizzerias |
| Hidrone Imagerie Numérique | Longueuil | Aerial Photographers |
| Hipporay | Longueuil | Child Care Equipment & Supplies |
| Houde Magalie Dr | Longueuil | Dentists |
| Huynh Phuc Dr | Longueuil | Dentists |
| HÉROUX-DEVTEK INC. (Division Trains d'atterrissage) | Longueuil | Aerospace |
| Hélène de Léséleuc conseillère d´orientation psychothérapeute | Longueuil | Career Counselling |
| Héroux-Devtek Inc | Longueuil | Aircraft Parts, Engines & Avionics, Tout Entreprises et services |
| Hôpital Pierre-Boucher | Longueuil | Tout Communautés et société |
| ICi Centre de Multi-Services | Longueuil | Beauty Salon Equipment & Supplies |
Publicité (Desktop) Publicité (Mobile) |
| Icils | Longueuil | Beauty & Fitness, Hairdressers & Beauty Salons |
| Idea Communication | Longueuil | Advertising Agencies |
| IGA Extra | Longueuil | Not Profit, Grocery Stores |
| Ilead Technologies Inc | Longueuil | Shopping Mall |
| Import Export Probec Intl | Longueuil | Balancing Service |
| Impression Logobec International Lt... | Longueuil | Tout Commerces au détail, Tout Entreprises et services |
| Impression Multi-Services Inc | Longueuil | Shopping Mall |
| Imprimerie Tr Enr | Longueuil | Arts & Crafts Supplies, Arts & Crafts Materials & Supplies |
| IMS Designs | Longueuil | Advertising Agencies |
| Industrie - L Inc | Longueuil | Aluminum |
Publicité (Desktop) Publicité (Mobile) |
| Infox Design | Longueuil | Business Centres |
| Innova Medic | Longueuil | Beauty & Health Spas |
| Innovant | Longueuil | Architects |
| Institut Aroma Beauté | Longueuil | Beauty Institutes |
| Institut Bella Vida | Longueuil | Beauty & Fitness, Hairdressers & Beauty Salons |
| Institut biblique du Québec | Longueuil | Tout Communautés et société |
| Institut Bl | Longueuil | Beauty & Fitness, Hairdressers & Beauty Salons |
| Institut De Recherche | Longueuil | Alternative Health |
| Institut Généalogique Drouin | Longueuil | Tout Entreprises et services |
| Institut Nazareth et Louis-Braille | Longueuil | Tout Communautés et société |
Publicité (Desktop) Publicité (Mobile) |
| Institute De Physiatrie Du | Longueuil | Not Profit, Medical Clinics |
| Intuitic Inc | Longueuil | Shopping Mall |
| INVESTISSEMENTS BSA INC. | Longueuil | Agri-food |
| Investissements Crystal Water | Longueuil | Life Sciences and Health Technologies (LSHT) |
| Isabelle Choquette Podologie | Longueuil | Chiropodists |
| Iseco Safety Shoes LTD | Longueuil | Boots |
| Ivoire Santé Dentaire Longueuil | Longueuil | Artists |
| Jardin Select | Longueuil | Landscaping |
| Jay-A-Shoes | Longueuil | Boots |
| Jc Promo + | Longueuil | Business Centres |
