| Panache Markcomm | Lachine | Communications & Public Relations Consultants |
| Panasonic Canada Inc. | Lachine | Tout Entreprises et services |
| Papier Durabox Inc | Lachine | Cardboard |
| Paradoxe Déconstruction | Lachine | Tout Entreprises et services |
| Pareco Plus Inc | Lachine | Roofing |
| PASTA ANDREA | Lachine | Pizza & Pizzerias |
| PATTONAIR | Lachine | Aerospace |
| Paysagiste Bjr Landscaping | Lachine | Landscaping |
| Paysagiste Duwood Landscaping | Lachine | Landscaping |
| Paysagiste Lewis Landscaping Inc. | Lachine | Landscaping |
Publicité (Desktop) Publicité (Mobile) |
| PDQ 8 - SPVM (Lachine, Saint-Pierre - Poste de quartier 8 - Service de Police de la Ville de Montréal - SPVM) | Lachine | Emergency |
| Peintures Et Services PCT Inc | Lachine | Painters |
| Pelco | Lachine | Tout Entreprises et services |
| Perron D | Lachine | Balconies |
| Pharmacie Kira Azar inc. | Lachine | Pharmacy |
| Pierre Training | Lachine | Fitness Gyms |
| Pierre-Raymond Goyer | Lachine | Chartered Administrators |
| Pizza Hut | Lachine | Pizza & Pizzerias |
| Pizza Provost | Lachine | Pizza & Pizzerias |
| Pj Delli Colli | Lachine | pj |
Publicité (Desktop) Publicité (Mobile) |
| Plan B Montréal | Lachine | Cleaning Services, Cleaning Service |
| Planète Courrier Inc | Lachine | Tout Entreprises et services |
| Plastiques Dura | Lachine | Chemicals |
| Plomberie Costel 24H Inc | Lachine | Plumbing |
| Plomberie Dominion Inc. | Lachine | Plumbing |
| Plomberie et Chauffage Lachine Inc | Lachine | Plumbing |
| Plomberie Pro Solution Inc | Lachine | Plumbing |
| Plomberie Pro Solution Inc | Lachine | Plumbing |
| Pneus Lachine Inc | Lachine | Balancing Service |
| Pneus Lachine IncEntrepôt | Montréal | Tire Shop |
Publicité (Desktop) Publicité (Mobile) |
| PNEUTECH-ROUSSEAU | Lachine | Aerospace |
| Pole Air Aviation Inc | Lachine | Aerospace, Aircraft Parts, Engines & Avionics, Tout Entreprises et services |
| Power Electronics and Energy Research Group (PEER) | Montréal | Clean Technologies |
| Precision Time | Lachine | Clock Repair |
| Prince Logistic Services | Lachine | Tout Entreprises et services |
| Prolex Electronics Inc. | Montréal | Tout Entreprises et services |
| Promark Electronics | Montréal | Tout Entreprises et services |
| Protech Suspension | Lachine | Business & Trade Organizations |
| Pylon Electronics Inc. | Vaudreuil-Dorion | Tout Entreprises et services |
| Pâtisserie Carvin Déli Inc. | Lachine | Agri-food |
Publicité (Desktop) Publicité (Mobile) |
| Quantum Lifecycle | Lachine | Tout Entreprises et services |
| Raymond Enone Babies & Kids RayEnone.ca Montreal - Lachine | Lachine | Baby Products & Accessories |
| Rees Colors | Lachine | Aquariums & Supplies |
| Reparations Fit-Fix inc. | Lachine | Tout Commerces au détail |
| Restaurant Il Fornetto | Lachine | Breakfast Restaurants |
| Riverain Services d'Appareils Ménagers Inc | Lachine | Appliance Repair & Service |
| Robert Burch Communications | Lachine | Tout Entreprises et services |
| Rockfield Church | Lachine | Churches & Other Places of Worship |
| Rolls-Royce Canada Ltée | Lachine | Aerospace, Tout Entreprises et services |
| RONA Lachine Famille Chartier Inc. | Lachine | Clothes Lines |
