| Plancher 2000 | Ceramic Tile Dealers | plancher2000.ca |
| Plancher bois franc 2000 | Tout Entreprises et services | plancher2000.ca |
| Planchers Champagne Inc | Flooring | facebook.com |
| Planchers Pmr Inc | Flooring | — |
| Planchers Quebecois Ltee | Flooring | facebook.com |
| Planimage | Tout Entreprises et services | planimage.com |
| Plans design | Tout Entreprises et services | plans-design.ca |
| Plein Sud Centre d'Exposition en Art Actuel à Longueuil | Art Galleries, Dealers & Consultants | facebook.com |
| Plomberie de la Rivière | Plumbing | plomberiedelariviere.com |
| Plomberie Foster | Plumbing | plomberiefoster.com |
| Pneus Alain Trudel Inc. | Balancing Service | — |
| Pneus Chartand | Tout Commerces au détail | pneuschartrand.ca |
| Pneus Chartrand Mecanique | Balancing Service | — |
| Pneus Ouellette | Balancing Service | facebook.com |
| Pneuxpert Longueuil Inc | Balancing Service | pneuxpert.com |
| Point Virgule Communication | Communications & Public Relations Consultants | facebook.com |
| Polissage & Placage G.G. inc. | Tout Entreprises et services | placagegg.com |
| Polyclinique Longueuil | Medical Clinics | — |
| Polyclinique Longueuil | Medical Clinics | — |
| Portes et Fenêtres Président | Tout Entreprises et services | portesetfenetrespresident.com |
| Portes et moulures dépôt | Tout Commerces au détail, Tout Entreprises et services | portesetmouluresdepot.com |
| Pratt & Whitney | Tout Entreprises et services | prattwhitney.com |
| PRATT & WHITNEY CANADA INC. | Aerospace | pwc.ca |
| Prestal Construction Inc. - Rénovation Longueuil | Bathroom Renovations | 411habitation.com |
| Prime Wireless | Answering Machines & Equipment | — |
| Primus Management Ulc | Animal Medications | — |
| Prisma Coiffure | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Pro Desk at RONA | Building Material Manufacturers & Wholesalers | vip-pro.ca |
| Pro NanoTech Esthéthique | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Pro-Tek | Tout Entreprises et services | pro-tek.ca |
| Producteurs de grains du Québec | Tout Entreprises et services | pgq.ca |
| Productions Boomers | Alternative Health | facebook.com |
| Produits Forestiers CJP Inc | Building Material Manufacturers & Wholesalers | — |
| Produits Forestiers Direct Inc | Building Material Manufacturers & Wholesalers | — |
| Produits Grisspasta Ltée | Agri-food | grisspasta.com |
| Prof Paradis | Astrologers & Psychics | — |
| Professional Massage Therapy Center | Massage Therapy | — |
| Projet I S E H M S | Community Service & Charitable Organizations | isehms.qc.ca |
| ProKicker | Tout Arts et divertissement, Tout Commerces au détail | prokicker.ca |
| Promotion Rd Meubles | Furniture Stores | — |
| Protech-Shine Esthétique Automobile | Car Washes | protech-shine.com |
| Protection Incendie Aquateck | Automatic Fire Sprinkler Systems | incendieaquateck.com |
| Protection Pash | Auto Body Shop | protectionpash.com |
| Proxim Amir Helkany - pharmacie affiliée | Pharmacy | groupeproxim.ca |
| Proxim pharmacie affiliée - Judith Choquette | Pharmacy | groupeproxim.ca |
| Proxim pharmacie affiliée - Kinda et Roua Bouz | Pharmacy | groupeproxim.ca |
| Publicite Hpublicite | Advertising Agencies | — |
| Pyradia | Tout Entreprises et services | pyradia.com |
| Pâtisserie Rolland Inc. | Tout Commerces au détail | patisserierolland.ca |
| Pâtisseries Jessica Inc. | Agri-food | jessicapastries.com |
