- Package Design Services, Welland - Package Designing & Development Service
- Package Preparation, Shipment & Mail Services, Welland
- Packaging, Shipping & Labeling Services, Welland
- Paint & Painting Supplies, Welland
- Paint Stores, Welland
- Paint Supplies & Equipment, Welland
- Painters, Welland - Painting Contractors
- Painting Supplies & Equipment, Welland
- Paints, Varnishes & Surface Finishes - Manufacturers, Welland
- Pallets & Skids Companies, Welland - Wholesale - Suppliers
- Pants & Jeans, Welland
- Paper & Cardboard Manufacturers, Welland
- Paper Boxes, Welland
- Paper Finishers Manufacturers, Welland
- Paper Products - Wholesale & Manufacturers, Welland
- Paper Shredding Machines , Welland - Shredding, Perforators & Bursting Machines
- Paper Shredding Service, Welland
- Paralegals, Welland
- Parking Lot Road & Airport Services, Welland
- Party & Event Planning, Welland
- Party & Event Planning, Decorations, Equipment & Supplies, Welland - Party Supply Stores
- Party Supplies Rentals, Welland
- Passenger Air Transportation, Welland
- Passenger Ground Transportation, Welland
- Passenger Vehicle Dealers, Welland
- Patio, Porch & Deck Builders, Welland - Installation, Repair & Maintenance Services
- Paving Contractors - Driveway, Road, Walkway, Welland - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pawn Shops, Welland
- Pension Health & Welfare Funds, Welland
- Pentecostal Churches, Welland
- Personal Care, Welland
- Personal Credit Institutions & Services, Welland
- Personal Financial Services, Welland
- Personal Legal Services, Welland
- Personal Service Agents, Welland
- Personal Service Consultants, Welland
- Personal Services, Welland
- Personal Watercraft Dealers, Welland
- Pet Care Services, Welland
- Pet Cemetery Supplies & Equipment, Welland - Pet Cremation
- Pet Food & Supplies, Welland
- Pet Grooming & Boarding Services, Welland
- Pet Shops & Supplies, Welland
- Petroleum Refining, Welland
- Petroleum Services, Welland
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- Pets Stores & Pet Supplies , Welland
- Pharmacy & Drug Stores, Welland - Drugstore - Chemists
- Photo & Picture Frames, Welland - Picture Framing
- Photofinishing Laboratories, Welland
- Photographers, Welland
- Photography, Welland
- Physiotherapy, Welland
- Piano & Organ Stores & Dealers - Sales & Rental, Welland
- Pipes, Welland
- Pizza Restaurant 1 Of 2, Welland
- Plastic Molds & Plastic Processing, Welland
- Plastic Products Manufacturers, Welland
- Plastic Vacuum & Pressure Forming Manufacturers, Welland
- Playgrounds Parks & Trails, Welland
- Plumbers & Plumbing Contractors, Welland - Installation, Repair & Replace Services
- Plumbing Equipment & Portable Toilet Rental & Leasing, Welland
- Plumbing Supply Manufacturers, Welland
- Podiatrists, Welland - Foot Doctors, Physicians & Surgeons (Podiatric Medicine)
- Political Organizations, Welland
- Political Organizations, Welland
- Post Offices, Welland
- Poultry Wholesale, Welland
- Power Tools Companies, Welland - Wholesale, Manufacturers & Suppliers
- Prefabricated Homes & Buildings, Welland - Prefab Homes - Structures
- Pregnancy Counseling & Information Services, Welland
- Presbyterian Churches, Welland
- Print Ads - Newspaper Advertising, Welland
- Printers Services, Welland
- Printing Services & Publishing Services, Welland
- Product Rental & Leasing, Welland
- Product Repair Services, Welland
- Professional, Welland
- Professional Credential, Association, And - Or Degree, Welland
- Professional Equipment & Supplies, Welland
- Professional Services, Welland
- Professionals Equipment & Supplies, Welland
- Promotional Products, Welland - Promotional Items, Corporate Gifts, Personalized Gifts, etc
- Promotional Services, Welland
- Propane & Natural Gas, Welland
- Property Operation - Retail Outlet Mall & Establishments, Welland
- Public Accountants, Welland
- Public Health Program Administration, Welland
- Public Libraries, Welland
- Publishing & Printing Manufacturers, Welland
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