- Sand Gravel & Aggregate, Welland
- Sandwich Shop Restaurants, Welland
- Satellite & Cable TV Equipment & Systems Repair & Service, Welland
- Satellite Dish Antennas & Equipment Dealers, Welland
- Scientific & Laboratory Equipment & Instruments, Welland
- Scrap & Waste Machinery, Welland
- Scrap & Waste Materials, Welland
- Screen Printing, Welland
- Screening & Preventative Health Services, Welland
- Screens Doors & Windows, Welland
- Seafood Restaurants, Welland
- Secondary Schools, Welland
- Security Alarm Systems - Home & Business, Welland
- Security Brokers & Dealers, Welland
- Security Control Systems & Monitoring, Welland - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Welland - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Welland
- Security Services, Welland
- Seed & Grain Cleaning, Welland
- Senior Citizens Centers & Meals, Welland
- Senior Citizens Housing, Welland
- Senior Citizens Information & Services, Welland
- Senior Citizens Service & Health Organizations, Welland
- Septic Tank Pumping & Cleaning, Welland - Septic Systems
- Sewer & Drain Cleaning & Repair, Welland - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Welland - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Welland
- Sharpening Service, Welland
- Sheet Metal Contractors, Welland - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Welland
- Shipping Companies, Welland
- Shoe Stores, Welland - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Welland
- Shutters - Interior & Exterior, Welland - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Welland - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Welland
- Skating Supplies, Welland - Ice, Inline, Speed, Figure & Roller Skates
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Welland
- Skylights, Welland - Skylight Shades, Blinds, Covers & More
- Small Appliances, Welland
- Smoking Cessation Treatment Centers & Information Services, Welland
- Snack Foods, Welland
- Snacks & Desserts, Welland
- Snow Removal Services, Welland - Snow Plow Service
- Snowmobile Centers & Resorts, Welland
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- Social Clubs & Organizations, Welland
- Social Services & Welfare, Welland
- Societies & Foundation Associations, Welland
- Solariums & Garden Rooms, Welland
- Sound Systems, Microphones & Equipment, Welland
- Space Planning, Welland
- Special Coatings, Welland - Protective Coatings
- Special Education & Care, Welland
- Special Events & Party Supply Rental, Welland
- Special Events Photographers, Welland
- Special Interest Schools Or Instruction, Welland
- Speciality Food Stores, Welland
- Specialty Animal Services, Welland
- Specialty Stores, Welland
- Speech & Hearing Specialists, Welland
- Sporting Goods Stores, Welland
- Sports & Recreational Services, Welland
- Sports Clubs, Welland
- Sportswear Clothing Stores, Welland - Sports Clothes
- Spraying Booths & Equipment, Welland
- Staffing & Support Services, Welland
- Stamp Collecting & Coin Dealers , Welland
- State Government, Welland
- Steel & Metal Goods, Welland - Steel Distributors
- Steel Manufacturers, Welland
- Steel Mills & Blast Furnaces, Welland
- Steel Reinforcing Supplies, Welland
- Steel Used, Welland
- Stocks & Bond Brokers, Welland
- Stone Setting Contractors, Welland
- Store Fronts, Welland - Storefront
- Stoves & Furnace Equipment, Welland - Fittings & Repair Parts
- Stucco Siding Contractors, Welland - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Welland
- Submarine Sandwich Restaurants, Welland
- Substance Abuse Outpatient Clinics, Welland
- Sunroom & Solarium Construction Contractors, Welland
- Surplus & Salvage Merchandise, Welland
- Surveyor Services, Welland - Surveying Service
- Sushi Restaurants, Welland
- Swimming Pool, Sauna & Spa Contractors, Welland
- Swimming Pools Contractors, Welland - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Welland
- Swimming Pools Supplies, Equipment & Accessories, Welland
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