- Safety & Security Systems & Consultants, Thorold
- Sales & Marketing Consultant, Thorold
- Salvation Army, Thorold
- Sandwich Shop Restaurants, Thorold
- Scrap & Waste Machinery, Thorold
- Scrap & Waste Materials, Thorold
- Screen Printing, Thorold
- Secondary Schools, Thorold
- Senior Citizens Housing, Thorold
- Senior Citizens Information & Services, Thorold
- Senior Citizens Service & Health Organizations, Thorold
- Service Establishment Supplies & Equipment, Thorold
- Sewer Construction Contractors, Thorold - Sewer Line, Pipe Installation & Repair Services
- Sharpening Service, Thorold
- Sheet Metal Contractors, Thorold - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Thorold
- Shoe Store - More, Thorold
- Shopping & Shopping Services, Thorold
- Siding Contractors, Thorold - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sightseeing Tours, Thorold
- Signs, Thorold
- Skateboards & Equipment Shops, Thorold - Skateboarding Supplies
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- Snack Foods, Thorold
- Snow Removal Services, Thorold - Snow Plow Service
- Social Services & Welfare, Thorold
- Societies & Foundation Associations, Thorold
- Solar Equipment, Thorold
- Special Events Photographers, Thorold
- Special Interest Schools Or Instruction, Thorold
- Speciality Food Stores, Thorold
- Specialty Goods Storage, Thorold
- Specialty Stores, Thorold
- Sporting Goods Stores, Thorold
- Sports & Recreational Services, Thorold
- Stadiums, Arenas, Coliseums & Athletic Fields, Thorold
- Staffing & Support Services, Thorold
- Steel Detailers, Thorold
- Steel Erection Contractors, Thorold - Steel Erectors
- Steel Manufacturers, Thorold
- Steel Used, Thorold
- Steel Work Contractors, Thorold
- Stone Setting Contractors, Thorold
- Submarine Sandwich Restaurants, Thorold
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