- Sand Gravel & Aggregate, Thornbury
- Secondary Schools, Thornbury
- Septic Systems Installation & Repair, Thornbury
- Septic Tanks & Septic Systems Contractors, Thornbury - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewage Septic Service, Thornbury
- Shoe Stores, Thornbury - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Thornbury
- Shutters - Interior & Exterior, Thornbury - Wood, Vinyl, Window, Plantation Shutters, etc
- Signs, Thornbury
- Ski & Snowmobile Clubs, Thornbury
- Sleds, Snowboards & Snowshoes Shops, Thornbury - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Snacks & Desserts, Thornbury
- Social Clubs & Organizations, Thornbury
- Social Services & Welfare, Thornbury
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- Societies & Foundation Associations, Thornbury
- Sod & Sodding Service, Thornbury
- Special Events Photographers, Thornbury
- Speciality Food Stores, Thornbury
- Specialty Animal Services, Thornbury
- Specialty Stores, Thornbury
- Speech & Hearing Specialists, Thornbury
- Sporting Goods Stores, Thornbury
- Sports Bars & Lounges, Thornbury
- Stadiums, Arenas, Coliseums & Athletic Fields, Thornbury
- Steel & Metal Goods, Thornbury - Steel Distributors
- Steel Manufacturers, Thornbury
- Stoves & Furnace Equipment, Thornbury - Fittings & Repair Parts
- Swimming Pools, Thornbury
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