- Sailing Instructions, Magog
- Sand Gravel & Aggregate, Magog
- Sandblasting, Magog - General Contractors
- Scrap & Waste Materials, Magog
- Secondary Schools, Magog
- Senior Citizens Housing, Magog
- Septic Tanks & Systems, Magog - Wholesale, Dealers & Suppliers
- Service Establishment Supplies & Equipment, Magog
- Sewer Flooding Control Systems, Magog
- Sewing & Yarn Stores & Supplies, Magog
- Ship & Boat Building & Repairing, Magog
- Shoe Repair Shops, Magog
- Shoe Store - More, Magog
- Shoe Stores, Magog - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Magog
- Sign Equipment & Supplies, Magog
- Signs, Magog
- Silk Screen Printing, Magog
- Silkscreen Printing, Magog
- Skateboards & Equipment Shops, Magog - Skateboarding Supplies
- Skating Supplies, Magog - Ice, Inline, Speed, Figure & Roller Skates
- Ski Equipment & Supplies Shops, Magog - Skiing Helmets, Goggles, Clothes, Boots, Gear & Accessories
- Ski Shops - Equipment & Supplies Sales & Rental, Magog
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Magog
- Sleds, Snowboards & Snowshoes Shops, Magog - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Small Appliances, Magog
- Snacks & Desserts, Magog
- Snow Removal Services, Magog - Snow Plow Service
- Social Services & Welfare, Magog
- Societies & Foundation Associations, Magog
- Solar Equipment, Magog
- Special Education & Care, Magog
- Special Events & Party Supply Rental, Magog
- Special Events Photographers, Magog
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- Special Interest Schools Or Instruction, Magog
- Speciality Food Stores, Magog
- Specialty Animal Services, Magog
- Specialty Stores, Magog
- Speech & Hearing Specialists, Magog
- Speech & Language Therapy, Magog
- Sporting Goods Stores, Magog
- Sports & Recreational Services, Magog
- Sports Clubs, Magog
- Sports Promoters & Managers, Magog
- Sports Promotions & Special Events, Magog
- Stadiums, Arenas, Coliseums & Athletic Fields, Magog
- Staffing & Support Services, Magog
- Stationery & Office Supplies, Magog
- Stationery Manufacturers, Magog
- Steak House Restaurants, Magog
- Steam Cleaner - Commercial & Industrial, Magog - Steam Cleaning - Upholstery, Floor, Carpet, etc
- Steel Frame Supplies, Magog
- Steel Manufacturers, Magog
- Steel Mills & Blast Furnaces, Magog
- Steel Reinforcing Fabricators, Magog
- Steel Used, Magog
- Stereo, Audio & Video Equipment Dealers & Stores, Magog
- Stoves, Ovens, Ranges & Cooktops, Magog
- Substance Abuse Clinics, Magog - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Outpatient Clinics, Magog
- Sunroom & Solarium Construction Contractors, Magog
- Surveyor Services, Magog - Surveying Service
- Surveyors, Magog
- Sushi Restaurants, Magog
- Swimming Pool, Sauna & Spa Contractors, Magog
- Swimming Pools Contractors, Magog - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Magog
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