- Safety Equipment & Supplies, Slave Lake
- Safety Training Schools, Slave Lake
- Sand Gravel & Aggregate, Slave Lake
- Sandblasting, Slave Lake - General Contractors
- Sandblasting Equipment & Supplies, Slave Lake
- Sandwich Shop Restaurants, Slave Lake
- Secondary Schools, Slave Lake
- Security Alarm Systems - Home & Business, Slave Lake
- Security Brokers & Dealers, Slave Lake
- Security Control Systems & Monitoring, Slave Lake - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Slave Lake
- Sewing & Yarn Stores & Supplies, Slave Lake
- Sheet Metal Contractors, Slave Lake - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Slave Lake
- Shoe Stores, Slave Lake - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Slave Lake
- Sightseeing Tours, Slave Lake
- Signs, Slave Lake
- Skateboards & Equipment Shops, Slave Lake - Skateboarding Supplies
- Social Clubs & Organizations, Slave Lake
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- Social Services & Welfare, Slave Lake
- Societies & Foundation Associations, Slave Lake
- Soup & Salad Restaurants, Slave Lake
- Special Coatings, Slave Lake - Protective Coatings
- Special Interest Schools Or Instruction, Slave Lake
- Specialty Stores, Slave Lake
- Speech & Hearing Specialists, Slave Lake
- Sporting Goods Stores, Slave Lake
- Sports & Recreational Services, Slave Lake
- Staffing & Support Services, Slave Lake
- State Government, Slave Lake
- Steak House Restaurants, Slave Lake
- Steam Cleaning Residential, Slave Lake
- Steel Manufacturers, Slave Lake
- Steel Pipes & Tubes Manufacturers, Slave Lake
- Stereo, Audio & Video Equipment Dealers & Stores, Slave Lake
- Stitching Services, Slave Lake
- Storage Equipment Rental & Leasing, Slave Lake
- Stoves & Furnace Equipment, Slave Lake - Fittings & Repair Parts
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