- Sand Gravel & Aggregate, Markdale
- Scrap & Waste Materials, Markdale
- Secondary Schools, Markdale
- Security Alarm Systems - Home & Business, Markdale
- Security Control Systems & Monitoring, Markdale - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Markdale
- Septic Systems Installation & Repair, Markdale
- Septic Tanks & Septic Systems Contractors, Markdale - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing Machine Repair & Service, Markdale
- Sewing Machines, Equipment & Supplies, Markdale
- Sheet Metal Contractors, Markdale - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Markdale
- Shopping & Shopping Services, Markdale
- Signs, Markdale
- Ski & Snowmobile Clubs, Markdale
- Ski Centers, Markdale
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- Ski Equipment & Supplies Shops, Markdale - Skiing Helmets, Goggles, Clothes, Boots, Gear & Accessories
- Ski Resorts, Markdale
- Small Appliances, Markdale
- Snacks & Desserts, Markdale
- Social Services & Welfare, Markdale
- Special Events & Party Supply Rental, Markdale
- Special Interest Schools Or Instruction, Markdale
- Specialty Animal Services, Markdale
- Specialty Stores, Markdale
- Sporting Goods Equipment Rental, Markdale
- Sporting Goods Stores, Markdale
- Sportswear Clothing Stores, Markdale - Sports Clothes
- Stadiums, Arenas, Coliseums & Athletic Fields, Markdale
- Stitching Services, Markdale
- Swimwear & Accessories Shops, Markdale - Water Sports Equipment
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