- Scrap & Waste Materials, McDougall
- Secondary Schools, McDougall
- Septic Systems Installation & Repair, McDougall
- Septic Tanks & Septic Systems Contractors, McDougall - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sharpening Service, McDougall
- Ship & Boat Building & Repairing, McDougall
- Shopping & Shopping Services, McDougall
- Siding Contractors, McDougall - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Siding Materials, McDougall
- Snow Removal Services, McDougall - Snow Plow Service
- Snowmobile Dealers, McDougall - Parts, Gear, Clothing & Accessories
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- Social Services & Welfare, McDougall
- Special Events & Party Supply Rental, McDougall
- Specialty Stores, McDougall
- Specialty Vehicle Rental & Leasing, McDougall
- Sporting Goods Equipment Rental, McDougall
- Storm Doors & Windows, McDougall
- Stoves & Furnace Equipment, McDougall - Fittings & Repair Parts
- Sunroom & Solarium Construction Contractors, McDougall
- Sunrooms & Solarium Construction Contractors, McDougall - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, McDougall - Build & Repair
- Sweepers & Scrubbers Industrial, McDougall - Sweeping Service
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