- Salvation Army, Wallaceburg
- Sandwich Shop Restaurants, Wallaceburg
- Scrap & Waste Machinery, Wallaceburg
- Scrap & Waste Materials, Wallaceburg
- Secondary Schools, Wallaceburg
- Security Alarm Systems - Home & Business, Wallaceburg
- Security Brokers & Dealers, Wallaceburg
- Security Control Systems & Monitoring, Wallaceburg - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Wallaceburg
- Senior Citizens Service & Health Organizations, Wallaceburg
- Ship & Boat Building & Repairing, Wallaceburg
- Shopping & Shopping Services, Wallaceburg
- Siding Contractors, Wallaceburg - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Skin Care & Cosmetology Salons, Wallaceburg
- Small Appliances, Wallaceburg
- Small Business Services, Wallaceburg
- Snacks & Desserts, Wallaceburg
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- Social Clubs & Organizations, Wallaceburg
- Social Services & Welfare, Wallaceburg
- Societies & Foundation Associations, Wallaceburg
- Special Dies Tools Jigs & Fixtures Manufacturers, Wallaceburg
- Special Events Photographers, Wallaceburg
- Speciality Food Stores, Wallaceburg
- Specialty Goods Storage, Wallaceburg
- Specialty Stores, Wallaceburg
- Sporting Goods Stores, Wallaceburg
- Sports & Recreational Services, Wallaceburg
- Staffing & Support Services, Wallaceburg
- Steel Manufacturers, Wallaceburg
- Stoves & Furnace Equipment, Wallaceburg - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Wallaceburg
- Substance Abuse Outpatient Clinics, Wallaceburg
- Swimming Pools, Wallaceburg
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