- Scrap & Waste Materials, Windsor
- Seafood Restaurants, Windsor
- Security Alarm Systems - Home & Business, Windsor
- Security Control Systems & Monitoring, Windsor - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Windsor
- Security Services, Windsor
- Senior Citizens Service & Health Organizations, Windsor
- Shooting & Target Ranges, Windsor
- Shopping & Shopping Services, Windsor
- Ski Shops - Equipment & Supplies Sales & Rental, Windsor
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Windsor
- Skin Care & Cosmetology Salons, Windsor
- Skin Care Products & Treatments, Windsor
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- Snowmobile Dealers, Windsor - Parts, Gear, Clothing & Accessories
- Snowmobile Trailers, Windsor
- Social Services & Welfare, Windsor
- Societies & Foundation Associations, Windsor
- Solar Energy Companies - Contractors, Windsor - Solar Panel Installation - Solar Power Systems
- Special Education & Care, Windsor
- Specialty Animal Services, Windsor
- Specialty Stores, Windsor
- Sporting Goods Stores, Windsor
- Staffing & Support Services, Windsor
- State Government, Windsor
- Stitching Services, Windsor
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