- Safety & Security Systems & Consultants, South Windsor
- Sand Gravel & Aggregate, South Windsor
- Sandblasting, South Windsor - General Contractors
- Sandwich Shop Restaurants, South Windsor
- Satellite & Cable TV Equipment & Systems Repair & Service, South Windsor
- Satellite TV Service, South Windsor
- Scaffolding & Aerial Lifts, South Windsor
- Scientific & Laboratory Equipment & Instruments, South Windsor
- Scrap & Waste Materials, South Windsor
- Screen Printing, South Windsor
- Seafood Restaurants, South Windsor
- Security Brokers & Dealers, South Windsor
- Senior Citizens Housing, South Windsor
- Service Establishment Supplies & Equipment, South Windsor
- Sewer & Drain Cleaning & Repair, South Windsor - Drain Cleaner & Installation Services
- Sewer Construction Contractors, South Windsor - Sewer Line, Pipe Installation & Repair Services
- Sheet Metal Contractors, South Windsor - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, South Windsor
- Shoe Store - More, South Windsor
- Shoe Stores, South Windsor - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, South Windsor
- Shot Blasting, South Windsor
- Siding Contractors, South Windsor - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, South Windsor
- Silica Minerals & Ores, South Windsor
- Skating Rink & Hockey Operation Services, South Windsor
- Skin Care & Cosmetology Salons, South Windsor
- Skin Care Products & Treatments, South Windsor
- Small Appliances, South Windsor
- Smoothie Restaurants, South Windsor
- Snack Foods, South Windsor
- Snacks & Desserts, South Windsor
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- Snow Removal Services, South Windsor - Snow Plow Service
- Social Services & Welfare, South Windsor
- Social Workers & Services, South Windsor
- Societies & Foundation Associations, South Windsor
- Special Coatings, South Windsor - Protective Coatings
- Special Events & Party Supply Rental, South Windsor
- Special Interest Schools Or Instruction, South Windsor
- Specialty Animal Services, South Windsor
- Specialty Communication Companies & Services, South Windsor
- Specialty Stores, South Windsor
- Speech & Hearing Specialists, South Windsor
- Sporting Goods Stores, South Windsor
- Sports & Recreational Services, South Windsor
- Sports Medicine, South Windsor - Doctors, Physicians & Surgeons
- Sprinkler Alarm Systems, South Windsor - Fire Sprinkler Systems
- Stadiums, Arenas, Coliseums & Athletic Fields, South Windsor
- Staffing & Support Services, South Windsor
- Staircases Stairs & Railings, South Windsor
- Stationery & Office Supplies, South Windsor
- Steel & Metal Goods, South Windsor - Steel Distributors
- Steel Manufacturers, South Windsor
- Steel Tool & Alloy, South Windsor
- Stock & Bond Brokers & Dealers, South Windsor
- Stocks & Bond Brokers, South Windsor
- Stoves & Furnace Equipment, South Windsor - Fittings & Repair Parts
- Surveyor Services, South Windsor - Surveying Service
- Sweepers & Scrubbers Industrial, South Windsor - Sweeping Service
- Swimming Pool Covers & Enclosures, South Windsor
- Swimming Pool, Sauna & Spa Contractors, South Windsor
- Swimming Pools Contractors, South Windsor - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, South Windsor
- Swimming Pools Supplies, Equipment & Accessories, South Windsor
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