- Safety & Security Systems & Consultants, Plantsville
- Sales & Marketing Consultant, Plantsville
- Sandwich Shop Restaurants, Plantsville
- Savings Banks, Plantsville
- Seafood Restaurants, Plantsville
- Secretarial & Court Reporting Services, Plantsville
- Security Services, Plantsville
- Service & Gas Station Equipment & Services, Plantsville
- Sheet Metal Contractors, Plantsville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Plantsville
- Shirts & T-Shirts, Plantsville
- Shoe Stores, Plantsville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Plantsville
- Siding Contractors, Plantsville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Ski Centers, Plantsville
- Ski Resorts, Plantsville
- Social Services & Welfare, Plantsville
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- Special Interest Schools Or Instruction, Plantsville
- Specialty Animal Services, Plantsville
- Specialty Stores, Plantsville
- Speech & Hearing Specialists, Plantsville
- Sporting Goods Stores, Plantsville
- Sportswear Clothing Stores, Plantsville - Sports Clothes
- State Government, Plantsville
- Steel Detailers, Plantsville
- Steel Work Contractors, Plantsville
- Stoves & Furnace Equipment, Plantsville - Fittings & Repair Parts
- Surveyor Services, Plantsville - Surveying Service
- Sweepers & Scrubbers Industrial, Plantsville - Sweeping Service
- Swimming Pool, Sauna & Spa Contractors, Plantsville
- Swimming Pools Contractors, Plantsville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Plantsville
- Swimming Pools Supplies, Equipment & Accessories, Plantsville
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