- Safety & Security Systems & Consultants, East Hampton
- Sales & Marketing Consultant, East Hampton
- Sand Gravel & Aggregate, East Hampton
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, East Hampton
- Scientific Equipment & Services, East Hampton
- Scientific Services, East Hampton
- Screen Printing, East Hampton
- Screens Doors & Windows, East Hampton
- Seafood Restaurants, East Hampton
- Secondary Schools, East Hampton
- Security & Surveillance System & Equipment, East Hampton
- Security Alarm Systems - Home & Business, East Hampton
- Security Brokers & Dealers, East Hampton
- Security Control Systems & Monitoring, East Hampton - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, East Hampton - Bodyguard, Guard Dogs, Etc
- Security Services, East Hampton
- Semi Precious Metals, East Hampton
- Senior Citizens Service & Health Organizations, East Hampton
- Septic & Cesspool Building & Service, East Hampton
- Septic Tanks & Systems, East Hampton - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, East Hampton - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, East Hampton
- Shoe Stores, East Hampton - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, East Hampton
- Shopping & Shopping Services, East Hampton
- Siding Contractors, East Hampton - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Language - Interpreters, East Hampton
- Sign Lettering & Painting Services, East Hampton
- Signs, East Hampton
- Skin Care & Cosmetology Salons, East Hampton
- Skin Care Products & Treatments, East Hampton
- Skylights, East Hampton - Skylight Shades, Blinds, Covers & More
- Small Appliances, East Hampton
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- Snacks & Desserts, East Hampton
- Social Service Organizations Mental Health Services, East Hampton
- Social Services & Welfare, East Hampton
- Social Workers & Services, East Hampton
- Societies & Foundation Associations, East Hampton
- Solariums & Garden Rooms, East Hampton
- Special Events & Party Supply Rental, East Hampton
- Special Interest Schools Or Instruction, East Hampton
- Specialty Animal Services, East Hampton
- Specialty Stores, East Hampton
- Sporting & Recreational Camps, East Hampton
- Sporting Goods Equipment Rental, East Hampton
- Sporting Goods Manufacturers, East Hampton
- Sporting Goods Stores, East Hampton
- Sports & Recreational Services, East Hampton
- Sportswear Clothing Stores, East Hampton - Sports Clothes
- Sprinkler System Contractors, East Hampton - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, East Hampton
- State Government, East Hampton
- Stereo, Audio & Video Equipment Dealers & Stores, East Hampton
- Stock & Bond Brokers & Dealers, East Hampton
- Stocks & Bond Brokers, East Hampton
- Storm & Hurricane Protection, East Hampton - Shutters, Doors, Windows, Shelters, etc
- Surveyor Services, East Hampton - Surveying Service
- Swimming Pool Covers & Enclosures, East Hampton
- Swimming Pool Covers Manufacturers, East Hampton
- Swimming Pool, Sauna & Spa Contractors, East Hampton
- Swimming Pools Contractors, East Hampton - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, East Hampton
- Swimming Pools Supplies, Equipment & Accessories, East Hampton
- Swimwear & Accessories Shops, East Hampton - Water Sports Equipment
- Synagogues & Temples, East Hampton
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