- Savings & Loan Associations, Greenport
- Savings Banks, Greenport
- Seafood Restaurants, Greenport
- Security & Surveillance System & Equipment, Greenport
- Security Services, Greenport
- Ship & Boat Building & Repairing, Greenport
- Shirtings Service, Greenport
- Shirts & T-Shirts, Greenport
- Shoe Stores, Greenport - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Greenport
- Signs, Greenport
- Snacks & Desserts, Greenport
- Social Services & Welfare, Greenport
- Societies & Foundation Associations, Greenport
- Solar Products & Services, Greenport
- Special Events & Party Supply Rental, Greenport
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- Speciality Food Stores, Greenport
- Specialty Stores, Greenport
- Speech & Hearing Specialists, Greenport
- Sporting Goods Stores, Greenport
- Sports Medicine, Greenport - Doctors, Physicians & Surgeons
- Sportswear Clothing Stores, Greenport - Sports Clothes
- Sportswear Manufacturers, Greenport
- Sportswear Wholesale, Greenport
- Staffing & Support Services, Greenport
- Steel & Metal Goods, Greenport - Steel Distributors
- Steel Manufacturers, Greenport
- Surfboard & Windsurfing Equipment Shops, Greenport
- Sushi Restaurants, Greenport
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Greenport
- Swimwear & Accessories Shops, Greenport - Water Sports Equipment
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