- Sales & Marketing Consultant, Wading River
- Sandwich Shop Restaurants, Wading River
- Savings Banks, Wading River
- Scientific Equipment & Services, Wading River
- Scientific Services, Wading River
- Seafood Restaurants, Wading River
- Secondary Schools, Wading River
- Security & Surveillance System & Equipment, Wading River
- Security Services, Wading River
- Shopping & Shopping Services, Wading River
- Snacks & Desserts, Wading River
- Snow Removal Services, Wading River - Snow Plow Service
- Social Services & Welfare, Wading River
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- Social Workers & Services, Wading River
- Societies & Foundation Associations, Wading River
- Sod & Sodding Service, Wading River
- Specialty Stores, Wading River
- Speech & Hearing Specialists, Wading River
- Sporting & Recreational Camps, Wading River
- Sports Bars & Lounges, Wading River
- Sportswear Manufacturers, Wading River
- Surveyor Services, Wading River - Surveying Service
- Surveyors, Wading River
- Swimming Pool, Sauna & Spa Contractors, Wading River
- Swimming Pools Contractors, Wading River - Install Inground - Above Ground Pools
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