- Eastern Orthodox Church, East Setauket
- Education, East Setauket
- Educators, East Setauket
- Electrical Supplies, Parts & Equipment, East Setauket - Wholesale & Manufacturers
- Electricians, East Setauket - Electrical Contractors
- Electronic Repair Shops , East Setauket
- Electronic Research, Design & Development, East Setauket
- Electronics Manufacturers, East Setauket
- Electronics Repair & Maintenance , East Setauket
- Electronics Stores, East Setauket
- Elementary Schools, East Setauket
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- Emergency Services, East Setauket
- Emergency Victim Services, East Setauket
- Employment Agencies, East Setauket - Staffing Agencies
- Employment Agencies Teachers, East Setauket
- Energy & Conservation Agencies, East Setauket
- Engineer & Architect Services, East Setauket - Engineering & Architecture Service
- Entertainment & Recreation, East Setauket
- Environmental Products, East Setauket
- Environmental Products & Services, East Setauket
- Ethan Allen Furniture Stores, East Setauket
- European Cuisine, East Setauket
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