- Education, Sayville
- Education Services, Sayville
- Educational Consultants, Sayville
- Educational Testing Services, Sayville
- Electric Companies, Sayville
- Electric Power Systems Contractors, Sayville
- Electrical Control Systems & Materials, Sayville
- Electrical Power Systems Testing & Maintenance, Sayville
- Electrical Supplies, Parts & Equipment, Sayville - Wholesale & Manufacturers
- Electricians, Sayville - Electrical Contractors
- Electronics Manufacturers, Sayville
- Electronics Stores, Sayville
- Elementary Schools, Sayville
- Emergency Rooms, Sayville - Urgent Care Centers
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- Emergency Services, Sayville
- Energy Services, Sayville
- Engineer & Architect Services, Sayville - Engineering & Architecture Service
- Entertainers & Entertainment Groups, Sayville
- Entertainment & Recreation, Sayville
- Entertainment Agencies & Bureaus, Sayville
- Entertainment Services, Sayville
- Episcopal Churches, Sayville
- Estate And Property Attorneys & Lawyers, Sayville
- Estate And Property Attorneys & Lawyers, Sayville
- Estate And Property Lawyers & Attorneys, Sayville
- Ethnic Goods & Products Stores, Sayville
- Excavation Contractors, Sayville - Excavating - Excavator Companies
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