- Eastern Orthodox Church, Riverhead
- Education, Riverhead
- Education & Information Services, Riverhead
- Education Services, Riverhead
- Educational Consultants, Riverhead
- Educational Testing Services, Riverhead
- Educational, Philanthropic & Research Foundations, Riverhead
- Educators, Riverhead
- Electric Generating Plants, Riverhead
- Electric Motor Repair & Service, Riverhead
- Electric Motors & Generators , Riverhead
- Electrical Control Systems & Materials, Riverhead
- Electrical Supplies, Parts & Equipment, Riverhead - Wholesale & Manufacturers
- Electricians, Riverhead - Electrical Contractors
- Electronic Equipment, Parts & Supplies, Riverhead
- Electronics Components, Riverhead
- Electronics Manufacturers, Riverhead
- Electronics Repair & Maintenance , Riverhead
- Electronics Stores, Riverhead
- Elementary Schools, Riverhead
- Embroidery, Riverhead
- Embroidery Manufacturers, Riverhead
- Emergency Services, Riverhead
- Employment Agencies, Riverhead - Staffing Agencies
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- Employment And Labor Relations Attorneys & Lawyers, Riverhead
- Endocrinologists, Riverhead - Endocrinology, Diabetes & Metabolism Doctors, Physicians & Surgeons
- Endodontists, Riverhead - Root Canal Specialist
- Energy Services, Riverhead
- Engineer & Architect Services, Riverhead - Engineering & Architecture Service
- Engineering Consultants, Riverhead - Consulting Engineers
- ENT, Riverhead - Ears Nose & Throat Doctors, Physicians & Surgeons
- Entertainers & Entertainment Groups, Riverhead
- Entertainers & Groups, Riverhead
- Entertainment & Recreation, Riverhead
- Entertainment Agencies & Bureaus, Riverhead
- Entertainment Services, Riverhead
- Environmental Conservation & Ecological Services, Riverhead - Ecosystem Services
- Environmental Groups, Riverhead
- Environmental Products, Riverhead
- Environmental Services, Riverhead
- Episcopal Churches, Riverhead
- Equipment Installation Contractors, Riverhead
- Estate And Property Attorneys & Lawyers, Riverhead
- Estate And Property Attorneys & Lawyers, Riverhead
- Estate And Property Lawyers & Attorneys, Riverhead
- European Cuisine, Riverhead
- Excavation Contractors, Riverhead - Excavating - Excavator Companies
- Exercise Equipment Repair & Service, Riverhead
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