- Education, Port Jefferson
- Educational Consultants, Port Jefferson
- Educational, Philanthropic & Research Foundations, Port Jefferson
- Educators, Port Jefferson
- Electric Companies, Port Jefferson
- Electrical Control Systems & Materials, Port Jefferson
- Electrical Supplies, Parts & Equipment, Port Jefferson - Wholesale & Manufacturers
- Electricians, Port Jefferson - Electrical Contractors
- Electronics Repair & Maintenance , Port Jefferson
- Electronics Stores, Port Jefferson
- Elementary Schools, Port Jefferson
- Elevator & Escalators Sales, Repair & Service, Port Jefferson
- Emergency Services, Port Jefferson
- Employment & Recruiting Consultants, Port Jefferson - Executive Search Consultants
- Employment Agencies, Port Jefferson - Staffing Agencies
- Endodontists, Port Jefferson - Root Canal Specialist
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- Engineer & Architect Services, Port Jefferson - Engineering & Architecture Service
- Engineering Consultants, Port Jefferson - Consulting Engineers
- ENT, Port Jefferson - Ears Nose & Throat Doctors, Physicians & Surgeons
- Entertainers & Groups, Port Jefferson
- Entertainment & Recreation, Port Jefferson
- Entertainment Services, Port Jefferson
- Environmental Conservation & Ecological Services, Port Jefferson - Ecosystem Services
- Environmental Products, Port Jefferson
- Environmental Services, Port Jefferson
- Episcopal Churches, Port Jefferson
- Estate And Property Attorneys & Lawyers, Port Jefferson
- Estate And Property Lawyers & Attorneys, Port Jefferson
- Ethnic Churches, Port Jefferson
- European Cuisine, Port Jefferson
- Excavation Contractors, Port Jefferson - Excavating - Excavator Companies
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