- Education, Northport
- Education Services, Northport
- Educational Consultants, Northport
- Educational Testing Services, Northport
- Educators, Northport
- Electric Companies, Northport
- Electrical Engineer, Northport
- Electrical Supplies, Parts & Equipment, Northport - Wholesale & Manufacturers
- Electricians, Northport - Electrical Contractors
- Electronic, Communications & Electrical Engineers, Northport
- Electronics Manufacturers, Northport
- Electronics Stores, Northport
- Elementary Schools, Northport
- Emergency Services, Northport
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- Employee Benefit & Compensation Plans, Northport
- Employment Agencies, Northport - Staffing Agencies
- Employment Agencies Medical Services, Northport
- Energy & Conservation Agencies, Northport
- Engineer & Architect Services, Northport - Engineering & Architecture Service
- Engineering Consultants, Northport - Consulting Engineers
- Entertainment & Recreation, Northport
- Environmental Consultants, Northport - Ecological Consulting
- Environmental Products, Northport
- Environmental Products & Services, Northport
- Episcopal Churches, Northport
- Ethnic Goods & Products Stores, Northport
- European Cuisine, Northport
- Excavation Contractors, Northport - Excavating - Excavator Companies
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