- Education, Northport
- Education & Information Services, Northport
- Educational & School Supplies & Equipment, Northport - Classroom & Teacher Supply Stores
- Educational, Philanthropic & Research Foundations, Northport
- Electric Companies, Northport
- Electric Motors & Generators , Northport
- Electrical Control Systems & Materials, Northport
- Electrical Supplies, Parts & Equipment, Northport - Wholesale & Manufacturers
- Electricians, Northport - Electrical Contractors
- Electronic Repair Shops , Northport
- Electronics Funds Transfer, Northport
- Electronics Manufacturers, Northport
- Electronics Repair & Maintenance , Northport
- Electronics Stores, Northport
- Elementary Schools, Northport
- Embossing, Stamping & Engraving, Northport
- Embroidery, Northport
- Emergency Services, Northport
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- Employment Agencies, Northport - Staffing Agencies
- Employment And Labor Relations Attorneys & Lawyers, Northport
- Energy Services, Northport
- Engine Rebuild, Repair & Exchange, Northport
- Engineer & Architect Services, Northport - Engineering & Architecture Service
- Entertainers & Entertainment Groups, Northport
- Entertainment & Recreation, Northport
- Entertainment Agencies & Bureaus, Northport
- Entertainment Services, Northport
- Environmental Consultants, Northport - Ecological Consulting
- Environmental Engineers, Northport
- Estate And Property Attorneys & Lawyers, Northport
- Estate And Property Attorneys & Lawyers, Northport
- Estate And Property Lawyers & Attorneys, Northport
- European Cuisine, Northport
- Excavation Contractors, Northport - Excavating - Excavator Companies
- Export Nonclassifiable, Northport
- Exporters, Northport
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