- Education, West Islip
- Educational Consultants, West Islip
- Educational Consultants, West Islip
- Electric Motors & Generators , West Islip
- Electrical Control Systems & Materials, West Islip
- Electricians, West Islip - Electrical Contractors
- Electronics Manufacturers, West Islip
- Electronics Stores, West Islip
- Elementary Schools, West Islip
- Emergency Services, West Islip
- Emergency Victim Services, West Islip
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- Endodontists, West Islip - Root Canal Specialist
- Energy & Conservation Agencies, West Islip
- Engineer & Architect Services, West Islip - Engineering & Architecture Service
- Entertainers & Entertainment Groups, West Islip
- Entertainment Agencies & Bureaus, West Islip
- Entertainment Consultants, West Islip
- Entertainment Services, West Islip
- Environmental Groups, West Islip
- Environmental Products, West Islip
- European Cuisine, West Islip
- Excavation Contractors, West Islip - Excavating - Excavator Companies
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