- Economic Development, Analysis & Research, Smithtown
- Education, Smithtown
- Education & Information Services, Smithtown
- Education Services, Smithtown
- Educational & School Supplies & Equipment, Smithtown - Classroom & Teacher Supply Stores
- Educational Consultants, Smithtown
- Educational Facilities, Smithtown
- Educational Testing Services, Smithtown
- Educators, Smithtown
- Electrical Control Systems & Materials, Smithtown
- Electrical Supplies, Parts & Equipment, Smithtown - Wholesale & Manufacturers
- Electricians, Smithtown - Electrical Contractors
- Electronic Commerce - Internet Services, Smithtown - E-Commerce Shopping
- Electronics Repair & Maintenance , Smithtown
- Electronics Stores, Smithtown
- Elementary Schools, Smithtown
- Embroidery, Smithtown
- Emergency Rooms, Smithtown - Urgent Care Centers
- Emergency Services, Smithtown
- Employment Agencies, Smithtown - Staffing Agencies
- Employment Agencies Medical Services, Smithtown
- Employment And Labor Relations Attorneys & Lawyers, Smithtown
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- Employment Assistance, Smithtown
- Endodontists, Smithtown - Root Canal Specialist
- Engineer & Architect Services, Smithtown - Engineering & Architecture Service
- Engineering Consultants, Smithtown - Consulting Engineers
- ENT, Smithtown - Ears Nose & Throat Doctors, Physicians & Surgeons
- Entertainers & Entertainment Groups, Smithtown
- Entertainers & Groups, Smithtown
- Entertainment & Recreation, Smithtown
- Entertainment Agencies & Bureaus, Smithtown
- Entertainment Consultants, Smithtown
- Entertainment Services, Smithtown
- Environmental Consultants, Smithtown - Ecological Consulting
- Environmental Engineers, Smithtown
- Environmental Products, Smithtown
- Environmental Products & Services, Smithtown
- Estate And Property Attorneys & Lawyers, Smithtown
- Estate And Property Attorneys & Lawyers, Smithtown
- Estate And Property Lawyers & Attorneys, Smithtown
- Ethnic Restaurants, Smithtown
- European Cuisine, Smithtown
- Excavation Contractors, Smithtown - Excavating - Excavator Companies
- Exporters, Smithtown
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