- Education, Northborough
- Educators, Northborough
- Electric Companies, Northborough
- Electrical Control Systems & Materials, Northborough
- Electrical Supplies, Parts & Equipment, Northborough - Wholesale & Manufacturers
- Electricians, Northborough - Electrical Contractors
- Electrolysis Treatments, Northborough
- Electronic Research, Design & Development, Northborough
- Electronics Manufacturers, Northborough
- Electronics Stores, Northborough
- Elementary Schools, Northborough
- Employee Benefit & Compensation Plans, Northborough
- Employment & Recruiting Consultants, Northborough - Executive Search Consultants
- Employment Agencies, Northborough - Staffing Agencies
- Employment Assistance, Northborough
- Energy & Conservation Agencies, Northborough
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- Energy Conservation Consultants, Northborough
- Engineer & Architect Services, Northborough - Engineering & Architecture Service
- Engineering Consultants, Northborough - Consulting Engineers
- Entertainment & Recreation, Northborough
- Environmental Conservation & Ecological Services, Northborough - Ecosystem Services
- Environmental Consultants, Northborough - Ecological Consulting
- Environmental Engineers, Northborough
- Environmental Products, Northborough
- Environmental Products & Services, Northborough
- Environmental Services, Northborough
- Episcopal Churches, Northborough
- European Cuisine, Northborough
- Event Planning & Coordinating Consultants, Northborough
- Exercise Equipment Stores, Northborough - Fitness & Gym Equipment
- Exporters, Northborough
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