- Education, West Haven
- Education Services, West Haven
- Educational Testing Services, West Haven
- Electric Companies, West Haven
- Electrical Control Systems & Materials, West Haven
- Electrical Engineer, West Haven
- Electrical Supplies, Parts & Equipment, West Haven - Wholesale & Manufacturers
- Electricians, West Haven - Electrical Contractors
- Electronic, Communications & Electrical Engineers, West Haven
- Electronics Manufacturers, West Haven
- Electronics Repair & Maintenance , West Haven
- Electronics Stores, West Haven
- Elementary Schools, West Haven
- Embossing, Stamping & Engraving, West Haven
- Embroidery & Needlework Materials & Supplies Retail, West Haven
- Emergency Rooms, West Haven - Urgent Care Centers
- Employment Agencies, West Haven - Staffing Agencies
- Employment And Labor Relations Attorneys & Lawyers, West Haven
- Employment Assistance, West Haven
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- Endocrinologists, West Haven - Endocrinology, Diabetes & Metabolism Doctors, Physicians & Surgeons
- Energy & Conservation Agencies, West Haven
- Energy Conservation Consultants, West Haven
- Energy Services, West Haven
- Engine Manufacturers, West Haven
- Engineer & Architect Services, West Haven - Engineering & Architecture Service
- Engineering Consultants, West Haven - Consulting Engineers
- Environmental Products, West Haven
- Environmental Products & Services, West Haven
- Equipment Installation Contractors, West Haven
- Estate And Property Attorneys & Lawyers, West Haven
- Estate And Property Attorneys & Lawyers, West Haven
- Estate And Property Lawyers & Attorneys, West Haven
- Ethnic Goods & Products Stores, West Haven
- European Cuisine, West Haven
- Excavation Contractors, West Haven - Excavating - Excavator Companies
- Export Services, West Haven
- Exporters, West Haven
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