- Eastern Orthodox Church, Southbury
- Economic Development, Southbury
- Education, Southbury
- Education Services, Southbury
- Education Technology, Southbury
- Educational Consultants, Southbury
- Educational Facilities, Southbury
- Educational Testing Services, Southbury
- Educators, Southbury
- Electrical Control Systems & Materials, Southbury
- Electrical Supplies, Parts & Equipment, Southbury - Wholesale & Manufacturers
- Electricians, Southbury - Electrical Contractors
- Electronic Testing Equipment, Southbury
- Electronics Repair & Maintenance , Southbury
- Electronics Stores, Southbury
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- Elementary Schools, Southbury
- Emergency Rooms, Southbury - Urgent Care Centers
- Emergency Services, Southbury
- Emergency Vehicle Accessories, Southbury
- Emergency Victim Services, Southbury
- Employment Agencies, Southbury - Staffing Agencies
- Employment Assistance, Southbury
- Endodontists, Southbury - Root Canal Specialist
- Energy Services, Southbury
- Engineer & Architect Services, Southbury - Engineering & Architecture Service
- Engineering Consultants, Southbury - Consulting Engineers
- Entertainment & Recreation, Southbury
- Episcopal Churches, Southbury
- Excavation Contractors, Southbury - Excavating - Excavator Companies
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