- Education, Londonderry
- Education & Information Services, Londonderry
- Educational Facilities, Londonderry
- Eggs & Egg Products, Londonderry
- Elder Care, Londonderry
- Electric Converters, Londonderry
- Electrical Control Systems & Materials, Londonderry
- Electrical Control Systems & Materials, Londonderry
- Electrical Designers, Londonderry
- Electrical Engineer, Londonderry
- Electrical Goods, Londonderry
- Electrical Supplies, Parts & Equipment, Londonderry - Wholesale & Manufacturers
- Electricians, Londonderry - Electrical Contractors
- Electrolysis Treatments, Londonderry
- Electronic Research, Design & Development, Londonderry
- Electronic Testing Equipment, Londonderry
- Electronic, Communications & Electrical Engineers, Londonderry
- Electronics Manufacturers, Londonderry
- Electronics Repair & Maintenance , Londonderry
- Electronics Stores, Londonderry
- Elementary Schools, Londonderry
- Elevator Contractors, Londonderry
- Embroidery, Londonderry
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- Emergency Services, Londonderry
- Employment & Recruiting Consultants, Londonderry - Executive Search Consultants
- Employment Agencies, Londonderry - Staffing Agencies
- Employment Agencies Medical Services, Londonderry
- Employment Assistance, Londonderry
- Energy Services, Londonderry
- Engineer & Architect Services, Londonderry - Engineering & Architecture Service
- Engineering Consultants, Londonderry - Consulting Engineers
- Entertainment & Recreation, Londonderry
- Entertainment Services, Londonderry
- Environmental Consultants, Londonderry - Ecological Consulting
- Environmental Products, Londonderry
- Environmental Services, Londonderry
- Environmental Services Water Treatment Services, Londonderry
- Episcopal Churches, Londonderry
- Estate And Property Attorneys & Lawyers, Londonderry
- Estate And Property Attorneys & Lawyers, Londonderry
- Estate And Property Lawyers & Attorneys, Londonderry
- European Cuisine, Londonderry
- Excavation Contractors, Londonderry - Excavating - Excavator Companies
- Exercise Equipment Repair & Service, Londonderry
- Exercise Equipment Stores, Londonderry - Fitness & Gym Equipment
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