- Education, Lorton
- Educational Facilities, Lorton
- Electric Companies, Lorton
- Electric Motor Repair & Service, Lorton
- Electric Motors & Generators , Lorton
- Electrical Control Systems & Materials, Lorton
- Electrical Supplies, Parts & Equipment, Lorton - Wholesale & Manufacturers
- Electricians, Lorton - Electrical Contractors
- Electronic Research, Design & Development, Lorton
- Electronics Components, Lorton
- Electronics Manufacturers, Lorton
- Electronics Repair & Maintenance , Lorton
- Electronics Stores, Lorton
- Elementary Schools, Lorton
- Elevator & Escalators Sales, Repair & Service, Lorton
- Elevator Contractors, Lorton
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- Emergency Services, Lorton
- Energy & Conservation Agencies, Lorton
- Engine Parts & Equipment, Lorton
- Engineer & Architect Services, Lorton - Engineering & Architecture Service
- Engineering Consultants, Lorton - Consulting Engineers
- Entertainment & Recreation, Lorton
- Environmental Conservation & Ecological Services, Lorton - Ecosystem Services
- Environmental Engineers, Lorton
- Environmental Products, Lorton
- Environmental Services, Lorton
- Episcopal Churches, Lorton
- Ergonomic Consultants & Products, Lorton
- Ethnic Societies, Lorton
- European Cuisine, Lorton
- Evangelical Church, Lorton
- Event Planning & Coordinating Consultants, Lorton
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