- Eastern Orthodox Church, Clarksburg
- Education, Clarksburg
- Education & Information Services, Clarksburg
- Education Services, Clarksburg
- Electric Companies, Clarksburg
- Electric Insulation Materials, Clarksburg
- Electric Motor Repair & Service, Clarksburg
- Electric Motors & Generators , Clarksburg
- Electrical Control Systems & Materials, Clarksburg
- Electrical Heating Systems, Clarksburg
- Electrical Supplies, Parts & Equipment, Clarksburg - Wholesale & Manufacturers
- Electricians, Clarksburg - Electrical Contractors
- Electronics Repair & Maintenance , Clarksburg
- Electronics Stores, Clarksburg
- Elementary Schools, Clarksburg
- Embroidery, Clarksburg
- Emergency Services, Clarksburg
- Emergency Victim Services, Clarksburg
- Employment Agencies, Clarksburg - Staffing Agencies
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- Employment Agencies General Labor, Clarksburg
- Employment And Labor Relations Attorneys & Lawyers, Clarksburg
- Employment Assistance, Clarksburg
- Employment Consultants Placement Business, Clarksburg
- Energy & Conservation Agencies, Clarksburg
- Engine Rebuild, Repair & Exchange, Clarksburg
- Engineer & Architect Services, Clarksburg - Engineering & Architecture Service
- Engineering Consultants, Clarksburg - Consulting Engineers
- Engineers Sanitary, Clarksburg
- Entertainers & Groups, Clarksburg
- Entertainment & Recreation, Clarksburg
- Environmental Engineers, Clarksburg
- Environmental Products, Clarksburg
- Episcopal Churches, Clarksburg
- Estate And Property Attorneys & Lawyers, Clarksburg
- Estate And Property Lawyers & Attorneys, Clarksburg
- Ethnic Churches, Clarksburg
- European Cuisine, Clarksburg
- Excavation Contractors, Clarksburg - Excavating - Excavator Companies
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