- Eastern Orthodox Church, Potomac
- Education, Potomac
- Education Services, Potomac
- Educational & School Supplies & Equipment, Potomac - Classroom & Teacher Supply Stores
- Educational Consultants, Potomac
- Educational Consultants, Potomac
- Educational Facilities, Potomac
- Educational Testing Services, Potomac
- Educational, Philanthropic & Research Foundations, Potomac
- Educators, Potomac
- Electrical Control Systems & Materials, Potomac
- Electrical Supplies, Parts & Equipment, Potomac - Wholesale & Manufacturers
- Electricians, Potomac - Electrical Contractors
- Electronics Repair & Maintenance , Potomac
- Electronics Stores, Potomac
- Elementary Schools, Potomac
- Emergency Services, Potomac
- Employment Agencies, Potomac - Staffing Agencies
- Employment Assistance, Potomac
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- Employment Consultants Placement Business, Potomac
- Employment Services, Potomac
- Energy & Conservation Agencies, Potomac
- Energy Conservation Consultants, Potomac
- Engineer & Architect Services, Potomac - Engineering & Architecture Service
- Engineering Consultants, Potomac - Consulting Engineers
- Engineering Equipment & Supplies, Potomac
- Engineering Services, Potomac
- Engineers Technical Service, Potomac
- Entertainers & Entertainment Groups, Potomac
- Entertainers & Groups, Potomac
- Entertainment & Recreation, Potomac
- Entertainment Agencies & Bureaus, Potomac
- Entertainment Services, Potomac
- Episcopal Churches, Potomac
- Ethnic Churches, Potomac
- Etiquette & Modeling Schools, Potomac
- European Cuisine, Potomac
- Excavation Contractors, Potomac - Excavating - Excavator Companies
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