- Ear & Body Piercing, Frederick
- Eastern Orthodox Church, Frederick
- Education, Frederick
- Education & Information Services, Frederick
- Education Services, Frederick
- Education Technology, Frederick
- Educational Consultants, Frederick
- Educational Consultants, Frederick
- Educational Facilities, Frederick
- Educational Research, Frederick
- Educational Testing Services, Frederick
- Educational, Philanthropic & Research Foundations, Frederick
- Educators, Frederick
- Elder Care, Frederick
- Electric Companies, Frederick
- Electric Motor Repair & Service, Frederick
- Electric Motors & Generators , Frederick
- Electrical Control Systems & Materials, Frederick
- Electrical Supplies, Parts & Equipment, Frederick - Wholesale & Manufacturers
- Electricians, Frederick - Electrical Contractors
- Electrolysis Treatments, Frederick
- Electronic Commerce - Internet Services, Frederick - E-Commerce Shopping
- Electronic Games Manufacturers, Frederick
- Electronic Repair Shops , Frederick
- Electronic Research, Design & Development, Frederick
- Electronic, Communications & Electrical Engineers, Frederick
- Electronics Components, Frederick
- Electronics Manufacturers, Frederick
- Electronics Repair & Maintenance , Frederick
- Electronics Stores, Frederick
- Elementary Schools, Frederick
- Elevator & Escalators Sales, Repair & Service, Frederick
- Elevator Contractors, Frederick
- Embroidery, Frederick
- Embroidery & Needlework Materials & Supplies Retail, Frederick
- Emergency Rooms, Frederick - Urgent Care Centers
- Emergency Services, Frederick
- Emergency Vehicle Accessories, Frederick
- Emergency Victim Services, Frederick
- Emissions Testing, Frederick - Smog Check
- Employment Agencies, Frederick - Staffing Agencies
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- Employment Agencies Clerical Services, Frederick
- Employment Agencies General Labor, Frederick
- Employment And Labor Relations Attorneys & Lawyers, Frederick
- Employment Assistance, Frederick
- Employment Consultants Placement Business, Frederick
- Employment Services, Frederick
- Employment Staff Leasing, Frederick
- Endocrinologists, Frederick - Endocrinology, Diabetes & Metabolism Doctors, Physicians & Surgeons
- Endodontists, Frederick - Root Canal Specialist
- Energy & Conservation Agencies, Frederick
- Energy Conservation Consultants, Frederick
- Energy Conservation Products & Service, Frederick
- Energy Services, Frederick
- Engineer & Architect Services, Frederick - Engineering & Architecture Service
- Engineering Consultants, Frederick - Consulting Engineers
- Engineering Services, Frederick
- Engineers Technical Service, Frederick
- Entertainers & Entertainment Groups, Frederick
- Entertainers & Groups, Frederick
- Entertainment & Recreation, Frederick
- Entertainment Agencies & Bureaus, Frederick
- Entertainment Services, Frederick
- Environmental Conservation & Ecological Services, Frederick - Ecosystem Services
- Environmental Consultants, Frederick - Ecological Consulting
- Environmental Engineers, Frederick
- Environmental Products, Frederick
- Environmental Services, Frederick
- Environmental Services Analysis, Frederick
- Environmental Services Monitoring, Frederick
- Episcopal Churches, Frederick
- Equipment Installation Contractors, Frederick
- Estate And Property Attorneys & Lawyers, Frederick
- Estate And Property Attorneys & Lawyers, Frederick
- Estate And Property Lawyers & Attorneys, Frederick
- Ethan Allen Furniture Stores, Frederick
- Ethnic Churches, Frederick
- European Cuisine, Frederick
- Excavation Contractors, Frederick - Excavating - Excavator Companies
- Executive Suites & Offices For Rent, Frederick
- Exercise Equipment Repair & Service, Frederick
- Exporters, Frederick
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