- Eastern Orthodox Church, Beltsville
- Economic Development, Analysis & Research, Beltsville
- Education, Beltsville
- Educational Facilities, Beltsville
- Electric Companies, Beltsville
- Electric Meters, Beltsville
- Electric Motors & Generators , Beltsville
- Electrical Control Systems & Materials, Beltsville
- Electrical Supplies, Parts & Equipment, Beltsville - Wholesale & Manufacturers
- Electricians, Beltsville - Electrical Contractors
- Electronic Repair Shops , Beltsville
- Electronic Research, Design & Development, Beltsville
- Electronic Testing Equipment, Beltsville
- Electronics Manufacturers, Beltsville
- Electronics Repair & Maintenance , Beltsville
- Electronics Stores, Beltsville
- Elementary Schools, Beltsville
- Elevator & Escalators Sales, Repair & Service, Beltsville
- Embossing, Stamping & Engraving, Beltsville
- Emergency Services, Beltsville
- Emergency Vehicle Accessories, Beltsville
- Emergency Victim Services, Beltsville
- Employment Agencies, Beltsville - Staffing Agencies
- Energy & Conservation Agencies, Beltsville
- Energy Conservation Consultants, Beltsville
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- Energy Services, Beltsville
- Engineer & Architect Services, Beltsville - Engineering & Architecture Service
- Engineering Consultants, Beltsville - Consulting Engineers
- Engravers & Typesetting Printers, Beltsville
- Engraving & Platemaking, Beltsville
- Engraving - Wood, Plastic, Jewelry, Etc, Beltsville - Engraver
- Engraving Machine, Supplies & Equipment, Beltsville
- Entertainers & Entertainment Groups, Beltsville
- Entertainment & Recreation, Beltsville
- Entertainment Agencies & Bureaus, Beltsville
- Entertainment Services, Beltsville
- Envelopes Manufacturers, Beltsville
- Envelopes, Paper & Stationery, Beltsville - Office Supplies
- Environmental Products, Beltsville
- Environmental Products & Services, Beltsville
- Episcopal Churches, Beltsville
- Equipment Installation Contractors, Beltsville
- Ethnic Churches, Beltsville
- Ethnic Goods & Products Stores, Beltsville
- Ethnic Restaurants, Beltsville
- European Cuisine, Beltsville
- Evangelical Church, Beltsville
- Excavation Contractors, Beltsville - Excavating - Excavator Companies
- Excavation Equipment, Beltsville - Excavating & Ditching Equipment
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