- Education, Catonsville
- Educational & School Supplies & Equipment, Catonsville - Classroom & Teacher Supply Stores
- Electric Companies, Catonsville
- Electric Contractors Commercial & Industrial, Catonsville
- Electric Motors & Generators , Catonsville
- Electric Signs, Catonsville
- Electrical Control Systems & Materials, Catonsville
- Electrical Power Systems, Catonsville
- Electrical Supplies, Parts & Equipment, Catonsville - Wholesale & Manufacturers
- Electricians, Catonsville - Electrical Contractors
- Electronic Equipment, Parts & Supplies, Catonsville
- Electronics Repair & Maintenance , Catonsville
- Electronics Stores, Catonsville
- Elementary Schools, Catonsville
- Embroidery, Catonsville
- Emergency Services, Catonsville
- Employment Agencies, Catonsville - Staffing Agencies
- Employment Agencies General Labor, Catonsville
- Employment Agencies Medical Services, Catonsville
- Employment Assistance, Catonsville
- Employment Services, Catonsville
- Endodontists, Catonsville - Root Canal Specialist
- Energy & Conservation Agencies, Catonsville
- Energy Conservation Consultants, Catonsville
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- Engineer & Architect Services, Catonsville - Engineering & Architecture Service
- Engineering Consultants, Catonsville - Consulting Engineers
- Entertainers & Entertainment Groups, Catonsville
- Entertainers & Groups, Catonsville
- Entertainment & Recreation, Catonsville
- Entertainment Agencies & Bureaus, Catonsville
- Entertainment Services, Catonsville
- Entomologists, Catonsville
- Environmental Conservation & Ecological Services, Catonsville - Ecosystem Services
- Environmental Products, Catonsville
- Environmental Products & Services, Catonsville
- Environmental Services, Catonsville
- Episcopal Churches, Catonsville
- Erosion Control, Catonsville
- Estate And Property Attorneys & Lawyers, Catonsville
- Estate And Property Attorneys & Lawyers, Catonsville
- Estate And Property Lawyers & Attorneys, Catonsville
- Ethan Allen Furniture Stores, Catonsville
- Ethnic Restaurants, Catonsville
- European Cuisine, Catonsville
- Excavation Contractors, Catonsville - Excavating - Excavator Companies
- Exercise Equipment Repair & Service, Catonsville
- Exporters, Catonsville
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