- Ear & Body Piercing, South Portland
- Economic Development, Analysis & Research, South Portland
- Education, South Portland
- Education & Information Services, South Portland
- Education Services, South Portland
- Education Technology, South Portland
- Educational & School Supplies & Equipment, South Portland - Classroom & Teacher Supply Stores
- Educational Consultants, South Portland
- Educational Consultants, South Portland
- Educational Facilities, South Portland
- Educational Financing, South Portland
- Educational Testing Services, South Portland
- Educational, Philanthropic & Research Foundations, South Portland
- Educators, South Portland
- Electric Companies, South Portland
- Electric Motors & Generators , South Portland
- Electrical Contractors Referral Service, South Portland
- Electrical Control Systems & Materials, South Portland
- Electrical Engineer, South Portland
- Electrical Supplies, Parts & Equipment, South Portland - Wholesale & Manufacturers
- Electricians, South Portland - Electrical Contractors
- Electronic Research, Design & Development, South Portland
- Electronic, Communications & Electrical Engineers, South Portland
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- Electronics Repair & Maintenance , South Portland
- Electronics Stores, South Portland
- Elementary Schools, South Portland
- Elevator & Escalators Sales, Repair & Service, South Portland
- Emergency Medical Identification, South Portland
- Employment Agencies, South Portland - Staffing Agencies
- Employment Assistance, South Portland
- Engineer & Architect Services, South Portland - Engineering & Architecture Service
- Engineering Consultants, South Portland - Consulting Engineers
- Entertainment & Recreation, South Portland
- Environmental Conservation & Ecological Services, South Portland - Ecosystem Services
- Environmental Engineers, South Portland
- Environmental Groups, South Portland
- Environmental Products, South Portland
- Environmental Products & Services, South Portland
- Environmental Services, South Portland
- Estate And Property Attorneys & Lawyers, South Portland
- Estate And Property Attorneys & Lawyers, South Portland
- Estate And Property Lawyers & Attorneys, South Portland
- Ethan Allen Furniture Stores, South Portland
- European Cuisine, South Portland
- Exercise Equipment Stores, South Portland - Fitness & Gym Equipment
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