- Economic Consultants, Duncan
- Economic Development, Analysis & Research, Duncan
- Economic Research Consultants, Duncan
- Education, Duncan
- Educational, Philanthropic & Research Foundations, Duncan
- Electric Companies, Duncan
- Electric Motor Repair & Service, Duncan
- Electric Motors & Generators , Duncan
- Electrical Control Systems & Materials, Duncan
- Electrical Supplies, Parts & Equipment, Duncan - Wholesale & Manufacturers
- Electricians, Duncan - Electrical Contractors
- Electronic Research, Design & Development, Duncan
- Electronics Repair & Maintenance , Duncan
- Electronics Stores, Duncan
- Elementary Schools, Duncan
- Embroidery, Duncan
- Emergency Rooms, Duncan - Urgent Care Centers
- Emergency Services, Duncan
- Emergency Vehicle Accessories, Duncan
- Emergency Victim Services, Duncan
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- Employment Agencies, Duncan - Staffing Agencies
- Employment Assistance, Duncan
- Employment Information, Duncan
- Employment Services, Duncan
- Energy & Conservation Agencies, Duncan
- Energy Conservation Consultants, Duncan
- Energy Services, Duncan
- Engine Parts & Equipment, Duncan
- Engine Starters, Duncan
- Engineer & Architect Services, Duncan - Engineering & Architecture Service
- ENT, Duncan - Ears Nose & Throat Doctors, Physicians & Surgeons
- Entertainment & Recreation, Duncan
- Environmental Consultants, Duncan - Ecological Consulting
- Episcopal Churches, Duncan
- Equestrian Services, Duncan - Riding Boots, Helmets, Horse Equipment, Clothing, Tack, etc
- Escrow Service, Duncan
- European Cuisine, Duncan
- Excavation Contractors, Duncan - Excavating - Excavator Companies
- Exercise Equipment Repair & Service, Duncan
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