- Economic Development, Duncanville
- Education, Duncanville
- Education & Information Services, Duncanville
- Educational & School Supplies & Equipment, Duncanville - Classroom & Teacher Supply Stores
- Educational Facilities, Duncanville
- Educators, Duncanville
- Electrical Control Systems & Materials, Duncanville
- Electrical Supplies, Parts & Equipment, Duncanville - Wholesale & Manufacturers
- Electricians, Duncanville - Electrical Contractors
- Electrolysis Treatments, Duncanville
- Electronic Repair Shops , Duncanville
- Electronics Components, Duncanville
- Electronics Manufacturers, Duncanville
- Electronics Repair & Maintenance , Duncanville
- Electronics Stores, Duncanville
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- Elementary Schools, Duncanville
- Elevator & Escalators Sales, Repair & Service, Duncanville
- Embroidery, Duncanville
- Emergency Services, Duncanville
- Employment & Recruiting Consultants, Duncanville - Executive Search Consultants
- Employment Agencies, Duncanville - Staffing Agencies
- Employment Assistance, Duncanville
- Employment Services, Duncanville
- Employment Staff Leasing, Duncanville
- Engine Rebuild, Repair & Exchange, Duncanville
- Engineer & Architect Services, Duncanville - Engineering & Architecture Service
- Entertainment & Recreation, Duncanville
- European Cuisine, Duncanville
- Evangelical Church, Duncanville
- Excavation Contractors, Duncanville - Excavating - Excavator Companies
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