- Economic Development, Ottawa
- Education, Ottawa
- Education Services, Ottawa
- Education Technology, Ottawa
- Educational Consultants, Ottawa
- Educational Facilities, Ottawa
- Educational Testing Services, Ottawa
- Educators, Ottawa
- Electric Companies, Ottawa
- Electrical Supplies, Parts & Equipment, Ottawa - Wholesale & Manufacturers
- Electricians, Ottawa - Electrical Contractors
- Electronics Repair & Maintenance , Ottawa
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- Electronics Stores, Ottawa
- Elementary Schools, Ottawa
- Embroidery, Ottawa
- Emergency Services, Ottawa
- Emergency Vehicle Accessories, Ottawa
- Employment Agencies, Ottawa - Staffing Agencies
- Engineer & Architect Services, Ottawa - Engineering & Architecture Service
- Engineering Consultants, Ottawa - Consulting Engineers
- Entertainment & Recreation, Ottawa
- Ethnic Goods & Products Stores, Ottawa
- Excavation Contractors, Ottawa - Excavating - Excavator Companies
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