- Education, Ottawa
- Education & Information Services, Ottawa
- Electric Companies, Ottawa
- Electrical Supplies, Parts & Equipment, Ottawa - Wholesale & Manufacturers
- Electricians, Ottawa - Electrical Contractors
- Electronics Repair & Maintenance , Ottawa
- Electronics Stores, Ottawa
- Elementary Schools, Ottawa
- Emergency Services, Ottawa
- Emergency Vehicle Accessories, Ottawa
- Employee Counseling Services, Ottawa
- Employment & Recruiting Services, Ottawa
- Employment Agencies, Ottawa - Staffing Agencies
- Employment And Labor Relations Attorneys & Lawyers, Ottawa
- Employment Assistance, Ottawa
- Employment Information, Ottawa
- Employment Services, Ottawa
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- Engine Parts & Equipment, Ottawa
- Engine Rebuild, Repair & Exchange, Ottawa
- Engineer & Architect Services, Ottawa - Engineering & Architecture Service
- Engineering Consultants, Ottawa - Consulting Engineers
- ENT, Ottawa - Ears Nose & Throat Doctors, Physicians & Surgeons
- Entertainment & Recreation, Ottawa
- Environmental Conservation & Ecological Services, Ottawa - Ecosystem Services
- Environmental Products, Ottawa
- Environmental Services, Ottawa
- Episcopal Churches, Ottawa
- Estate And Property Attorneys & Lawyers, Ottawa
- Estate And Property Attorneys & Lawyers, Ottawa
- Estate And Property Lawyers & Attorneys, Ottawa
- Estate Appraisal, Liquidation & Sales, Ottawa
- European Cuisine, Ottawa
- Evangelical Church, Ottawa
- Excavation Contractors, Ottawa - Excavating - Excavator Companies
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