- Economic Development, Prineville
- Education, Prineville
- Education & Information Services, Prineville
- Educational Facilities, Prineville
- Electric Companies, Prineville
- Electric Motors & Generators , Prineville
- Electrical Control Systems & Materials, Prineville
- Electrical Supplies, Parts & Equipment, Prineville - Wholesale & Manufacturers
- Electricians, Prineville - Electrical Contractors
- Electronic Equipment, Parts & Supplies, Prineville
- Electronics Repair & Maintenance , Prineville
- Electronics Stores, Prineville
- Emergency Services, Prineville
- Emergency Victim Services, Prineville
- Employment Agencies, Prineville - Staffing Agencies
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- Employment Assistance, Prineville
- Energy & Conservation Agencies, Prineville
- Engineer & Architect Services, Prineville - Engineering & Architecture Service
- Entertainers & Entertainment Groups, Prineville
- Entertainment & Recreation, Prineville
- Entertainment Agencies & Bureaus, Prineville
- Entertainment Services, Prineville
- Environmental Conservation & Ecological Services, Prineville - Ecosystem Services
- Environmental Products, Prineville
- Environmental Products & Services, Prineville
- Environmental Services, Prineville
- Episcopal Churches, Prineville
- European Cuisine, Prineville
- Excavation Contractors, Prineville - Excavating - Excavator Companies
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