- Economic Development, Omak
- Education, Omak
- Education & Information Services, Omak
- Educational Program Administration, Omak
- Electricians, Omak - Electrical Contractors
- Electronics Stores, Omak
- Elementary Schools, Omak
- Embroidery, Omak
- Embroidery Machine, Omak
- Emergency Services, Omak
- Emergency Vehicle Accessories, Omak
- Emergency Victim Services, Omak
- Employment Agencies, Omak - Staffing Agencies
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- Engine Rebuild, Repair & Exchange, Omak
- Engineer & Architect Services, Omak - Engineering & Architecture Service
- Engineering Services, Omak
- Engineers Refrigeration, Omak
- Engines Gasoline Repair & Service, Omak
- Entertainment & Recreation, Omak
- Episcopal Churches, Omak
- Escrow Service, Omak
- Ethnic Goods & Products Stores, Omak
- European Cuisine, Omak
- Excavation Contractors, Omak - Excavating - Excavator Companies
- Exterior Design & Decorator Services, Omak
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