- Economic Development, Lamar
- Education, Lamar
- Education & Information Services, Lamar
- Educational Consultants, Lamar
- Electric Companies, Lamar
- Electric Motor Repair & Service, Lamar
- Electric Motors & Generators , Lamar
- Electrical Control Systems & Materials, Lamar
- Electrical Supplies, Parts & Equipment, Lamar - Wholesale & Manufacturers
- Electricians, Lamar - Electrical Contractors
- Electronic Repair Shops , Lamar
- Electronics Repair & Maintenance , Lamar
- Electronics Stores, Lamar
- Elementary Schools, Lamar
- Emergency Services, Lamar
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- Emergency Victim Services, Lamar
- Employment Services, Lamar
- Engine Rebuild, Repair & Exchange, Lamar
- Engineer & Architect Services, Lamar - Engineering & Architecture Service
- Engineering Consultants, Lamar - Consulting Engineers
- Entertainment & Recreation, Lamar
- Entertainment Services, Lamar
- Environmental Products, Lamar
- Environmental Products & Services, Lamar
- Episcopal Churches, Lamar
- Ethnic Churches, Lamar
- European Cuisine, Lamar
- Excavation Contractors, Lamar - Excavating - Excavator Companies
- Excavation Equipment, Lamar - Excavating & Ditching Equipment
- Exterior Design & Decorator Services, Lamar
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