- Economic Development, Middletown
- Editing & Research Services, Middletown
- Education, Middletown
- Educational Consultants, Middletown
- Educational Consultants, Middletown
- Educational Program Administration, Middletown
- Electric Companies, Middletown
- Electrical Control Systems & Materials, Middletown
- Electrical Supplies, Parts & Equipment, Middletown - Wholesale & Manufacturers
- Electricians, Middletown - Electrical Contractors
- Electronic Games Manufacturers, Middletown
- Electronic Repair Shops , Middletown
- Electronic Research, Design & Development, Middletown
- Electronics Manufacturers, Middletown
- Electronics Repair & Maintenance , Middletown
- Electronics Stores, Middletown
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- Elementary Schools, Middletown
- Embroidery, Middletown
- Emergency Services, Middletown
- Emergency Vehicle Accessories, Middletown
- Energy Conservation Consultants, Middletown
- Energy Equipment Systems & Supplies, Middletown
- Engineer & Architect Services, Middletown - Engineering & Architecture Service
- Entertainment & Recreation, Middletown
- Entertainment Equipment & Supplies, Middletown
- Entertainment Services, Middletown
- Environmental Conservation & Ecological Services, Middletown - Ecosystem Services
- Environmental Products, Middletown
- Environmental Services, Middletown
- Equipment Installation Contractors, Middletown
- Evangelical Church, Middletown
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