- Ear & Body Piercing, West Mifflin
- Eastern Orthodox Church, West Mifflin
- Education, West Mifflin
- Education & Information Services, West Mifflin
- Educational Consultants, West Mifflin
- Educational Consultants, West Mifflin
- Electric Companies, West Mifflin
- Electricians, West Mifflin - Electrical Contractors
- Electronics Repair & Maintenance , West Mifflin
- Electronics Stores, West Mifflin
- Elementary Schools, West Mifflin
- Emergency Services, West Mifflin
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- Energy Equipment Systems & Supplies, West Mifflin
- Engineer & Architect Services, West Mifflin - Engineering & Architecture Service
- Engineers Environmental Pollution Control, West Mifflin
- Engineers Industrial, West Mifflin
- Entertainment & Recreation, West Mifflin
- Environmental Conservation & Ecological Services, West Mifflin - Ecosystem Services
- Environmental Engineers, West Mifflin
- Environmental Products, West Mifflin
- Environmental Services, West Mifflin
- Environmental Services Analysis, West Mifflin
- European Cuisine, West Mifflin
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