- Baby Stores, West Mifflin - Baby Accessories & Clothes
- Bakeries, West Mifflin
- Banks, West Mifflin
- Baptist Churches, West Mifflin
- Barbers, West Mifflin
- Bars, West Mifflin
- Bars & Grills, West Mifflin
- Bath Equipment & Supplies, West Mifflin
- Bathroom Remodeling, West Mifflin - Bathroom Remodel & Planning Services
- Beauty Salons, West Mifflin
- Bedroom Furniture Stores, West Mifflin - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Ale - Wholesale, West Mifflin
- Beer & Wine Stores, West Mifflin
- Beer Taverns, West Mifflin
- Beverages, West Mifflin
- Bicycle Rentals, West Mifflin - Bike Rental
- Bicycle Repair & Service, West Mifflin - Bike Repair Shops
- Bistros, West Mifflin
- Boat Services, West Mifflin
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- Boat Storage , West Mifflin - Equipment & Services
- Book Stores, West Mifflin
- Books, Magazines & Newspapers Stores, West Mifflin - Bookstores
- Boutiques & Boutique Items, West Mifflin
- Bowling Centers, West Mifflin
- Brick Clay Common Face, West Mifflin
- Bricks, Blocks & Stone Products, West Mifflin - Companies, Wholesale, Manufacturers & Suppliers
- Buffet Restaurants, West Mifflin
- Builders & Contractors, West Mifflin
- Builders & Contractors - More, West Mifflin
- Builders Hardware Stores, West Mifflin
- Building Construction Consultants, West Mifflin - Construction Management & Consulting
- Building Materials, West Mifflin - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, West Mifflin
- Business & Professional Associations, West Mifflin
- Business Brokers, West Mifflin
- Business Legal Services, West Mifflin
- Business Services, West Mifflin
- Business, Vocational & Technical, West Mifflin
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