- Bakeries, Middleton
- Baking Supplies & Needs, Middleton - Flavoring Extracts, Flour & More
- Bank Supplies & Equipment, Middleton
- Banks, Middleton
- Banquet Halls, Middleton
- Barber Shops, Middleton
- Barbers, Middleton
- Bars, Middleton
- Bars & Grills, Middleton
- Baseball & Softball Batting Ranges, Middleton
- Bathroom Remodeling, Middleton - Bathroom Remodel & Planning Services
- Bathtub, Sink & Tile Contractors, Middleton - Installation & Repair Services
- Beauty Salons, Middleton
- Beef Restaurants, Middleton
- Beer Taverns, Middleton
- Beverage Stores, Middleton
- Bicycle Rentals, Middleton - Bike Rental
- Bicycle Repair & Service, Middleton - Bike Repair Shops
- Billing Services, Middleton
- Boat Services, Middleton
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- Boat Storage , Middleton - Equipment & Services
- Boats & Yachts, Middleton - Yachts, Sailboats & Boats for Sale
- Bonds, Middleton
- Boot Manufacturers, Middleton
- Boots Retail, Middleton
- Brake Service & Repair, Middleton - Brake Pads
- Breakfast Restaurants, Middleton
- Brick Masonry & Bricklayer Contractors, Middleton - Brick Mason - Install & Repair
- Builders & Contractors, Middleton
- Builders & Contractors - More, Middleton
- Building Construction Consultants, Middleton - Construction Management & Consulting
- Building Design & Construction Consultants, Middleton
- Building Materials & Supplies, Middleton
- Business Brokers, Middleton
- Business Forms, Systems & Supplies, Middleton
- Business Legal Services, Middleton
- Business Management Consultants, Middleton
- Business Services, Middleton
- Business, Vocational & Technical, Middleton
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