- Bakeries, Middlefield
- Balloons - Novelty, Toy & Decorative, Middlefield
- Banks, Middlefield
- Barbers, Middlefield
- Bars, Middlefield
- Bars & Grills, Middlefield
- Bathroom Fixtures, Middlefield - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Middlefield - Bathroom Remodel & Planning Services
- Battery, Middlefield - Retail Batteries Stores
- Battery Storage, Middlefield
- Beauty Salons, Middlefield
- Bedroom Furniture Stores, Middlefield - Master & Kids Bedroom Furniture Sets & Beds
- Beer Taverns, Middlefield
- Beverage Stores, Middlefield
- Book Stores, Middlefield
- Bookcases & Bookstands, Middlefield
- Bookkeeping Services Licensed, Middlefield
- Bookkeeping Systems & Services, Middlefield
- Books, Magazines & Newspapers Stores, Middlefield - Bookstores
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- Bottled Gas, Lp Gas & Propane Dealers, Middlefield
- Box Manufacturers Equipment & Supplies, Middlefield
- Breakfast Restaurants, Middlefield
- Brick Masonry & Bricklayer Contractors, Middlefield - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Middlefield - Companies, Wholesale, Manufacturers & Suppliers
- Buffet Restaurants, Middlefield
- Builders & Contractors, Middlefield
- Builders & Contractors - More, Middlefield
- Builders Hardware Stores, Middlefield
- Building Construction Consultants, Middlefield - Construction Management & Consulting
- Building Hardware & Materials, Middlefield
- Building Materials, Middlefield - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Middlefield
- Building Site Preparation Contractors, Middlefield - Land Preparation & Land Clearing
- Bulk Food Stores, Middlefield
- Business & Professional Associations, Middlefield
- Business Legal Services, Middlefield
- Business Services, Middlefield
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