- Bakeries, Middleburg
- Balloons, Middleburg
- Balloons - Novelty, Toy & Decorative, Middleburg
- Banks, Middleburg
- Banquet Halls, Middleburg
- Baptist Churches, Middleburg
- Barbers, Middleburg
- Bars, Middleburg
- Bars & Grills, Middleburg
- Beauty Salons, Middleburg
- Bed & Breakfast, Middleburg
- Beer & Wine Stores, Middleburg
- Beer Taverns, Middleburg
- Beverage Stores, Middleburg
- Boating & Swimming Clubs, Middleburg
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- Book Stores, Middleburg
- Bookkeeping Services Licensed, Middleburg
- Bookkeeping Systems & Services, Middleburg
- Books, Magazines & Newspapers Stores, Middleburg - Bookstores
- Boutiques & Boutique Items, Middleburg
- Builders & Contractors, Middleburg
- Builders & Contractors - More, Middleburg
- Building & Property Maintenance & Services, Middleburg
- Building Construction Consultants, Middleburg - Construction Management & Consulting
- Building Materials & Supplies, Middleburg
- Burglar Alarm Systems, Middleburg
- Business Brokers, Middleburg
- Business Legal Services, Middleburg
- Business Management Consultants, Middleburg
- Business Services, Middleburg
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