- Bakeries, Clarksburg
- Banks, Clarksburg
- Barbers, Clarksburg
- Beauty Salons, Clarksburg
- Beer & Wine Stores, Clarksburg
- Beverage Stores, Clarksburg
- Book Stores, Clarksburg
- Bookkeeping Services Licensed, Clarksburg
- Bookkeeping Systems & Services, Clarksburg
- Books, Magazines & Newspapers Stores, Clarksburg - Bookstores
- Breakfast Restaurants, Clarksburg
- Builders & Contractors, Clarksburg
- Builders & Contractors - More, Clarksburg
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- Building & Property Maintenance & Services, Clarksburg
- Building Construction Consultants, Clarksburg - Construction Management & Consulting
- Building Design & Construction Consultants, Clarksburg
- Building Materials & Supplies, Clarksburg
- Burglar Alarm Systems, Clarksburg
- Business & Professional Associations, Clarksburg
- Business & Trade Organizations, Clarksburg
- Business Communication Consultants, Clarksburg
- Business Legal Services, Clarksburg
- Business Management Consultants, Clarksburg
- Business Services, Clarksburg
- Business Wholesale, Clarksburg
- Business, Vocational & Technical, Clarksburg
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