- Bakeries, Charlestown
- Bank Supplies & Equipment, Charlestown
- Banks, Charlestown
- Barbers, Charlestown
- Barrels & Drums, Charlestown
- Barrels & Drums - New & Used, Charlestown
- Bars, Charlestown
- Bars & Grills, Charlestown
- Beauty Salons, Charlestown
- Beer Taverns, Charlestown
- Beverage Stores, Charlestown
- Bicycle Rentals, Charlestown - Bike Rental
- Bicycle Repair & Service, Charlestown - Bike Repair Shops
- Bistros, Charlestown
- Boat Services, Charlestown
- Boating & Swimming Clubs, Charlestown
- Book Binders & Folders, Charlestown - Office Supplies
- Bookkeeping Services Licensed, Charlestown
- Bookkeeping Systems & Services, Charlestown
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- Books, Magazines & Newspapers Stores, Charlestown - Bookstores
- Breakfast Restaurants, Charlestown
- Brick & Structural Product Manufacturers, Charlestown
- Builders & Contractors, Charlestown
- Builders & Contractors - More, Charlestown
- Builders Hardware Stores, Charlestown
- Building & Property Maintenance & Services, Charlestown
- Building Construction Consultants, Charlestown - Construction Management & Consulting
- Building Hardware & Materials, Charlestown
- Building Materials, Charlestown - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Charlestown
- Bus Rental & Charter Bus Service, Charlestown
- Business & Professional Associations, Charlestown
- Business & Trade Organizations, Charlestown
- Business Legal Services, Charlestown
- Business Management Consultants, Charlestown
- Business Services, Charlestown
- Business, Vocational & Technical, Charlestown
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