- Bakeries, Westford
- Baking Supplies & Needs, Westford - Flavoring Extracts, Flour & More
- Bank Supplies & Equipment, Westford
- Banks, Westford
- Banners, Flags, Pennants, Decals, Posters & Signs, Westford
- Barbers, Westford
- Bars, Westford
- Bars & Grills, Westford
- Bathroom Remodeling, Westford - Bathroom Remodel & Planning Services
- Battery, Westford - Retail Batteries Stores
- Battery Storage, Westford
- Beach & Water Related Services, Westford
- Beauty Salons, Westford
- Bed & Breakfast, Westford
- Bedroom Furniture Stores, Westford - Master & Kids Bedroom Furniture Sets & Beds
- Beverage Stores, Westford
- Bistros, Westford
- Boat Services, Westford
- Boating & Swimming Clubs, Westford
- Bonds, Westford
- Book Stores, Westford
- Bookkeeping Services Licensed, Westford
- Bookkeeping Systems & Services, Westford
- Books, Magazines & Newspapers Stores, Westford - Bookstores
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- Braille Services & Supplies, Westford
- Breakfast Restaurants, Westford
- Brick Clay Common Face, Westford
- Bricks, Blocks & Stone Products, Westford - Companies, Wholesale, Manufacturers & Suppliers
- British Restaurants, Westford
- Builders & Contractors, Westford
- Builders & Contractors - More, Westford
- Builders Hardware Stores, Westford
- Building & Home Inspection, Westford - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Westford
- Building Construction Consultants, Westford - Construction Management & Consulting
- Building Design & Construction Consultants, Westford
- Building Hardware & Materials, Westford
- Building Materials, Westford - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Westford
- Buildings, Westford
- Bus Rental & Charter Bus Service, Westford
- Business & Professional Associations, Westford
- Business & Trade Organizations, Westford
- Business Brokers, Westford
- Business Legal Services, Westford
- Business Management Consultants, Westford
- Business Services, Westford
- Business, Vocational & Technical, Westford
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