- Baby Stores, Westborough - Baby Accessories & Clothes
- Bagel Restaurants, Westborough
- Bagels, Westborough
- Bakeries, Westborough
- Balloons - Novelty, Toy & Decorative, Westborough
- Bank Auditing & Consulting, Westborough
- Bank Supplies & Equipment, Westborough
- Banking Attorneys & Lawyers, Westborough
- Banking Attorneys & Lawyers, Westborough
- Banking Lawyers & Attorneys, Westborough
- Banks, Westborough
- Barber Shop & Beauty Salon Supplies & Equipment, Westborough - Beauty & Barber Supplies
- Barbers, Westborough
- Bars, Westborough
- Bars & Grills, Westborough
- Bathroom Remodeling, Westborough - Bathroom Remodel & Planning Services
- Bathtubs & Sinks - Repair & Refinishing, Westborough - Bathtub Refinishing, Repair & Resurfacing
- Battery, Westborough - Retail Batteries Stores
- Battery Supplies, Westborough
- Beach & Water Related Services, Westborough
- Beauty Salons, Westborough
- Bedroom Furniture Stores, Westborough - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Westborough
- Beer Taverns, Westborough
- Beverage & Juice Bottlers Manufacturers, Westborough
- Beverage Non-Alcoholic Manufacturers, Westborough
- Beverage Stores, Westborough
- Beverages, Westborough
- Bicycle Parts & Accessories, Westborough
- Bicycle Rentals, Westborough - Bike Rental
- Bicycle Repair & Service, Westborough - Bike Repair Shops
- Bicycle Shops, Westborough - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
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- Billing Services, Westborough
- Bistros, Westborough
- Boiler Compounds, Westborough
- Boiler Rental, Westborough
- Book Stores, Westborough
- Books, Magazines & Newspapers Stores, Westborough - Bookstores
- Bottling Manufacturing, Westborough
- Boutiques & Boutique Items, Westborough
- Brake Service & Repair, Westborough - Brake Pads
- Breakfast Restaurants, Westborough
- Brick & Structural Product Manufacturers, Westborough
- Brick Masonry & Bricklayer Contractors, Westborough - Brick Mason - Install & Repair
- Builders & Contractors, Westborough
- Builders & Contractors - More, Westborough
- Builders Hardware Stores, Westborough
- Building & Property Maintenance & Services, Westborough
- Building Construction Consultants, Westborough - Construction Management & Consulting
- Building Hardware & Materials, Westborough
- Building Materials, Westborough - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Westborough
- Burglar & Alarm Service, Westborough - Monitoring Service
- Burglar Alarm Systems, Westborough
- Bus Rental & Charter Bus Service, Westborough
- Business & Professional Associations, Westborough
- Business & Trade Organizations, Westborough
- Business Brokers, Westborough
- Business Communication Consultants, Westborough
- Business Legal Services, Westborough
- Business Management Consultants, Westborough
- Business Services, Westborough
- Business, Vocational & Technical, Westborough
- Butchers & Meat Markets - Manufacturers, Westborough
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