- Bakeries, Northborough
- Bank Supplies & Equipment, Northborough
- Banks, Northborough
- Banquet Halls, Northborough
- Baptist Churches, Northborough
- Barbecue Restaurants, Northborough
- Barber Shops, Northborough
- Barbers, Northborough
- Bars, Northborough
- Bars & Grills, Northborough
- Baseball & Softball Clubs, Northborough
- Bathing Accessories, Northborough
- Bathroom Remodeling, Northborough - Bathroom Remodel & Planning Services
- Bathtubs & Sinks - Repair & Refinishing, Northborough - Bathtub Refinishing, Repair & Resurfacing
- Beach & Water Related Services, Northborough
- Beauty Salons, Northborough
- Beverage Stores, Northborough
- Beverages, Northborough
- Bistros, Northborough
- Boating & Swimming Clubs, Northborough
- Bonds, Northborough
- Book Publishers, Northborough - Book Printing & Publishing
- Book Stores, Northborough
- Books, Magazines & Newspapers Stores, Northborough - Bookstores
- Boots Retail, Northborough
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- Bowling Centers, Northborough
- Brake Service & Repair, Northborough - Brake Pads
- Breakfast Restaurants, Northborough
- Brick Clay Common Face, Northborough
- Brick Masonry & Bricklayer Contractors, Northborough - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Northborough - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Northborough
- Builders & Contractors - More, Northborough
- Builders Hardware Stores, Northborough
- Building & Home Inspection, Northborough - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Northborough
- Building Construction Consultants, Northborough - Construction Management & Consulting
- Building Hardware & Materials, Northborough
- Building Materials, Northborough - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Northborough
- Building Site Preparation Contractors, Northborough - Land Preparation & Land Clearing
- Bulkhead Products, Northborough
- Business & Professional Associations, Northborough
- Business Brokers, Northborough
- Business Communication Consultants, Northborough
- Business Legal Services, Northborough
- Business Management Consultants, Northborough
- Business Services, Northborough
- Business, Vocational & Technical, Northborough
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