- Bagels, Northampton
- Bakeries, Northampton
- Bank Supplies & Equipment, Northampton
- Bankruptcy Attorneys & Lawyers, Northampton
- Bankruptcy Attorneys & Lawyers, Northampton
- Bankruptcy Lawyers & Attorneys, Northampton
- Banks, Northampton
- Banners, Flags, Pennants, Decals, Posters & Signs, Northampton
- Banquet Halls, Northampton
- Barber Shops, Northampton
- Barbers, Northampton
- Bars & Grills, Northampton
- Bathing Accessories, Northampton
- Battery, Northampton - Retail Batteries Stores
- Battery Storage, Northampton
- Beauty Salons, Northampton
- Bedroom Furniture Stores, Northampton - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Northampton - Bee Removal Companies
- Beer & Wine Stores, Northampton
- Beer Brewing Supplies & Equipment, Northampton
- Beverage Stores, Northampton
- Bicycle Rentals, Northampton - Bike Rental
- Bicycle Repair & Service, Northampton - Bike Repair Shops
- Bird Feeders & Supplies, Northampton
- Bird Repellent, Barrier & Control, Northampton
- Birth Control & Family Planning Clinics, Northampton
- Bistros, Northampton
- Blood Bank & Center, Northampton
- Bonds Surety & Fidelity, Northampton
- Book Binders & Folders, Northampton - Office Supplies
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- Book Publishers, Northampton - Book Printing & Publishing
- Book Stores, Northampton
- Bookkeeping Services Licensed, Northampton
- Bookkeeping Systems & Services, Northampton
- Books, Magazines & Newspapers Stores, Northampton - Bookstores
- Bottled Gas, Lp Gas & Propane Dealers, Northampton
- Bowling Centers, Northampton
- Boxing Clubs & Instruction, Northampton
- Brake Service & Repair, Northampton - Brake Pads
- Breakfast Restaurants, Northampton
- Bricks, Blocks & Stone Products, Northampton - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Northampton
- Builders & Contractors - More, Northampton
- Builders Hardware Stores, Northampton
- Building & Home Inspection, Northampton - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Northampton
- Building Construction Consultants, Northampton - Construction Management & Consulting
- Building Design & Construction Consultants, Northampton
- Building Hardware & Materials, Northampton
- Building Materials, Northampton - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Northampton
- Business & Professional Associations, Northampton
- Business Communication Consultants, Northampton
- Business Development, Northampton
- Business Legal Services, Northampton
- Business Management Consultants, Northampton
- Business Planning & Organizing, Northampton
- Business Services, Northampton
- Business, Vocational & Technical, Northampton
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