- Bakeries, Williamstown
- Balloon Decorating, Williamstown
- Balloons, Williamstown
- Banking & Finance Machines, Williamstown
- Banking Attorneys & Lawyers, Williamstown
- Banking Attorneys & Lawyers, Williamstown
- Banking Lawyers & Attorneys, Williamstown
- Bankruptcy Attorneys & Lawyers, Williamstown
- Bankruptcy Attorneys & Lawyers, Williamstown
- Bankruptcy Lawyers & Attorneys, Williamstown
- Banks, Williamstown
- Banquet Halls, Williamstown
- Baptist Churches, Williamstown
- Barbecue Restaurants, Williamstown
- Barber Shops, Williamstown
- Barbers, Williamstown
- Bars, Williamstown
- Bars & Grills, Williamstown
- Baseball & Softball Instruction, Williamstown
- Basement Waterproofing - Waterproofing Contractors, Williamstown - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Williamstown - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Williamstown - Bathroom Remodel & Planning Services
- Battery, Williamstown - Retail Batteries Stores
- Battery Storage, Williamstown
- Beauty Salons, Williamstown
- Beer & Wine Stores, Williamstown
- Beer Taverns, Williamstown
- Bereavement Services, Williamstown
- Beverage Stores, Williamstown
- Bible Church, Williamstown
- Billing Services, Williamstown
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- Boats & Yachts, Williamstown - Yachts, Sailboats & Boats for Sale
- Book Stores, Williamstown
- Books, Magazines & Newspapers Stores, Williamstown - Bookstores
- Bottles & Jars Used, Williamstown
- Brake Service & Repair, Williamstown - Brake Pads
- Breakfast Restaurants, Williamstown
- Brick Masonry & Bricklayer Contractors, Williamstown - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Williamstown - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Williamstown
- Builders & Contractors - More, Williamstown
- Builders Hardware Stores, Williamstown
- Building & Home Inspection, Williamstown - Real Estate, Building, Land & House Inspection Service
- Building & Loan Associations, Williamstown
- Building & Property Maintenance & Services, Williamstown
- Building Construction Consultants, Williamstown - Construction Management & Consulting
- Building Design & Construction Consultants, Williamstown
- Building Materials, Williamstown - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Williamstown
- Building Site Preparation Contractors, Williamstown - Land Preparation & Land Clearing
- Burglar & Alarm Service, Williamstown - Monitoring Service
- Burglar Alarm Systems, Williamstown
- Burial Vaults, Williamstown
- Bus Lines, Williamstown - Bus Transportation
- Bus Lines Ticket Agencies, Williamstown
- Business & Professional Associations, Williamstown
- Business Brokers, Williamstown
- Business Insurance, Williamstown
- Business Legal Services, Williamstown
- Business Management Consultants, Williamstown
- Business Services, Williamstown
- Business, Vocational & Technical, Williamstown
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