- Bail Bonds, Waltham
- Bakeries, Waltham
- Balancing Service, Waltham - Wheel & Tire Balancing
- Balancing Service Industrial, Waltham
- Balloons - Novelty, Toy & Decorative, Waltham
- Bank Supplies & Equipment, Waltham
- Bankruptcy Attorneys & Lawyers, Waltham
- Bankruptcy Attorneys & Lawyers, Waltham
- Bankruptcy Lawyers & Attorneys, Waltham
- Banks, Waltham
- Banners, Flags, Pennants, Decals, Posters & Signs, Waltham
- Baptist Churches, Waltham
- Barber Shops, Waltham
- Barbers, Waltham
- Bars, Waltham
- Bars & Grills, Waltham
- Baseball & Softball Clubs, Waltham
- Baseball Cards & Sports Memorabilia, Waltham
- Basement Waterproofing - Waterproofing Contractors, Waltham - Foundation & Concrete Waterproofing
- Basketball Clubs & Instruction, Waltham
- Bathroom Fixtures, Waltham - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Battery, Waltham - Retail Batteries Stores
- Battery Storage, Waltham
- Bearings, Waltham
- Beauty Salons, Waltham
- Bed & Breakfast, Waltham
- Bedding & Linens Stores, Waltham - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, Waltham - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Waltham
- Beer Taverns, Waltham
- Beverage & Juice Bottlers Manufacturers, Waltham
- Beverage Non-Alcoholic Manufacturers, Waltham
- Beverage Stores, Waltham
- Bicycle Parts & Accessories, Waltham
- Bicycle Rentals, Waltham - Bike Rental
- Bicycle Repair & Service, Waltham - Bike Repair Shops
- Bicycle Shops, Waltham - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billiard & Pool Parlors, Waltham
- Billiard Supplies & Equipment, Waltham - Pool Table
- Billing Services, Waltham
- Biological Products & Supplies, Waltham
- Biological Research, Waltham - Biological Labs
- Biotechnology Products & Services, Waltham
- Bird Repellent, Barrier & Control, Waltham
- Blasting Contractors Supplies & Equipment, Waltham
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- Boat Covers, Tops & Upholstery, Waltham
- Boat Services, Waltham
- Boats & Yachts, Waltham - Yachts, Sailboats & Boats for Sale
- Book Binders & Folders, Waltham - Office Supplies
- Book Stores, Waltham
- Bookkeeping Services Licensed, Waltham
- Bookkeeping Systems & Services, Waltham
- Books, Magazines & Newspapers Stores, Waltham - Bookstores
- Bottling Manufacturing, Waltham
- Boutiques & Boutique Items, Waltham
- Brake Service & Repair, Waltham - Brake Pads
- Breakfast Restaurants, Waltham
- Brick & Structural Product Manufacturers, Waltham
- Brick Masonry & Bricklayer Contractors, Waltham - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Waltham - Companies, Wholesale, Manufacturers & Suppliers
- Bridge, Tunnel & Elevated Highway Contractors, Waltham
- Builders & Contractors, Waltham
- Builders & Contractors - More, Waltham
- Builders Hardware Stores, Waltham
- Building & Home Inspection, Waltham - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Waltham
- Building Construction Consultants, Waltham - Construction Management & Consulting
- Building Hardware & Materials, Waltham
- Building Materials, Waltham - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Waltham
- Building Materials, Glass, Waltham
- Building Site Preparation Contractors, Waltham - Land Preparation & Land Clearing
- Buildings, Waltham
- Burglar Alarm Systems, Waltham
- Bus Lines, Waltham - Bus Transportation
- Bus Lines Ticket Agencies, Waltham
- Business & Professional Associations, Waltham
- Business & Trade Organizations, Waltham
- Business Brokers, Waltham
- Business Communication Consultants, Waltham
- Business Development, Waltham
- Business Insurance, Waltham
- Business Legal Services, Waltham
- Business Management Consultants, Waltham
- Business Planning & Consulting, Waltham
- Business Planning & Organizing, Waltham
- Business Services, Waltham
- Business Wholesale, Waltham
- Business, Vocational & Technical, Waltham
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