- Baby & Childrens Gifts & Accessories, Somerville
- Baby Stores, Somerville - Baby Accessories & Clothes
- Bagels, Somerville
- Baked Goods, Snacks & Sweets, Somerville
- Baker Equipment & Supplies, Somerville - Donut Maker, etc
- Bakeries, Somerville
- Bank Supplies & Equipment, Somerville
- Bankruptcy Attorneys & Lawyers, Somerville
- Bankruptcy Attorneys & Lawyers, Somerville
- Bankruptcy Lawyers & Attorneys, Somerville
- Banks, Somerville
- Banners, Flags, Pennants, Decals, Posters & Signs, Somerville
- Banquet Halls, Somerville
- Baptist Churches, Somerville
- Bar Supplies, Equipment & Fixtures, Somerville
- Barbecue Restaurants, Somerville
- Barber Shops, Somerville
- Barbers, Somerville
- Bars, Somerville
- Bars & Grills, Somerville
- Basement Waterproofing - Waterproofing Contractors, Somerville - Foundation & Concrete Waterproofing
- Battery, Somerville - Retail Batteries Stores
- Battery Storage, Somerville
- Beauty Salons, Somerville
- Bed & Breakfast, Somerville
- Bedding & Linens Stores, Somerville - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, Somerville - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Somerville - Bee Removal Companies
- Beer & Wine Stores, Somerville
- Beer Taverns, Somerville
- Beverage Alcoholic, Somerville
- Beverage Manufacturers, Somerville
- Beverage Stores, Somerville
- Beverages, Somerville
- Bicycle Rentals, Somerville - Bike Rental
- Bicycle Repair & Service, Somerville - Bike Repair Shops
- Bicycle Riding Instruction, Somerville
- Billiard Supplies & Equipment, Somerville - Pool Table
- Biological Research, Somerville - Biological Labs
- Biotechnology Products & Services, Somerville
- Bird Cages & Accessories, Somerville
- Birds, Somerville
- Birds & Bird Supplies , Somerville
- Birth Control & Family Planning Clinics, Somerville
- Bistros, Somerville
- Blacksmiths, Somerville
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- Board Games Equipment & Supplies, Somerville
- Boat Covers, Tops & Upholstery, Somerville
- Boating & Swimming Clubs, Somerville
- Boats & Yachts, Somerville - Yachts, Sailboats & Boats for Sale
- Book Binders & Folders, Somerville - Office Supplies
- Book Publishers, Somerville - Book Printing & Publishing
- Book Stores, Somerville
- Books, Magazines & Newspapers Stores, Somerville - Bookstores
- Botanical & Zoological Gardens, Somerville
- Botanical Gardens, Somerville
- Bottled & Canned Soft Drinks Manufacturers, Somerville
- Bottling Manufacturing, Somerville
- Boutiques & Boutique Items, Somerville
- Boxing Clubs & Instruction, Somerville
- Brake Lining Manufacturers, Somerville
- Brake Service & Repair, Somerville - Brake Pads
- Brazilian Restaurants, Somerville
- Breakfast Nooks & Booths, Somerville
- Breakfast Restaurants, Somerville
- Brick Masonry & Bricklayer Contractors, Somerville - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Somerville - Companies, Wholesale, Manufacturers & Suppliers
- Bridge, Tunnel & Elevated Highway Construction, Somerville - Highway, Street And Bridge Contractors
- Bridge, Tunnel & Elevated Highway Contractors, Somerville
- Builders & Contractors, Somerville
- Builders & Contractors - More, Somerville
- Builders Hardware Stores, Somerville
- Building & Property Maintenance & Services, Somerville
- Building Construction Consultants, Somerville - Construction Management & Consulting
- Building Design & Construction Consultants, Somerville
- Building Hardware & Materials, Somerville
- Building Materials, Somerville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Somerville
- Building Materials Used, Somerville
- Building Site Preparation Contractors, Somerville - Land Preparation & Land Clearing
- Bus Lines, Somerville - Bus Transportation
- Bus Lines Ticket Agencies, Somerville
- Business & Professional Associations, Somerville
- Business & Trade Organizations, Somerville
- Business Communication Consultants, Somerville
- Business Insurance, Somerville
- Business Legal Services, Somerville
- Business Management Consultants, Somerville
- Business Services, Somerville
- Business Studio Rental, Somerville
- Business, Vocational & Technical, Somerville
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