- Baby Stores, Somerville - Baby Accessories & Clothes
- Bagel Restaurants, Somerville
- Bagels, Somerville
- Bail Bonds, Somerville
- Baker Equipment & Supplies, Somerville - Donut Maker, etc
- Bakeries, Somerville
- Baking Supplies & Needs, Somerville - Flavoring Extracts, Flour & More
- Ballroom Dance Hall, Somerville
- Bank Supplies & Equipment, Somerville
- Banking Attorneys & Lawyers, Somerville
- Banking Attorneys & Lawyers, Somerville
- Banking Lawyers & Attorneys, Somerville
- Bankruptcy Attorneys & Lawyers, Somerville
- Bankruptcy Attorneys & Lawyers, Somerville
- Bankruptcy Lawyers & Attorneys, Somerville
- Banks, Somerville
- Baptist Churches, Somerville
- Barbecue Restaurants, Somerville
- Barber Shops, Somerville
- Barbers, Somerville
- Bars, Somerville
- Bars & Grills, Somerville
- Baseball & Softball Clubs, Somerville
- Baseball Cards & Sports Memorabilia, Somerville
- Basement Waterproofing - Waterproofing Contractors, Somerville - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Somerville - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Battery, Somerville - Retail Batteries Stores
- Battery Storage, Somerville
- Beach & Water Related Services, Somerville
- Beauty Salons, Somerville
- Beer & Wine Stores, Somerville
- Beverage Stores, Somerville
- Bicycle Rentals, Somerville - Bike Rental
- Bicycle Repair & Service, Somerville - Bike Repair Shops
- Bicycle Shops, Somerville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Bicycle Tours, Somerville
- Big & Tall Men's Clothing, Somerville
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- Bird Repellent, Barrier & Control, Somerville
- Bistros, Somerville
- Blinds & Shutters, Somerville
- Blood Bank & Center, Somerville
- Boating & Swimming Clubs, Somerville
- Bonds Surety & Fidelity, Somerville
- Book Stores, Somerville
- Bookkeeping Services Licensed, Somerville
- Bookkeeping Systems & Services, Somerville
- Books, Magazines & Newspapers Stores, Somerville - Bookstores
- Boutiques & Boutique Items, Somerville
- Brake Service & Repair, Somerville - Brake Pads
- Breakfast Restaurants, Somerville
- Brick Masonry & Bricklayer Contractors, Somerville - Brick Mason - Install & Repair
- Builders & Contractors, Somerville
- Builders & Contractors - More, Somerville
- Builders Hardware Stores, Somerville
- Building & Home Inspection, Somerville - Real Estate, Building, Land & House Inspection Service
- Building & Homes Manufactures, Somerville
- Building & Land Inspection Service, Somerville
- Building & Property Maintenance & Services, Somerville
- Building Construction Consultants, Somerville - Construction Management & Consulting
- Building Design & Construction Consultants, Somerville
- Building Materials, Somerville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Somerville
- Building Site Preparation Contractors, Somerville - Land Preparation & Land Clearing
- Burglar & Alarm Service, Somerville - Monitoring Service
- Burglar Alarm Systems, Somerville
- Bus Lines, Somerville - Bus Transportation
- Bus Lines Ticket Agencies, Somerville
- Business & Professional Associations, Somerville
- Business Communication Consultants, Somerville
- Business Insurance, Somerville
- Business Legal Services, Somerville
- Business Management Consultants, Somerville
- Business Services, Somerville
- Business, Vocational & Technical, Somerville
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