- Bagel Restaurants, Chelmsford
- Bagels, Chelmsford
- Bakeries, Chelmsford
- Balloons - Novelty, Toy & Decorative, Chelmsford
- Bank Supplies & Equipment, Chelmsford
- Banking Attorneys & Lawyers, Chelmsford
- Banking Attorneys & Lawyers, Chelmsford
- Banking Lawyers & Attorneys, Chelmsford
- Bankruptcy Attorneys & Lawyers, Chelmsford
- Bankruptcy Attorneys & Lawyers, Chelmsford
- Bankruptcy Lawyers & Attorneys, Chelmsford
- Banks, Chelmsford
- Baptist Churches, Chelmsford
- Barbers, Chelmsford
- Bars & Grills, Chelmsford
- Barter & Trade Exchanges, Chelmsford
- Baseball & Softball Clubs, Chelmsford
- Bathroom Fixtures, Chelmsford - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Chelmsford - Bathroom Remodel & Planning Services
- Beauty Salons, Chelmsford
- Bedding & Mattress Manufacturers Supplies, Chelmsford
- Bedding Manufacturers Supplies, Chelmsford
- Bedroom Furniture Stores, Chelmsford - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Chelmsford
- Bereavement Services, Chelmsford
- Beverage Stores, Chelmsford
- Beverages, Chelmsford
- Bible Church, Chelmsford
- Bicycle Parts & Accessories, Chelmsford
- Bicycle Rentals, Chelmsford - Bike Rental
- Bicycle Repair & Service, Chelmsford - Bike Repair Shops
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- Bicycle Shops, Chelmsford - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Chelmsford
- Boat Services, Chelmsford
- Boiler Repair & Cleaning, Chelmsford
- Bonds, Chelmsford
- Book Stores, Chelmsford
- Bookkeeping Services Licensed, Chelmsford
- Bookkeeping Systems & Services, Chelmsford
- Books, Magazines & Newspapers Stores, Chelmsford - Bookstores
- Boutiques & Boutique Items, Chelmsford
- Breakfast Restaurants, Chelmsford
- Brick Masonry & Bricklayer Contractors, Chelmsford - Brick Mason - Install & Repair
- Builders & Contractors, Chelmsford
- Builders & Contractors - More, Chelmsford
- Builders Hardware Stores, Chelmsford
- Building & Property Maintenance & Services, Chelmsford
- Building Construction Consultants, Chelmsford - Construction Management & Consulting
- Building Hardware & Materials, Chelmsford
- Building Materials, Chelmsford - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Chelmsford
- Burial Vaults, Chelmsford
- Business & Professional Associations, Chelmsford
- Business & Trade Organizations, Chelmsford
- Business Communication Consultants, Chelmsford
- Business Insurance, Chelmsford
- Business Legal Services, Chelmsford
- Business Management Consultants, Chelmsford
- Business Services, Chelmsford
- Business Wholesale, Chelmsford
- Business, Vocational & Technical, Chelmsford
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