- Bakeries, North Chelmsford
- Banks, North Chelmsford
- Banquet Halls, North Chelmsford
- Barbers, North Chelmsford
- Bars, North Chelmsford
- Bars & Grills, North Chelmsford
- Bathroom Remodeling, North Chelmsford - Bathroom Remodel & Planning Services
- Beauty Salons, North Chelmsford
- Beryllium, North Chelmsford
- Beverage Stores, North Chelmsford
- Book Manufacturers, North Chelmsford
- Bowling Centers, North Chelmsford
- Brake Lining Manufacturers, North Chelmsford
- Breakfast Restaurants, North Chelmsford
- Buddhist Churches, North Chelmsford
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- Builders & Contractors, North Chelmsford
- Builders & Contractors - More, North Chelmsford
- Builders Hardware Stores, North Chelmsford
- Building & Home Inspection, North Chelmsford - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, North Chelmsford - Construction Management & Consulting
- Building Materials & Supplies, North Chelmsford
- Bus Lines, North Chelmsford - Bus Transportation
- Bus Repair & Service, North Chelmsford
- Business & Professional Associations, North Chelmsford
- Business Cards, North Chelmsford
- Business Legal Services, North Chelmsford
- Business Machines Repair, North Chelmsford
- Business Management Consultants, North Chelmsford
- Business Services, North Chelmsford
- Business, Vocational & Technical, North Chelmsford
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