- Backflow Prevention Devices & Services, Fitchburg
- Bakeries, Fitchburg
- Ballroom Dance Hall, Fitchburg
- Bank Supplies & Equipment, Fitchburg
- Banks, Fitchburg
- Banquet Halls, Fitchburg
- Baptist Churches, Fitchburg
- Barber Shops, Fitchburg
- Barbers, Fitchburg
- Bars, Fitchburg
- Bars & Grills, Fitchburg
- Bathtubs & Sinks - Repair & Refinishing, Fitchburg - Bathtub Refinishing, Repair & Resurfacing
- Battery, Fitchburg - Retail Batteries Stores
- Battery Storage, Fitchburg
- Bearings, Fitchburg
- Beauty Salons, Fitchburg
- Beer & Wine Stores, Fitchburg
- Beer Taverns, Fitchburg
- Behavioral Health Doctors, Physicians & Surgeons, Fitchburg - Behavioral Medicine
- Beverage Stores, Fitchburg
- Birth Control & Family Planning Clinics, Fitchburg
- Boiler Distributors & Manufacturers, Fitchburg
- Boiler Repair & Cleaning, Fitchburg
- Bonds, Fitchburg
- Bonds Surety & Fidelity, Fitchburg
- Book Stores, Fitchburg
- Bookkeeping Services Licensed, Fitchburg
- Bookkeeping Systems & Services, Fitchburg
- Books, Magazines & Newspapers Stores, Fitchburg - Bookstores
- Bottle Dealers, Fitchburg
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- Bottlers Equipment & Supplies, Fitchburg
- Bowling Centers, Fitchburg
- Boxes Plastic & Transparent, Fitchburg
- Brake Service & Repair, Fitchburg - Brake Pads
- Breakfast Restaurants, Fitchburg
- Brick Masonry & Bricklayer Contractors, Fitchburg - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Fitchburg - Companies, Wholesale, Manufacturers & Suppliers
- Buddhist Churches, Fitchburg
- Builders & Contractors, Fitchburg
- Builders & Contractors - More, Fitchburg
- Builders Hardware Stores, Fitchburg
- Building & Home Inspection, Fitchburg - Real Estate, Building, Land & House Inspection Service
- Building Cleaning - Exterior, Fitchburg - Cleaning Service
- Building Construction Consultants, Fitchburg - Construction Management & Consulting
- Building Hardware & Materials, Fitchburg
- Building Materials, Fitchburg - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Fitchburg
- Building Restoration & Preservation, Fitchburg
- Building Site Preparation Contractors, Fitchburg - Land Preparation & Land Clearing
- Bus Rental & Charter Bus Service, Fitchburg
- Business & Professional Associations, Fitchburg
- Business Brokers, Fitchburg
- Business Forms, Systems & Supplies, Fitchburg
- Business Insurance, Fitchburg
- Business Legal Services, Fitchburg
- Business Machines Repair, Fitchburg
- Business Services, Fitchburg
- Business Wholesale, Fitchburg
- Business, Vocational & Technical, Fitchburg
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