- Baby Stores, Fitchburg - Baby Accessories & Clothes
- Bakeries, Fitchburg
- Ballroom Dance Hall, Fitchburg
- Bank Supplies & Equipment, Fitchburg
- Banks, Fitchburg
- Banners, Flags, Pennants, Decals, Posters & Signs, Fitchburg
- Banquet Halls, Fitchburg
- Banquet Halls, Reception Halls & Party Facilities, Fitchburg
- Baptist Churches, Fitchburg
- Barber Shops, Fitchburg
- Barbers, Fitchburg
- Bars, Fitchburg
- Bars & Grills, Fitchburg
- Beach & Water Related Services, Fitchburg
- Beauty Salons, Fitchburg
- Bedding & Linens Stores, Fitchburg - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Beer & Ale - Wholesale, Fitchburg
- Beer & Wine Stores, Fitchburg
- Beer Taverns, Fitchburg
- Beverage & Juice Bottlers Manufacturers, Fitchburg
- Beverage Manufacturers, Fitchburg
- Beverage Non-Alcoholic Manufacturers, Fitchburg
- Beverage Stores, Fitchburg
- Beverages, Fitchburg
- Bible Church, Fitchburg
- Bicycle Racks & Security Systems, Fitchburg
- Bicycle Shops, Fitchburg - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Biological Products & Supplies, Fitchburg
- Biological Research, Fitchburg - Biological Labs
- Biotechnology Products & Services, Fitchburg
- Blueprint Service, Fitchburg - Blueprinting Services
- Boiler Repair & Cleaning, Fitchburg
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- Bonds, Fitchburg
- Bonds Surety & Fidelity, Fitchburg
- Book Publishers, Fitchburg - Book Printing & Publishing
- Book Stores, Fitchburg
- Bookkeeping Services Licensed, Fitchburg
- Bookkeeping Systems & Services, Fitchburg
- Bottling Manufacturing, Fitchburg
- Bowling Centers, Fitchburg
- Brake Service & Repair, Fitchburg - Brake Pads
- Breakfast Restaurants, Fitchburg
- Bricks, Blocks & Stone Products, Fitchburg - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Fitchburg
- Builders & Contractors - More, Fitchburg
- Building & Home Inspection, Fitchburg - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Fitchburg - Construction Management & Consulting
- Building Design & Construction Consultants, Fitchburg
- Building Hardware & Materials, Fitchburg
- Building Materials, Fitchburg - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Fitchburg
- Burglar & Alarm Service, Fitchburg - Monitoring Service
- Burglar Alarm Systems, Fitchburg
- Business & Professional Associations, Fitchburg
- Business & Trade Organizations, Fitchburg
- Business Communication Consultants, Fitchburg
- Business Development, Fitchburg
- Business Insurance, Fitchburg
- Business Legal Services, Fitchburg
- Business Management Consultants, Fitchburg
- Business Planning & Organizing, Fitchburg
- Business Services, Fitchburg
- Business Studio Rental, Fitchburg
- Business, Vocational & Technical, Fitchburg
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