- Baked Goods, Snacks & Sweets, Billerica
- Bakeries, Billerica
- Bank Supplies & Equipment, Billerica
- Banks, Billerica
- Banquet Halls, Billerica
- Baptist Churches, Billerica
- Barbers, Billerica
- Bars, Billerica
- Bars & Grills, Billerica
- Baseball Cards & Sports Memorabilia, Billerica
- Battery, Billerica - Retail Batteries Stores
- Battery Storage, Billerica
- Beauty Salons, Billerica
- Bee Control & Removal Services, Billerica - Bee Removal Companies
- Beef Restaurants, Billerica
- Beer & Wine Stores, Billerica
- Benches & Work Tables, Billerica
- Beverage Stores, Billerica
- Biological Products & Supplies, Billerica
- Biological Research, Billerica - Biological Labs
- Brake Service & Repair, Billerica - Brake Pads
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- Breakfast Restaurants, Billerica
- Brick Masonry & Bricklayer Contractors, Billerica - Brick Mason - Install & Repair
- Buffet Restaurants, Billerica
- Builders & Contractors, Billerica
- Builders & Contractors - More, Billerica
- Building & Property Maintenance & Services, Billerica
- Building Construction Consultants, Billerica - Construction Management & Consulting
- Building Design & Construction Consultants, Billerica
- Building Hardware & Materials, Billerica
- Building Materials, Billerica - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Billerica
- Building Materials, Glass, Billerica
- Burglar Alarm Systems, Billerica
- Bus Rental & Charter Bus Service, Billerica
- Business Forms, Systems & Supplies, Billerica
- Business Legal Services, Billerica
- Business Management Consultants, Billerica
- Business Services, Billerica
- Business Studio Rental, Billerica
- Business, Vocational & Technical, Billerica
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