- Bakeries, Groton
- Banks, Groton
- Baptist Churches, Groton
- Barbers, Groton
- Bars, Groton
- Bars & Grills, Groton
- Batteries Dry Cell Manufacturers, Groton
- Batteries Dry Cell Wholesale, Groton
- Battery Manufacturers, Groton
- Battery Stores, Groton
- Beauty Salons, Groton
- Beer Taverns, Groton
- Beverage Stores, Groton
- Bonds, Groton
- Breakfast Restaurants, Groton
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- Brick Masonry & Bricklayer Contractors, Groton - Brick Mason - Install & Repair
- Builders & Contractors, Groton
- Builders & Contractors - More, Groton
- Builders Hardware Stores, Groton
- Building Construction Consultants, Groton - Construction Management & Consulting
- Building Materials, Groton - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Groton
- Burglar & Alarm Service, Groton - Monitoring Service
- Burglar Alarm Systems, Groton
- Bus Rental & Charter Bus Service, Groton
- Business Forms, Systems & Supplies, Groton
- Business Legal Services, Groton
- Business Management Consultants, Groton
- Business Services, Groton
- Business, Vocational & Technical, Groton
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