- Back Care Products, Southborough
- Bakeries, Southborough
- Bank Supplies & Equipment, Southborough
- Banks, Southborough
- Barbecue Restaurants, Southborough
- Barbers, Southborough
- Baseball & Softball Clubs, Southborough
- Beauty Salons, Southborough
- Beverage Stores, Southborough
- Beverages, Southborough
- Boat Covers, Tops & Upholstery, Southborough
- Boats & Yachts, Southborough - Yachts, Sailboats & Boats for Sale
- Books, Magazines & Newspapers Stores, Southborough - Bookstores
- Breakfast Restaurants, Southborough
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- Builders & Contractors, Southborough
- Builders & Contractors - More, Southborough
- Building & Property Maintenance & Services, Southborough
- Building Construction Consultants, Southborough - Construction Management & Consulting
- Building Hardware & Materials, Southborough
- Building Materials, Southborough - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Southborough
- Business & Professional Associations, Southborough
- Business Legal Services, Southborough
- Business Management Consultants, Southborough
- Business Services, Southborough
- Business, Vocational & Technical, Southborough
- Butchers & Meat Markets - Manufacturers, Southborough
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