- Bakeries, Peterborough
- Balloons, Peterborough
- Balloons - Novelty, Toy & Decorative, Peterborough
- Banks, Peterborough
- Barbers, Peterborough
- Bars, Peterborough
- Bars & Grills, Peterborough
- Baskets Wholesale & Manufacturers, Peterborough
- Bearings, Peterborough
- Beauty Salons, Peterborough
- Bed & Breakfast, Peterborough
- Beer Taverns, Peterborough
- Beverage Stores, Peterborough
- Billing Services, Peterborough
- Bonds, Peterborough
- Book Publishers, Peterborough - Book Printing & Publishing
- Book Stores, Peterborough
- Bookkeeping Services Licensed, Peterborough
- Bookkeeping Systems & Services, Peterborough
- Books, Magazines & Newspapers Stores, Peterborough - Bookstores
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- Boxes Specialty & Fancy, Peterborough
- Breakfast Restaurants, Peterborough
- Bricks, Blocks & Stone Products, Peterborough - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Peterborough
- Builders & Contractors - More, Peterborough
- Builders Hardware Stores, Peterborough
- Building & Home Inspection, Peterborough - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Peterborough - Construction Management & Consulting
- Building Design & Construction Consultants, Peterborough
- Building Hardware & Materials, Peterborough
- Building Materials, Peterborough - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Peterborough
- Burglar Alarm Systems, Peterborough
- Bus Lines, Peterborough - Bus Transportation
- Business & Professional Associations, Peterborough
- Business & Trade Organizations, Peterborough
- Business Legal Services, Peterborough
- Business Management Consultants, Peterborough
- Business Services, Peterborough
- Business, Vocational & Technical, Peterborough
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