- Bagels, Plainsboro
- Bakeries, Plainsboro
- Banks, Plainsboro
- Banquet Halls, Plainsboro
- Barbers, Plainsboro
- Bars & Grills, Plainsboro
- Beauty Salons, Plainsboro
- Beer & Wine Stores, Plainsboro
- Behavioral Health Doctors, Physicians & Surgeons, Plainsboro - Behavioral Medicine
- Beverage Stores, Plainsboro
- Bonds, Plainsboro
- Bookkeeping Services Licensed, Plainsboro
- Bookkeeping Systems & Services, Plainsboro
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- Breakfast Restaurants, Plainsboro
- Builders & Contractors, Plainsboro
- Building & Property Maintenance & Services, Plainsboro
- Building Construction Consultants, Plainsboro - Construction Management & Consulting
- Building Materials, Plainsboro - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Plainsboro
- Burglar Alarm Systems, Plainsboro
- Business & Professional Associations, Plainsboro
- Business & Trade Organizations, Plainsboro
- Business Legal Services, Plainsboro
- Business Management Consultants, Plainsboro
- Business Services, Plainsboro
- Business, Vocational & Technical, Plainsboro
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