- Bakeries, Yaphank
- Banks, Yaphank
- Baptist Churches, Yaphank
- Barbers, Yaphank
- Bars, Yaphank
- Bars & Grills, Yaphank
- Baseball & Softball Clubs, Yaphank
- Batteries Dry Cell Manufacturers, Yaphank
- Batteries Dry Cell Wholesale, Yaphank
- Battery Manufacturers, Yaphank
- Battery Stores, Yaphank
- Beauty Salons, Yaphank
- Bee Control & Removal Services, Yaphank - Bee Removal Companies
- Beer Taverns, Yaphank
- Beverage Stores, Yaphank
- Biological Products & Supplies, Yaphank
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- Biological Research, Yaphank - Biological Labs
- Bird Repellent, Barrier & Control, Yaphank
- Brake Service & Repair, Yaphank - Brake Pads
- Breakfast Restaurants, Yaphank
- Builders & Contractors, Yaphank
- Builders & Contractors - More, Yaphank
- Building & Home Inspection, Yaphank - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Yaphank - Construction Management & Consulting
- Building Materials, Yaphank - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Yaphank
- Building Site Preparation Contractors, Yaphank - Land Preparation & Land Clearing
- Burglar Alarm Systems, Yaphank
- Business & Professional Associations, Yaphank
- Business Legal Services, Yaphank
- Business Services, Yaphank
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