- Bagel Restaurants, Middle Island
- Bagels, Middle Island
- Bakeries, Middle Island
- Banks, Middle Island
- Baptist Churches, Middle Island
- Barber Shops, Middle Island
- Barbers, Middle Island
- Baseball & Softball Batting Ranges, Middle Island
- Bathroom Remodeling, Middle Island - Bathroom Remodel & Planning Services
- Beauty Salons, Middle Island
- Beer & Wine Stores, Middle Island
- Bicycle Rentals, Middle Island - Bike Rental
- Bicycle Repair & Service, Middle Island - Bike Repair Shops
- Board Of Education, Middle Island
- Boiler Repair & Cleaning, Middle Island
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- Brake Service & Repair, Middle Island - Brake Pads
- Breakfast Restaurants, Middle Island
- Builders & Contractors, Middle Island
- Builders & Contractors - More, Middle Island
- Building Construction Consultants, Middle Island - Construction Management & Consulting
- Building Hardware & Materials, Middle Island
- Building Materials, Middle Island - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Middle Island
- Building Site Preparation Contractors, Middle Island - Land Preparation & Land Clearing
- Burglar Alarm Systems, Middle Island
- Bus Rental & Charter Bus Service, Middle Island
- Business Insurance, Middle Island
- Business Legal Services, Middle Island
- Business Services, Middle Island
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