- Bakeries, Mattituck
- Banks, Mattituck
- Baptist Churches, Mattituck
- Barber Shops, Mattituck
- Bars & Grills, Mattituck
- Beauty Salons, Mattituck
- Beverage Stores, Mattituck
- Bicycle Rentals, Mattituck - Bike Rental
- Bicycle Repair & Service, Mattituck - Bike Repair Shops
- Blueprint Service, Mattituck - Blueprinting Services
- Boat Services, Mattituck
- Boating & Swimming Clubs, Mattituck
- Boats & Yachts, Mattituck - Yachts, Sailboats & Boats for Sale
- Books, Magazines & Newspapers Stores, Mattituck - Bookstores
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- Bowling Centers, Mattituck
- Brick Masonry & Bricklayer Contractors, Mattituck - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Mattituck - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Mattituck
- Builders & Contractors - More, Mattituck
- Building & Home Inspection, Mattituck - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Mattituck - Construction Management & Consulting
- Building Materials, Mattituck - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Mattituck
- Burglar Alarm Systems, Mattituck
- Business Communication Consultants, Mattituck
- Business Legal Services, Mattituck
- Business Services, Mattituck
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