- Bagels, Montauk
- Bags, Montauk - Paper, Plastic, Sand, Burlap, Canvas, Transparent, etc
- Bakeries, Montauk
- Banks, Montauk
- Bars, Montauk
- Bars & Grills, Montauk
- Bathroom Remodeling, Montauk - Bathroom Remodel & Planning Services
- Bearings, Montauk
- Beauty Salons, Montauk
- Bed & Breakfast, Montauk
- Beer & Wine Stores, Montauk
- Beer Taverns, Montauk
- Beverage Stores, Montauk
- Bicycle Parts & Accessories, Montauk
- Bicycle Rentals, Montauk - Bike Rental
- Bicycle Repair & Service, Montauk - Bike Repair Shops
- Bicycle Shops, Montauk - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boarding Houses Adult Boarding Facility, Montauk
- Boat & Yacht Charter, Montauk
- Boat Fishing Charters & Tours, Montauk
- Boat Services, Montauk
- Boat Storage , Montauk - Equipment & Services
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- Boats & Yachts, Montauk - Yachts, Sailboats & Boats for Sale
- Boiler - New & Used, Montauk - Radiant Heating
- Book Stores, Montauk
- Books, Magazines & Newspapers Stores, Montauk - Bookstores
- Boutiques & Boutique Items, Montauk
- Brake Service & Repair, Montauk - Brake Pads
- Breakfast Restaurants, Montauk
- Brick Masonry & Bricklayer Contractors, Montauk - Brick Mason - Install & Repair
- Builders & Contractors, Montauk
- Builders & Contractors - More, Montauk
- Building & Property Maintenance & Services, Montauk
- Building Materials, Montauk - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Montauk
- Building Site Preparation Contractors, Montauk - Land Preparation & Land Clearing
- Burglar Alarm Systems, Montauk
- Bus Lines, Montauk - Bus Transportation
- Bus Lines Ticket Agencies, Montauk
- Business & Professional Associations, Montauk
- Business & Trade Organizations, Montauk
- Business Legal Services, Montauk
- Business Management Consultants, Montauk
- Business Services, Montauk
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