- Bail Bonds, West Sayville
- Banks, West Sayville
- Barber Shops, West Sayville
- Barbers, West Sayville
- Bars & Grills, West Sayville
- Beauty Salons, West Sayville
- Beverage Stores, West Sayville
- Bicycle Parts & Accessories, West Sayville
- Bicycle Racks & Security Systems, West Sayville
- Bicycle Rentals, West Sayville - Bike Rental
- Bicycle Repair & Service, West Sayville - Bike Repair Shops
- Bicycle Shops, West Sayville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat & Yacht Brokers, West Sayville
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- Boat Services, West Sayville
- Boat Storage , West Sayville - Equipment & Services
- Boats & Yachts, West Sayville - Yachts, Sailboats & Boats for Sale
- Boiler Repair & Cleaning, West Sayville
- Brick Masonry & Bricklayer Contractors, West Sayville - Brick Mason - Install & Repair
- Builders & Contractors, West Sayville
- Builders & Contractors - More, West Sayville
- Building Construction Consultants, West Sayville - Construction Management & Consulting
- Burglar Alarm Systems, West Sayville
- Business Brokers, West Sayville
- Business Insurance, West Sayville
- Business Legal Services, West Sayville
- Business Services, West Sayville
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