- Bagels, Holtsville
- Bakeries, Holtsville
- Baptist Churches, Holtsville
- Bar Code Scanning Supplies & Equipment, Holtsville
- Barbers, Holtsville
- Bars & Grills, Holtsville
- Beach & Water Related Services, Holtsville
- Beauty Salons, Holtsville
- Beer & Wine Stores, Holtsville
- Beverage Equipment, Holtsville
- Beverage Stores, Holtsville
- Boating & Swimming Clubs, Holtsville
- Book Stores, Holtsville
- Bottle Dealers, Holtsville
- Bottlers Equipment & Supplies, Holtsville
- Breakfast Restaurants, Holtsville
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- Brick Masonry & Bricklayer Contractors, Holtsville - Brick Mason - Install & Repair
- Builders & Contractors, Holtsville
- Builders & Contractors - More, Holtsville
- Building & Home Inspection, Holtsville - Real Estate, Building, Land & House Inspection Service
- Building Materials, Holtsville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Holtsville
- Burglar Alarm Systems, Holtsville
- Bus Lines, Holtsville - Bus Transportation
- Bus Lines Ticket Agencies, Holtsville
- Bus Rental & Charter Bus Service, Holtsville
- Business Development, Holtsville
- Business Legal Services, Holtsville
- Business Management Consultants, Holtsville
- Business Planning & Organizing, Holtsville
- Business Services, Holtsville
- Business Wholesale, Holtsville
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