- Bakeries, Katonah
- Banks, Katonah
- Barbecue Grills & Supplies, Katonah
- Barbers, Katonah
- Bars, Katonah
- Bathroom Remodeling, Katonah - Bathroom Remodel & Planning Services
- Beach & Water Related Services, Katonah
- Beads Decor, Katonah
- Beauty Salons, Katonah
- Beer Taverns, Katonah
- Beverage & Juice Bottlers Manufacturers, Katonah
- Beverage Non-Alcoholic Manufacturers, Katonah
- Beverage Stores, Katonah
- Bistros, Katonah
- Bonds, Katonah
- Bottling Manufacturing, Katonah
- Boutiques & Boutique Items, Katonah
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- Brick Masonry & Bricklayer Contractors, Katonah - Brick Mason - Install & Repair
- Builders & Contractors, Katonah
- Builders & Contractors - More, Katonah
- Building & Home Inspection, Katonah - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Katonah
- Building Construction Consultants, Katonah - Construction Management & Consulting
- Building Materials, Katonah - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Katonah
- Burglar & Alarm Service, Katonah - Monitoring Service
- Burglar Alarm Systems, Katonah
- Business & Professional Associations, Katonah
- Business Insurance, Katonah
- Business Legal Services, Katonah
- Business Management Consultants, Katonah
- Business Services, Katonah
- Business, Vocational & Technical, Katonah
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