- Bakeries, Elmsford
- Balloons - Novelty, Toy & Decorative, Elmsford
- Bank Supplies & Equipment, Elmsford
- Banks, Elmsford
- Baptist Churches, Elmsford
- Barber Shops, Elmsford
- Barbers, Elmsford
- Bars, Elmsford
- Bars & Grills, Elmsford
- Barter & Trade Exchanges, Elmsford
- Baseball & Softball Clubs, Elmsford
- Bathroom Remodeling, Elmsford - Bathroom Remodel & Planning Services
- Beauty Salons, Elmsford
- Bed & Breakfast, Elmsford
- Beer & Ale - Wholesale, Elmsford
- Beer & Wine Stores, Elmsford
- Beverage & Juice Bottlers Manufacturers, Elmsford
- Beverage Non-Alcoholic Manufacturers, Elmsford
- Beverage Stores, Elmsford
- Beverages, Elmsford
- Bibles Retail, Elmsford
- Bicycle Rentals, Elmsford - Bike Rental
- Bicycle Repair & Service, Elmsford - Bike Repair Shops
- Blood Bank & Center, Elmsford
- Blueprint Service, Elmsford - Blueprinting Services
- Board Of Education, Elmsford
- Boiler Supplies & Equipment, Elmsford - Water Heaters & Boilers
- Bookkeeping Services Licensed, Elmsford
- Bookkeeping Systems & Services, Elmsford
- Books, Magazines & Newspapers Stores, Elmsford - Bookstores
- Bottling Manufacturing, Elmsford
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- Boutiques & Boutique Items, Elmsford
- Brake Service & Repair, Elmsford - Brake Pads
- Breakfast Restaurants, Elmsford
- Brick Masonry & Bricklayer Contractors, Elmsford - Brick Mason - Install & Repair
- Bridge & Poker Instruction, Elmsford
- Builders & Contractors, Elmsford
- Builders & Contractors - More, Elmsford
- Builders Hardware Stores, Elmsford
- Building & Property Maintenance & Services, Elmsford
- Building Construction Consultants, Elmsford - Construction Management & Consulting
- Building Design & Construction Consultants, Elmsford
- Building Hardware & Materials, Elmsford
- Building Materials, Elmsford - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Elmsford
- Burglar & Alarm Service, Elmsford - Monitoring Service
- Burglar & Alarm Systems Manufacturers, Elmsford
- Burglar Alarm Systems, Elmsford
- Bus Rental & Charter Bus Service, Elmsford
- Business & Professional Associations, Elmsford
- Business & Trade Organizations, Elmsford
- Business Brokers, Elmsford
- Business Communication Consultants, Elmsford
- Business Forms, Systems & Supplies, Elmsford
- Business Insurance, Elmsford
- Business Legal Services, Elmsford
- Business Management Consultants, Elmsford
- Business Services, Elmsford
- Business Studio Rental, Elmsford
- Business, Vocational & Technical, Elmsford
- Buyers Services, Elmsford
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