- Baby & Childrens Gifts & Accessories, Reston
- Baby Stores, Reston - Baby Accessories & Clothes
- Bagels, Reston
- Bakeries, Reston
- Banks, Reston
- Banquet Halls, Reston
- Baptist Churches, Reston
- Barbers, Reston
- Bars, Reston
- Bars & Grills, Reston
- Basketball Clubs & Instruction, Reston
- Bathroom Remodeling, Reston - Bathroom Remodel & Planning Services
- Beach & Water Related Services, Reston
- Beauty Salons, Reston
- Bedroom Furniture Stores, Reston - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Reston
- Beer Taverns, Reston
- Beverage Dispenser Supplies & Equipment , Reston - Beverage Dispensing
- Beverage Stores, Reston
- Bicycle Equipment & Clothing, Reston
- Bicycle Parts & Accessories, Reston
- Bicycle Shops, Reston - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Binoculars & Telescopes, Reston
- Biological Products & Supplies, Reston
- Biological Research, Reston - Biological Labs
- Bird Feeders & Supplies, Reston
- Boat Services, Reston
- Boat Storage , Reston - Equipment & Services
- Boating & Swimming Clubs, Reston
- Bonds, Reston
- Book Stores, Reston
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- Bookkeeping Services Licensed, Reston
- Bookkeeping Systems & Services, Reston
- Books, Magazines & Newspapers Stores, Reston - Bookstores
- Boutiques & Boutique Items, Reston
- Box Lunches, Reston
- Brake Service & Repair, Reston - Brake Pads
- Brakes & Brake Parts, Reston - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Reston
- Brew Pubs, Reston
- Buddhist Churches, Reston
- Builders & Contractors, Reston
- Builders & Contractors - More, Reston
- Builders Hardware Stores, Reston
- Building & Home Inspection, Reston - Real Estate, Building, Land & House Inspection Service
- Building & House Movers & Raising Contractors, Reston
- Building & Property Maintenance & Services, Reston
- Building Construction Consultants, Reston - Construction Management & Consulting
- Building Design & Construction Consultants, Reston
- Building Materials, Reston - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Reston
- Burglar Alarm Systems, Reston
- Business & Professional Associations, Reston
- Business & Trade Organizations, Reston
- Business Brokers, Reston
- Business Communication Consultants, Reston
- Business Insurance, Reston
- Business Legal Services, Reston
- Business Management Consultants, Reston
- Business Services, Reston
- Business, Vocational & Technical, Reston
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