- Bagels, Potomac
- Bail Bonds, Potomac
- Bakeries, Potomac
- Bank Architects, Potomac
- Banks, Potomac
- Baptist Churches, Potomac
- Barbecue Grills & Supplies, Potomac
- Barbers, Potomac
- Bars, Potomac
- Bars & Grills, Potomac
- Baseball Cards & Sports Memorabilia, Potomac
- Basement Waterproofing - Waterproofing Contractors, Potomac - Foundation & Concrete Waterproofing
- Bathroom Remodeling, Potomac - Bathroom Remodel & Planning Services
- Beach & Water Related Services, Potomac
- Beauty Salons, Potomac
- Beer & Wine Stores, Potomac
- Beverage Dispenser Supplies & Equipment , Potomac - Beverage Dispensing
- Beverage Stores, Potomac
- Bicycle Rentals, Potomac - Bike Rental
- Bicycle Repair & Service, Potomac - Bike Repair Shops
- Bicycle Shops, Potomac - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Bill Payment Service, Potomac
- Bistros, Potomac
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- Boating & Swimming Clubs, Potomac
- Book Stores, Potomac
- Breakfast Restaurants, Potomac
- Builders & Contractors, Potomac
- Builders & Contractors - More, Potomac
- Building & Home Inspection, Potomac - Real Estate, Building, Land & House Inspection Service
- Building & Land Inspection Service, Potomac
- Building & Property Maintenance & Services, Potomac
- Building Construction Consultants, Potomac - Construction Management & Consulting
- Building Inspection Services Commercial, Potomac
- Building Materials, Potomac - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Potomac
- Building Site Preparation Contractors, Potomac - Land Preparation & Land Clearing
- Burglar & Alarm Service, Potomac - Monitoring Service
- Burglar Alarm Systems, Potomac
- Business & Professional Associations, Potomac
- Business & Trade Organizations, Potomac
- Business Brokers, Potomac
- Business Legal Services, Potomac
- Business Management Consultants, Potomac
- Business Services, Potomac
- Business, Vocational & Technical, Potomac
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