- Bags, Beltsville - Paper, Plastic, Sand, Burlap, Canvas, Transparent, etc
- Bakeries, Beltsville
- Bank Supplies & Equipment, Beltsville
- Banks, Beltsville
- Baptist Churches, Beltsville
- Barbecue Grills & Supplies, Beltsville
- Barber Shops, Beltsville
- Barbers, Beltsville
- Bars, Beltsville
- Bars & Grills, Beltsville
- Bartending Service, Beltsville
- Basement Waterproofing - Waterproofing Contractors, Beltsville - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Beltsville - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Beltsville - Bathroom Remodel & Planning Services
- Bathtubs & Sinks - Repair & Refinishing, Beltsville - Bathtub Refinishing, Repair & Resurfacing
- Beauty Salons, Beltsville
- Beer & Wine Stores, Beltsville
- Belting & Belting Supplies Wholesale, Beltsville
- Belting Supplies & Equipment, Beltsville
- Beverage Dispenser Supplies & Equipment , Beltsville - Beverage Dispensing
- Beverage Stores, Beltsville
- Biological Products & Supplies, Beltsville
- Biological Research, Beltsville - Biological Labs
- Biotechnology Products & Services, Beltsville
- Blouses, Shirts & Sweater Manufacturers, Beltsville
- Boat Services, Beltsville
- Boat Storage , Beltsville - Equipment & Services
- Boiler - New & Used, Beltsville - Radiant Heating
- Bonds Surety & Fidelity, Beltsville
- Book Stores, Beltsville
- Bookkeeping Services Licensed, Beltsville
- Bookkeeping Systems & Services, Beltsville
- Books, Magazines & Newspapers Stores, Beltsville - Bookstores
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- Brake Service & Repair, Beltsville - Brake Pads
- Brakes & Brake Parts, Beltsville - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Beltsville
- Brick & Structural Product Manufacturers, Beltsville
- Brick Masonry & Bricklayer Contractors, Beltsville - Brick Mason - Install & Repair
- Builders & Contractors, Beltsville
- Builders & Contractors - More, Beltsville
- Builders Hardware Stores, Beltsville
- Building & Property Maintenance & Services, Beltsville
- Building Construction Consultants, Beltsville - Construction Management & Consulting
- Building Design & Construction Consultants, Beltsville
- Building Hardware & Materials, Beltsville
- Building Materials, Beltsville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Beltsville
- Building Materials, Glass, Beltsville
- Building Restoration & Preservation, Beltsville
- Buildings, Beltsville
- Burglar & Alarm Service, Beltsville - Monitoring Service
- Burglar Alarm Systems, Beltsville
- Bus & Other Large Specialty Vehicle Manufacturers, Beltsville
- Bus Rental & Charter Bus Service, Beltsville
- Business & Professional Associations, Beltsville
- Business & Trade Organizations, Beltsville
- Business Brokers, Beltsville
- Business Communication Consultants, Beltsville
- Business Insurance, Beltsville
- Business Legal Services, Beltsville
- Business Machines Repair, Beltsville
- Business Management Consultants, Beltsville
- Business Parks, Beltsville
- Business Services, Beltsville
- Business Wholesale, Beltsville
- Business, Vocational & Technical, Beltsville
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