- Baby Stores, Gaithersburg - Baby Accessories & Clothes
- Backhoe & Bulldozer Contractors, Gaithersburg - Backhoe & Dozer Services
- Bagel Restaurants, Gaithersburg
- Bagels, Gaithersburg
- Bakeries, Gaithersburg
- Baking Supplies & Needs, Gaithersburg - Flavoring Extracts, Flour & More
- Ballroom Dance Hall, Gaithersburg
- Bank Supplies & Equipment, Gaithersburg
- Bankruptcy Attorneys & Lawyers, Gaithersburg
- Bankruptcy Attorneys & Lawyers, Gaithersburg
- Bankruptcy Lawyers & Attorneys, Gaithersburg
- Banks, Gaithersburg
- Banquet Halls, Gaithersburg
- Baptist Churches, Gaithersburg
- Bar Code Scanning Supplies & Equipment, Gaithersburg
- Barbecue Grills & Supplies, Gaithersburg
- Barbecue Restaurants, Gaithersburg
- Barber Shops, Gaithersburg
- Barbers, Gaithersburg
- Bars, Gaithersburg
- Bars & Grills, Gaithersburg
- Basketball Clubs & Instruction, Gaithersburg
- Bath Equipment & Supplies, Gaithersburg
- Bath Houses, Gaithersburg
- Bathroom Fixtures, Gaithersburg - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Gaithersburg - Bathroom Remodel & Planning Services
- Batteries Dry Cell Manufacturers, Gaithersburg
- Batteries Dry Cell Wholesale, Gaithersburg
- Batteries Storage Manufacturers, Gaithersburg
- Battery, Gaithersburg - Retail Batteries Stores
- Battery Manufacturers, Gaithersburg
- Battery Storage, Gaithersburg
- Battery Stores, Gaithersburg
- Beach & Water Related Services, Gaithersburg
- Beads Decor, Gaithersburg
- Bearings, Gaithersburg
- Beauty Salons, Gaithersburg
- Bedroom Furniture Stores, Gaithersburg - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Ale - Wholesale, Gaithersburg
- Beer & Wine Stores, Gaithersburg
- Beer Taverns, Gaithersburg
- Beverage Alcoholic, Gaithersburg
- Beverage Manufacturers, Gaithersburg
- Beverage Stores, Gaithersburg
- Beverages, Gaithersburg
- Bible Church, Gaithersburg
- Bicycle Equipment & Clothing, Gaithersburg
- Bicycle Parts & Accessories, Gaithersburg
- Bicycle Rentals, Gaithersburg - Bike Rental
- Bicycle Repair & Service, Gaithersburg - Bike Repair Shops
- Bicycle Shops, Gaithersburg - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Gaithersburg
- Bio Hazardous Material - Handling & Disposal, Gaithersburg
- Biological Products & Supplies, Gaithersburg
- Biological Research, Gaithersburg - Biological Labs
- Biotechnology Products & Services, Gaithersburg
- Bird Feeders & Supplies, Gaithersburg
- Bird Repellent, Barrier & Control, Gaithersburg
- Birth Control & Family Planning Clinics, Gaithersburg
- Bistros, Gaithersburg
- Blouses, Shirts & Sweater Manufacturers, Gaithersburg
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- Blue Printing Dispensing Supplies & Equipment, Gaithersburg
- Blueprint Service, Gaithersburg - Blueprinting Services
- Boat Services, Gaithersburg
- Boat Storage , Gaithersburg - Equipment & Services
- Boating & Swimming Clubs, Gaithersburg
- Boiler & Furnace Contractors, Gaithersburg - Installation, Cleaning & Repair Services
- Boiler Repair & Cleaning, Gaithersburg
- Bonds, Gaithersburg
- Bonds Surety & Fidelity, Gaithersburg
- Book Binders & Folders, Gaithersburg - Office Supplies
- Book Publishers, Gaithersburg - Book Printing & Publishing
- Book Stores, Gaithersburg
- Bookkeeping Services Licensed, Gaithersburg
- Bookkeeping Systems & Services, Gaithersburg
- Books, Magazines & Newspapers Stores, Gaithersburg - Bookstores
- Botanical & Zoological Gardens, Gaithersburg
- Botanical Gardens, Gaithersburg
- Bottling Manufacturing, Gaithersburg
- Boutiques & Boutique Items, Gaithersburg
- Bowling Centers, Gaithersburg
- Box Lunches, Gaithersburg
- Boxing Clubs & Instruction, Gaithersburg
- Brake Service & Repair, Gaithersburg - Brake Pads
- Brakes & Brake Parts, Gaithersburg - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Gaithersburg
- Brethren Church, Gaithersburg
- Brick Clay Common Face, Gaithersburg
- Brick Masonry & Bricklayer Contractors, Gaithersburg - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Gaithersburg - Companies, Wholesale, Manufacturers & Suppliers
- Brooms & Brushes, Gaithersburg
- Brooms & Brushes Manufacturers, Gaithersburg
- Buddhist Churches, Gaithersburg
- Buffet Restaurants, Gaithersburg
- Builders & Contractors, Gaithersburg
- Builders & Contractors - More, Gaithersburg
- Builders Hardware Stores, Gaithersburg
- Building & Home Inspection, Gaithersburg - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Gaithersburg
- Building Construction Consultants, Gaithersburg - Construction Management & Consulting
- Building Design & Construction Consultants, Gaithersburg
- Building Hardware & Materials, Gaithersburg
- Building Materials, Gaithersburg - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Gaithersburg
- Building Restoration & Preservation, Gaithersburg
- Burglar & Alarm Service, Gaithersburg - Monitoring Service
- Burglar Alarm Systems, Gaithersburg
- Bus Lines, Gaithersburg - Bus Transportation
- Bus Lines Ticket Agencies, Gaithersburg
- Bus Rental & Charter Bus Service, Gaithersburg
- Business & Professional Associations, Gaithersburg
- Business & Trade Organizations, Gaithersburg
- Business Brokers, Gaithersburg
- Business Communication Consultants, Gaithersburg
- Business Forms, Systems & Supplies, Gaithersburg
- Business Insurance, Gaithersburg
- Business Legal Services, Gaithersburg
- Business Management Consultants, Gaithersburg
- Business Services, Gaithersburg
- Business Wholesale, Gaithersburg
- Business, Vocational & Technical, Gaithersburg
- Butchers & Meat Markets - Manufacturers, Gaithersburg
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