- Baby Stores, Frederick - Baby Accessories & Clothes
- Bagel Restaurants, Frederick
- Bagels, Frederick
- Bail Bonds, Frederick
- Bakeries, Frederick
- Baking Supplies & Needs, Frederick - Flavoring Extracts, Flour & More
- Balloons, Frederick
- Balloons - Novelty, Toy & Decorative, Frederick
- Bank Supplies & Equipment, Frederick
- Banking Attorneys & Lawyers, Frederick
- Banking Attorneys & Lawyers, Frederick
- Banking Lawyers & Attorneys, Frederick
- Bankruptcy Attorneys & Lawyers, Frederick
- Bankruptcy Attorneys & Lawyers, Frederick
- Bankruptcy Lawyers & Attorneys, Frederick
- Bankruptcy Services, Frederick
- Banks, Frederick
- Banners, Flags, Pennants, Decals, Posters & Signs, Frederick
- Banners, Pennants & Flags, Frederick
- Banquet Halls, Frederick
- Banquet Halls, Reception Halls & Party Facilities, Frederick
- Baptist Churches, Frederick
- Barbecue Grills & Supplies, Frederick
- Barbecue Restaurants, Frederick
- Barber Shops, Frederick
- Barbers, Frederick
- Barrels & Drums, Frederick
- Bars, Frederick
- Bars & Grills, Frederick
- Baseball & Softball Batting Ranges, Frederick
- Baseball & Softball Clubs, Frederick
- Basement Waterproofing - Waterproofing Contractors, Frederick - Foundation & Concrete Waterproofing
- Basketball Clubs & Instruction, Frederick
- Bath Equipment & Supplies, Frederick
- Bathroom Accessories, Frederick
- Bathroom Fixtures, Frederick - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Frederick - Bathroom Remodel & Planning Services
- Bathtub, Sink & Tile Contractors, Frederick - Installation & Repair Services
- Bathtubs & Sinks - Repair & Refinishing, Frederick - Bathtub Refinishing, Repair & Resurfacing
- Batteries Dry Cell Manufacturers, Frederick
- Batteries Dry Cell Wholesale, Frederick
- Batteries Storage Manufacturers, Frederick
- Battery, Frederick - Retail Batteries Stores
- Battery Manufacturers, Frederick
- Battery Repair & Rebuilding, Frederick
- Battery Storage, Frederick
- Battery Stores, Frederick
- Battery Supplies, Frederick
- Beach & Water Related Services, Frederick
- Beads Decor, Frederick
- Bearings, Frederick
- Beauty Consultants, Frederick
- Beauty Salons, Frederick
- Bed & Breakfast, Frederick
- Bedroom Furniture Stores, Frederick - Master & Kids Bedroom Furniture Sets & Beds
- Beef Restaurants, Frederick
- Beer & Ale - Wholesale, Frederick
- Beer & Wine Stores, Frederick
- Beer Taverns, Frederick
- Behavioral Health Doctors, Physicians & Surgeons, Frederick - Behavioral Medicine
- Bereavement Services, Frederick
- Beverage Dispenser Supplies & Equipment , Frederick - Beverage Dispensing
- Beverage Stores, Frederick
- Beverages, Frederick
- Bible Church, Frederick
- Bicycle Parts & Accessories, Frederick
- Bicycle Rentals, Frederick - Bike Rental
- Bicycle Repair & Service, Frederick - Bike Repair Shops
- Bicycle Shops, Frederick - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Big & Tall Men's Clothing, Frederick
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- Billing Services, Frederick
- Bingo Halls, Supplies & Equipment, Frederick
- Binoculars & Telescopes, Frederick
- Biological Products & Supplies, Frederick
- Biological Research, Frederick - Biological Labs
- Bird Feeders & Supplies, Frederick
- Bird Repellent, Barrier & Control, Frederick
- Birth Control & Family Planning Clinics, Frederick
- Bistros, Frederick
- Blacksmiths, Frederick
- Blood Bank & Center, Frederick
- Blouses, Shirts & Sweater Manufacturers, Frederick
- Blue Printing Dispensing Supplies & Equipment, Frederick
- Blueprint Service, Frederick - Blueprinting Services
- Boat Services, Frederick
- Boat Storage , Frederick - Equipment & Services
- Boating & Swimming Clubs, Frederick
- Boats & Yachts, Frederick - Yachts, Sailboats & Boats for Sale
- Boiler Repair & Cleaning, Frederick
- Bonds, Frederick
- Bonds Surety & Fidelity, Frederick
- Book Binders & Folders, Frederick - Office Supplies
- Book Stores, Frederick
- Bookkeeping Services Licensed, Frederick
- Bookkeeping Systems & Services, Frederick
- Books, Magazines & Newspapers Stores, Frederick - Bookstores
- Boot Manufacturers, Frederick
- Boots Retail, Frederick
- Bottled Gas, Lp Gas & Propane Dealers, Frederick
- Boutiques & Boutique Items, Frederick
- Bowling Apparel & Accessories, Frederick
- Bowling Lane Equipment & Supplies, Frederick
- Brake Service & Repair, Frederick - Brake Pads
- Brake Service Equipment, Frederick
- Brakes & Brake Parts, Frederick - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Frederick
- Brethren Church, Frederick
- Brick & Structural Product Manufacturers, Frederick
- Brick Masonry & Bricklayer Contractors, Frederick - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Frederick - Companies, Wholesale, Manufacturers & Suppliers
- Bridge, Tunnel & Elevated Highway Construction, Frederick - Highway, Street And Bridge Contractors
- Brooms & Brushes Manufacturers, Frederick
- Bryant Air Conditioning, Frederick - Air Conditioner Contractors & Systems
- Buddhist Churches, Frederick
- Builders & Contractors, Frederick
- Builders & Contractors - More, Frederick
- Builders Hardware Stores, Frederick
- Building & Home Inspection, Frederick - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Frederick
- Building Cleaning - Exterior, Frederick - Cleaning Service
- Building Construction Consultants, Frederick - Construction Management & Consulting
- Building Design & Construction Consultants, Frederick
- Building Hardware & Materials, Frederick
- Building Materials, Frederick - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Frederick
- Bulletin Boards & Online Services, Frederick
- Burglar & Alarm Service, Frederick - Monitoring Service
- Burglar Alarm Systems, Frederick
- Bus Lines, Frederick - Bus Transportation
- Bus Lines Ticket Agencies, Frederick
- Business & Professional Associations, Frederick
- Business & Trade Organizations, Frederick
- Business Brokers, Frederick
- Business Communication Consultants, Frederick
- Business Insurance, Frederick
- Business Legal Services, Frederick
- Business Management Consultants, Frederick
- Business Services, Frederick
- Business Wholesale, Frederick
- Business, Vocational & Technical, Frederick
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