- Cabinets & Cabinet Hardware, Frederick
- Cabinets Refacing, Refinishing & Building, Frederick - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cabins Cottages & Chalet Rental, Frederick
- Cable TV Companies & Services, Frederick
- Cafe Restaurants, Frederick
- California Cuisine Restaurants, Frederick
- Calvary Chapel Church, Frederick
- Camera Stores - Supplies & Services, Frederick - Camera Repair & Service Shops
- Cameras & Photographic Equipment & Supplies, Frederick - Camera Shops
- Campgrounds, Frederick
- Camping Supplies & Equipment Stores, Frederick - Tents, Gear & Accessories
- Candy, Nut & Confectionery Wholesale & Retail, Frederick - Candy Stores
- Car Alarms & Security Systems, Frederick - Remote Car Starter, etc
- Car Detailing & Wash Service, Frederick - Auto Detailing
- Car Rental, Frederick - Rental Cars & Lease Service
- Car Tune Up Service, Frederick - Auto Tune Up
- Car Wash, Cleaning, Wax & Polish Service, Frederick
- Cardiologists, Frederick - Heart Doctors, Physicians & Surgeons (Cardiology)
- Career & Vocational Counseling, Frederick
- Carnivals, Fairs & Exhibitions, Frederick
- Carpenters, Frederick - Carpentry Contractors
- Carpet Manufacturers & Finishers, Frederick
- Carpet & Rug Cleaners Water Extraction & Restoration, Frederick
- Carpet Rug & Upholstery Cleaners, Frederick
- Carpet, Rug & Linoleum Flooring Dealers, Frederick
- Carrier Air Conditioning, Frederick - Air Conditioner Contractors & Systems
- Cars, Truck, Van & SUV Car Dealerships, Frederick - Auto Dealers
- Cash Registers & Supplies, Frederick
- Caskets Burial, Frederick
- Casual Dining Restaurants, Frederick
- Catalog Services, Frederick
- Catalog, Mail-Order & Electronic Shopping, Frederick
- Caterers Food Services, Frederick
- Catering Information Service, Frederick
- Catholic Churches, Frederick
- CD-ROM Duplication, Frederick
- CD-ROM Services, Frederick
- Ceiling & Electric Fans, Frederick
- Ceiling Contractors, Frederick - Ceilings
- Cell & Mobile Installation Repairs, Frederick
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Frederick
- Cellular & Mobile Phone Service, Frederick
- Cellular & Wireless Telephones Rental & Leasing, Frederick
- Cement Manufacturers, Frederick
- Central American Restaurants, Frederick
- Ceramic Tile, Frederick - Wholesale, Manufacturers & Suppliers
- Ceramic Tile Flooring, Frederick
- Ceramic Tile Installation - Repair, Frederick - Ceramic Tiles Contractors
- Chambers Of Commerce, Frederick
- Charismatic Church, Frederick
- Charitable & Non-Profit Organizations, Frederick
- Chauffeur Service, Frederick
- Check Advance Service, Frederick
- Check Cashing Services, Frederick
- Chef, Frederick
- Chemical & Agricultural Industrial Equipment, Frederick
- Chemical Preparations, Frederick
- Chemical Product Manufacturers, Frederick
- Chemical Products, Frederick - Chemical Distributors, Dealers, Wholesale, etc
- Chicken Restaurants, Frederick
- Child Care & Day Care Services, Frederick
- Child Care - Day Care - Private, Frederick
- Child Day Care Information & Referral Services, Frederick
- Child Related Social Services, Frederick
- Children & Family Entertainment, Frederick
- Children's Clothing Stores, Frederick - Infant, Babies & Kids Clothing
- Childrens & Infant Clothing Manufacturers, Frederick
- Childrens After School Programs, Frederick
- Chimney & Fireplace Construction Contractors, Frederick - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Frederick - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Frederick
- Chiropractic Clinics, Frederick
- Chiropractic Information & Referral Services, Frederick - Educational, Referral & Support Service Centers
- Chiropractor, Frederick
- Christian Churches, Frederick
- Church Of Christ, Frederick
- Church Of God, Frederick
- Church Of Jesus Christ Of Latter Day Saints, Frederick
- Church Of The Nazarene, Frederick
- Churches 1 Of 3, Frederick
- Churches 2 Of 3, Frederick
- Churches 3 Of 3, Frederick
- Churches Christian Science, Frederick
- Cigar, Cigarette & Tobacco Store & Supplies, Frederick
- City & County Administrative Agencies, Frederick
- City & County Government, Frederick
- City & County Law Enforcement, Frederick
- Cleaning & Maintenance Services, Frederick
- Cleaning & Restoration Contractors, Including Sandblasting, Frederick
- Cleaning Roof Siding Patio Sidewalks Etcetera, Frederick
- Cleaning Supplies & Equipment, Frederick
- Cleaning Supplies & Products, Frederick
- Clergy, Frederick
- Clinics, Frederick
- Clocks Retail, Frederick
- Clothing & Accessories Resale & Consignment Shops, Frederick
- Clothing Stores, Frederick - Clothes & Accessories
- Clutches, Frederick
- Clutches & Facings, Frederick
- CNC Machine Shop, Frederick
- Coating Engraving & Allied Services Manufacturing, Frederick
- Cocktail Lounges, Frederick
- Coffee, Frederick
- Coffee & Tea Stores, Frederick
- Coffee, Espresso & Tea House Restaurants, Frederick
- Coin Dealers & Supplies , Frederick
- Coin Operated Machines & Equipment, Frederick
- Collectibles, Frederick
- Colleges & Universities, Frederick
- Color & Style Consultants, Frederick
- Comic Book Stores, Frederick
- Commercial & Industrial Laundry, Frederick
- Commercial & Industrial Photographers, Frederick
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- Commercial & Literacy Writings, Frederick
- Commercial Equipment, Frederick
- Commercial Printing, Frederick
- Commercial Printing Manufacturers, Frederick
- Commercial, Industrial & Office Space for Rent & Lease, Frederick
- Commodity & Merchandise Storage & Warehouse, Frederick - Warehousing
- Communication Equipment & Systems, Frederick
- Communications Consultants, Frederick
- Communications Contractors, Frederick
- Communications Services, Frederick
- Communications Systems & Equipment Rental & Leasing, Frederick
- Community & Recreational Facilities, Frederick
- Community Centers, Frederick
- Community Church, Frederick
- Community Churches, Frederick
- Community Services, Frederick
- Computer & Audio Visual Services, Frederick
- Computer & Equipment Rental & Leasing, Frederick
- Computer & Laptop Repair, Frederick - PC Repair Services
- Computer & Software Stores, Frederick
- Computer Cable & Wire Installation, Frederick
- Computer Graphics, Frederick
- Computer Graphics Services, Frederick
- Computer Manufacturers, Frederick
- Computer Networks, Frederick - Design & Systems
- Computer Programming & Software Development Services, Frederick
- Computer Repair, Frederick
- Computer Room - Installation & Equipment, Frederick
- Computer Security Services & Equipment, Frederick
- Computer Services, Frederick
- Computer Software & Services, Frederick
- Computer Software & Services Network Solutions, Frederick
- Computer Software Service, Frederick
- Computer Stores, Frederick
- Computer Stores - Other, Frederick
- Computer System Consultants, Frederick - IT Consulting Services
- Computer System Designer & Consultant, Frederick
- Computer System Designers & Consultants, Frederick
- Concrete, Frederick - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Frederick
- Concrete & Pumice Bricks, Frederick
- Concrete Construction Forms & Accessories, Frederick
- Concrete Contractors, Frederick - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Frederick
- Condiments & Sauces, Frederick
- Condominiums & Townhomes for Rent, Frederick - Townhouses & Condos for Rent & Lease
- Construction, Frederick
- Construction & Civil Engineer, Frederick
- Construction Companies, Frederick
- Construction Equipment Rental & Leasing, Frederick
- Construction Services, Frederick
- Consultants & Services, Frederick
- Contact Lenses, Frederick
- Contractor Equipment & Supplies, Frederick - Construction Equipment & Machinery
- Contractors Equipment & Supplies - Rental & Leasing, Frederick
- Contractors Supplies & Equipment, Frederick
- Control Systems & Regulators, Frederick
- Convalescent Homes Placement Services, Frederick - Convalescent Care
- Convenience Stores, Frederick
- Convention & Meeting Facilities, Frederick - Meeting Rooms
- Convention Services - Other, Frederick
- Cookies, Frederick
- Cooking Schools, Frederick
- Cooking Services, Frederick
- Cooking, Food & Beverage Equipment, Frederick
- Cooling System & Parts, Frederick - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Frederick
- Copier & Copy Machine Supplies, Equipment & Parts, Frederick
- Copier Repair & Service, Frederick
- Copying & Duplicating Services, Frederick
- Copyright, Patent & Trademark Attorneys & Lawyers, Frederick
- Copyright, Patent & Trademark Attorneys & Lawyers, Frederick
- Copyright, Patent & Trademark Lawyers & Attorneys, Frederick
- Corporate Attorneys & Lawyers, Frederick
- Corporate Lawyers & Attorneys, Frederick
- Corrective Training, Frederick
- Correspondence & Writing Schools, Frederick
- Cosmetics, Frederick
- Cosmetics & Perfumes Outlets, Frederick
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Frederick
- Cosmetology School, Frederick
- Costume Sales & Rental, Frederick
- Counseling Professionals, Frederick
- Counseling Services, Frederick
- Counter Tops, Frederick
- County Police, Frederick
- Courier Service, Frederick
- Court Reporter , Frederick - Stenographer & Convention Reporters
- Covenant Churches, Frederick
- Coverall Supplies & Services, Frederick
- Crab House Restaurants, Frederick
- Craft Supplies, Frederick - Hobby & Craft Stores
- Crane Services, Frederick
- Cranes Hoisting & Rigging Service, Frederick - Crane Rental Service
- Credit & Debt Counseling Services, Frederick
- Credit Card Merchant Services, Frederick
- Credit Card Plan Services, Frederick
- Credit Unions, Frederick
- Cremation Services, Supplies & Equipment, Frederick
- Criminal Attorneys & Lawyers, Frederick
- Criminal Defense Attorneys & Lawyers, Frederick
- Criminal Defense Lawyers & Attorneys, Frederick
- Cruise Agents, Frederick - Travel Agents
- Cruise Lines, Frederick - Cruises
- Crushed Stone & Rock, Frederick - Crushed Granite, Concrete, Gravel, etc
- Cuban Restaurants, Frederick
- Custom Designed Replica Car Dealers, Frederick - Auto Dealers
- Custom Furniture, Frederick - Furniture Designers & Custom Builders
- Custom Made Boots & Shoes, Frederick
- Custom Parts & Accessories, Frederick
- Custom Sewing & Alterations, Frederick
- Customer Service Representatives, Frederick
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