- Cable TV Companies & Services, Frederick
- Campgrounds, Frederick
- Car Detailing & Wash Service, Frederick - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Frederick
- Cars, Truck, Van & SUV Car Dealerships, Frederick - Auto Dealers
- Casual Dining Restaurants, Frederick
- Caterers Food Services, Frederick
- Catholic Churches, Frederick
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Frederick
- Cellular & Mobile Phone Service, Frederick
- Central American Restaurants, Frederick
- Chambers Of Commerce, Frederick
- Chiropractic Clinics, Frederick
- Chiropractor, Frederick
- Christian Churches, Frederick
- Church Of Christ, Frederick
- Church Of The Living God, Frederick
- Churches 1 Of 3, Frederick
- City & County Administrative Agencies, Frederick
- City & County Government, Frederick
- City & County Law Enforcement, Frederick
- Clinics, Frederick
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- CNC Machine Shop, Frederick
- Commercial Printing, Frederick
- Commercial Printing Manufacturers, Frederick
- Communications Services, Frederick
- Community & Recreational Facilities, Frederick
- Community Centers, Frederick
- Community Services, Frederick
- Concrete, Frederick - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Frederick
- Concrete Product Manufacturers, Frederick
- Construction, Frederick
- Construction Services, Frederick
- Consultants & Services, Frederick
- Contact Lenses, Frederick
- Convenience Stores, Frederick
- Counseling Services, Frederick
- County Police, Frederick
- Criminal Attorneys & Lawyers, Frederick
- Criminal Defense Attorneys & Lawyers, Frederick
- Criminal Defense Lawyers & Attorneys, Frederick
- Crop Planting & Protecting, Frederick - Soil Preparation & Cultivating
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