- Cafe Restaurants, Clarksville
- Car Detailing & Wash Service, Clarksville - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Clarksville
- Carpet Rug & Upholstery Cleaners, Clarksville
- Cars, Truck, Van & SUV Car Dealerships, Clarksville - Auto Dealers
- Casual Dining Restaurants, Clarksville
- Catholic Churches, Clarksville
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Clarksville
- Cellular & Mobile Phone Service, Clarksville
- Central American Restaurants, Clarksville
- Chambers Of Commerce, Clarksville
- Child Related Social Services, Clarksville
- Chinese Restaurants, Clarksville
- Churches 1 Of 3, Clarksville
- Churches 3 Of 3, Clarksville
- Churches Seventh Day Adventist, Clarksville
- City & County Administrative Agencies, Clarksville
- City & County Government, Clarksville
- City & County Law Enforcement, Clarksville
- Cleaning & Maintenance Services, Clarksville
- Cleaning & Restoration Contractors, Including Sandblasting, Clarksville
- Clinics, Clarksville
- Clock Repair, Clarksville
- Clothing Stores, Clarksville - Clothes & Accessories
- Coin Dealers & Supplies , Clarksville
- Commercial & Industrial Laundry, Clarksville
- Communications Services, Clarksville
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- Community & Recreational Facilities, Clarksville
- Community Centers, Clarksville
- Community Church, Clarksville
- Community Churches, Clarksville
- Community Services, Clarksville
- Computer & Audio Visual Services, Clarksville
- Computer & Software Stores, Clarksville
- Computer Graphics, Clarksville
- Computer Graphics & Imaging, Clarksville
- Computer Graphics Services, Clarksville
- Computer Stores, Clarksville
- Computer Stores - Other, Clarksville
- Computer System Consultants, Clarksville - IT Consulting Services
- Computer System Designers & Consultants, Clarksville
- Construction, Clarksville
- Construction Companies, Clarksville
- Construction Estimators, Clarksville
- Construction Services, Clarksville
- Consultants & Services, Clarksville
- Convenience Stores, Clarksville
- Counseling Services, Clarksville
- Country Clubs, Clarksville
- County Police, Clarksville
- Craft Supplies, Clarksville - Hobby & Craft Stores
- Credit Card Merchant Services, Clarksville
- Credit Card Plan Services, Clarksville
- Cremation Services, Supplies & Equipment, Clarksville
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