- Cafe Restaurants, Clarksburg
- Campgrounds, Clarksburg
- Carpet Rug & Upholstery Cleaners, Clarksburg
- Casual Dining Restaurants, Clarksburg
- Caterers Food Services, Clarksburg
- CD-ROM Duplication, Clarksburg
- CD-ROM Services, Clarksburg
- Charitable & Non-Profit Organizations, Clarksburg
- Child Care & Day Care Services, Clarksburg
- Children & Family Entertainment, Clarksburg
- Childrens After School Programs, Clarksburg
- Chiropractor, Clarksburg
- Christian Churches, Clarksburg
- Church Of God, Clarksburg
- Churches 1 Of 3, Clarksburg
- Churches Seventh Day Adventist, Clarksburg
- City & County Administrative Agencies, Clarksburg
- City & County Government, Clarksburg
- Cleaning & Maintenance Services, Clarksburg
- Cleaning & Restoration Contractors, Including Sandblasting, Clarksburg
- Clinics, Clarksburg
- Coffee, Clarksburg
- Coffee, Espresso & Tea House Restaurants, Clarksburg
- Collection Agency Services, Clarksburg
- Commercial & Industrial Laundry, Clarksburg
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- Commercial, Industrial & Office Space for Rent & Lease, Clarksburg
- Communications Consultants, Clarksburg
- Communications Services, Clarksburg
- Community Church, Clarksburg
- Community Churches, Clarksburg
- Community Services, Clarksburg
- Computer & Software Stores, Clarksburg
- Computer Networks, Clarksburg - Design & Systems
- Computer Repair, Clarksburg
- Computer Services, Clarksburg
- Computer Software & Services, Clarksburg
- Computer Software Service, Clarksburg
- Computer Stores, Clarksburg
- Computer Stores - Other, Clarksburg
- Condiments & Sauces, Clarksburg
- Condominiums & Townhomes for Rent, Clarksburg - Townhouses & Condos for Rent & Lease
- Construction, Clarksburg
- Construction Companies, Clarksburg
- Construction Services, Clarksburg
- Consultants & Services, Clarksburg
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Clarksburg
- Crane Services, Clarksburg
- Cranes Hoisting & Rigging Service, Clarksburg - Crane Rental Service
- Credit Card Merchant Services, Clarksburg
- Credit Card Plan Services, Clarksburg
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