- Cafe Restaurants, Clayton
- Candy Manufacturers, Clayton
- Candy, Nut & Confectionery Wholesale & Retail, Clayton - Candy Stores
- Carpet Installation & Cleaning - Commercial & Industrial, Clayton - Rug Cleaners
- Carpet Rug & Upholstery Cleaners, Clayton
- Carpet, Rug & Linoleum Flooring Dealers, Clayton
- Cars, Truck, Van & SUV Car Dealerships, Clayton - Auto Dealers
- Casual Dining Restaurants, Clayton
- Christian Churches, Clayton
- Church Of Christ, Clayton
- Church Of God, Clayton
- Church Of The Brethren, Clayton
- Churches 1 Of 3, Clayton
- Churches 2 Of 3, Clayton
- Churches Seventh Day Adventist, Clayton
- City & County Government, Clayton
- Cleaning & Maintenance Services, Clayton
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- Cleaning & Restoration Contractors, Including Sandblasting, Clayton
- Clergy, Clayton
- Clinics, Clayton
- CNC Machine Shop, Clayton
- Commercial Equipment, Clayton
- Community Services, Clayton
- Computer & Audio Visual Services, Clayton
- Concrete Contractors, Clayton - Concrete Construction & Concrete Companies
- Condiments & Sauces, Clayton
- Construction, Clayton
- Consultants & Services, Clayton
- Continuing Education, Clayton
- Convention & Meeting Facilities, Clayton - Meeting Rooms
- Cooking, Food & Beverage Equipment, Clayton
- Cooling System & Parts, Clayton - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Counseling Professionals, Clayton
- Country Clubs, Clayton
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