- Cabins Cottages & Chalet Rental, Clayton
- Cafe Restaurants, Clayton
- Candy Manufacturers, Clayton
- Candy, Nut & Confectionery Wholesale & Retail, Clayton - Candy Stores
- Casual Dining Restaurants, Clayton
- Catholic Churches, Clayton
- Chambers Of Commerce, Clayton
- Charitable & Non-Profit Organizations, Clayton
- Child Care & Day Care Services, Clayton
- Chiropractor, Clayton
- Churches 1 Of 3, Clayton
- City & County Government, Clayton
- Cleaning & Restoration Contractors, Including Sandblasting, Clayton
- Clothing Stores, Clayton - Clothes & Accessories
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- Coffee, Espresso & Tea House Restaurants, Clayton
- Collectibles, Clayton
- Colleges & Universities, Clayton
- Commercial & Industrial Photographers, Clayton
- Community & Recreational Facilities, Clayton
- Community Church, Clayton
- Community Churches, Clayton
- Community Services, Clayton
- Computer Networks, Clayton - Design & Systems
- Construction, Clayton
- Consultants & Services, Clayton
- Convenience Stores, Clayton
- Cremation Services, Supplies & Equipment, Clayton
- Crushed Stone & Rock, Clayton - Crushed Granite, Concrete, Gravel, etc
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