- Cable TV Companies & Services, South Barrington
- Cafe Restaurants, South Barrington
- Carnival Services, South Barrington
- Carpet Rug & Upholstery Cleaners, South Barrington
- Casual Dining Restaurants, South Barrington
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, South Barrington
- Cellular & Mobile Phone Service, South Barrington
- Central American Restaurants, South Barrington
- Child Care & Day Care Services, South Barrington
- Children & Family Entertainment, South Barrington
- Children's Clothing Stores, South Barrington - Infant, Babies & Kids Clothing
- Chinese Restaurants, South Barrington
- Chiropractic Clinics, South Barrington
- Chiropractor, South Barrington
- City & County Government, South Barrington
- Cleaning & Maintenance Services, South Barrington
- Clinics, South Barrington
- Clothesline Equipment & Supplies, South Barrington - Washing Line - Companies
- Clothing & Accessories Resale & Consignment Shops, South Barrington
- Clothing Stores, South Barrington - Clothes & Accessories
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- Coffee, Espresso & Tea House Restaurants, South Barrington
- Collection Agency Services, South Barrington
- Commercial & Industrial Photographers, South Barrington
- Commercial Equipment, South Barrington
- Communications Services, South Barrington
- Community & Recreational Facilities, South Barrington
- Community Services, South Barrington
- Computer & Audio Visual Services, South Barrington
- Computer System Consultants, South Barrington - IT Consulting Services
- Computer System Designers & Consultants, South Barrington
- Construction, South Barrington
- Construction & Civil Engineer, South Barrington
- Consultants & Services, South Barrington
- Convention & Corporate Accommodations, South Barrington
- Corporate Employees Health Programs, South Barrington
- Cosmetics, South Barrington
- Cosmetics & Perfumes Outlets, South Barrington
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, South Barrington
- Counseling Services, South Barrington
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