- Carpet Rug & Upholstery Cleaners, Collinsville
- Casual Dining Restaurants, Collinsville
- Central American Restaurants, Collinsville
- Child Care & Day Care Services, Collinsville
- Christian Churches, Collinsville
- Churches 1 Of 3, Collinsville
- City & County Administrative Agencies, Collinsville
- City & County Government, Collinsville
- Cleaning & Maintenance Services, Collinsville
- Clinics, Collinsville
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- Commercial Printing, Collinsville
- Community Services, Collinsville
- Computer & Audio Visual Services, Collinsville
- Computer Cable & Wire Installation, Collinsville
- Computer Room - Installation & Equipment, Collinsville
- Construction, Collinsville
- Consultants & Services, Collinsville
- Convenience Stores, Collinsville
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Collinsville
- Covenant Churches, Collinsville
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