- Carpet Rug & Upholstery Cleaners, Alton
- Carpet, Rug & Linoleum Flooring Dealers, Alton
- Casual Dining Restaurants, Alton
- Cellular & Mobile Phone Service, Alton
- Cellular & Wireless Telephones Rental & Leasing, Alton
- Central American Restaurants, Alton
- Child Care & Day Care Services, Alton
- Churches 2 Of 3, Alton
- City & County Government, Alton
- Cleaning & Maintenance Services, Alton
- Cleaning & Restoration Contractors, Including Sandblasting, Alton
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- Clinics, Alton
- Commercial & Industrial Laundry, Alton
- Commercial Equipment, Alton
- Commercial Printing, Alton
- Commercial Printing Manufacturers, Alton
- Communications Services, Alton
- Communications Systems & Equipment Rental & Leasing, Alton
- Community Services, Alton
- Construction, Alton
- Construction Services, Alton
- Convenience Stores, Alton
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