- Candy, Nut & Confectionery Wholesale & Retail, Alton - Candy Stores
- Car Detailing & Wash Service, Alton - Auto Detailing
- Casual Dining Restaurants, Alton
- Caterers Food Services, Alton
- Catholic Churches, Alton
- Chiropractor, Alton
- Churches 1 Of 3, Alton
- City & County Administrative Agencies, Alton
- City & County Government, Alton
- Clothing Stores, Alton - Clothes & Accessories
- Commercial Equipment, Alton
- Commercial Printing, Alton
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- Community Services, Alton
- Construction, Alton
- Construction Services, Alton
- Consultants & Services, Alton
- Convenience Stores, Alton
- Cooking, Food & Beverage Equipment, Alton
- Copier & Copy Machine Sales, Supplies, Service & Repair, Alton
- Copier & Copy Machine Supplies, Equipment & Parts, Alton
- Copying & Duplicating Services, Alton
- Country Clubs, Alton
- Crop Planting & Protecting, Alton - Soil Preparation & Cultivating
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