- Cabins Cottages & Chalet Rental, East Alton
- Campgrounds, East Alton
- Car Detailing & Wash Service, East Alton - Auto Detailing
- Car Rental, East Alton - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, East Alton
- Carpet & Rug Contractors, East Alton
- Carpet Installation & Cleaning - Commercial & Industrial, East Alton - Rug Cleaners
- Carpet, Rug & Linoleum Flooring Dealers, East Alton
- Casual Dining Restaurants, East Alton
- Caterers Food Services, East Alton
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, East Alton
- Cellular & Mobile Phone Service, East Alton
- Central American Restaurants, East Alton
- Charitable & Non-Profit Organizations, East Alton
- Chemical Products, East Alton - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, East Alton
- Chicken Restaurants, East Alton
- Child Care & Day Care Services, East Alton
- Chinese Restaurants, East Alton
- Chiropractor, East Alton
- Christian Churches, East Alton
- Church Of Christ, East Alton
- Churches 1 Of 3, East Alton
- Churches 2 Of 3, East Alton
- Cigar, Cigarette & Tobacco Store & Supplies, East Alton
- City & County Administrative Agencies, East Alton
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- City & County Government, East Alton
- Cleaning & Maintenance Services, East Alton
- Cleaning Supplies, Systems & Equipment, East Alton - Janitorial Supplies
- CNC Machine Shop, East Alton
- Coin Dealers & Supplies , East Alton
- Colleges & Universities, East Alton
- Commercial & Industrial Laundry, East Alton
- Commercial Printing Manufacturers, East Alton
- Communications Services, East Alton
- Community & Recreational Facilities, East Alton
- Community Based Residential Facilities, East Alton
- Community Church, East Alton
- Community Churches, East Alton
- Community Services, East Alton
- Construction, East Alton
- Consultants & Services, East Alton
- Contractor Equipment & Supplies, East Alton - Construction Equipment & Machinery
- Contractors Supplies & Equipment, East Alton
- Convenience Stores, East Alton
- Copper & Copper Products, East Alton
- Copper Fabricators, East Alton
- Credit Unions, East Alton
- Cremation Services, Supplies & Equipment, East Alton
- Cultural & Regional Art, East Alton
- Custom Made Boots & Shoes, East Alton
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