- Campgrounds, Alton
- Casual Dining Restaurants, Alton
- Chimney & Fireplace Construction Contractors, Alton - Installation, Cleaning & Repair Services
- Chiropractic Clinics, Alton
- Chiropractor, Alton
- Churches 1 Of 3, Alton
- City & County Government, Alton
- City & County Law Enforcement, Alton
- Clinics, Alton
- CNC Machine Shop, Alton
- Coffee, Alton
- Coffee, Espresso & Tea House Restaurants, Alton
- Commercial Equipment, Alton
- Communications Services, Alton
- Community & Recreational Facilities, Alton
- Community Centers, Alton
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- Community Church, Alton
- Community Churches, Alton
- Community Services, Alton
- Computer & Software Stores, Alton
- Computer Networks, Alton - Design & Systems
- Computer Repair, Alton
- Computer Software & Services, Alton
- Computer Software Service, Alton
- Concrete Contractors, Alton - Concrete Construction & Concrete Companies
- Construction, Alton
- Construction & Civil Engineer, Alton
- Construction Services, Alton
- Consultants & Services, Alton
- Contractors Supplies & Equipment, Alton
- County Police, Alton
- Cremation Services, Supplies & Equipment, Alton
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