- Cafe Restaurants, Alton
- Canoe & Kayak Rental, Alton
- Canoes & Kayaks, Alton - Equipment, Gear, PFD, Paddles & Accessories
- Casual Dining Restaurants, Alton
- Cellular & Mobile Phone Service, Alton
- Child Care & Day Care Services, Alton
- Chiropractor, Alton
- Churches 1 Of 3, Alton
- City & County Administrative Agencies, Alton
- City & County Government, Alton
- City & County Law Enforcement, Alton
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- Clinics, Alton
- CNC Machine Shop, Alton
- Communications Services, Alton
- Community & Recreational Facilities, Alton
- Community Centers, Alton
- Community Services, Alton
- Conservation Contractors, Alton
- Construction, Alton
- Consultants & Services, Alton
- Convenience Stores, Alton
- Crushed Stone & Rock, Alton - Crushed Granite, Concrete, Gravel, etc
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