- Canoe & Kayak Rental, Collinsville
- Canoes & Kayaks, Collinsville - Equipment, Gear, PFD, Paddles & Accessories
- Cargo Containers, Collinsville - Freight Containers
- Carpet & Rug Cleaners Water Extraction & Restoration, Collinsville
- Carpet Rug & Upholstery Cleaners, Collinsville
- Casual Dining Restaurants, Collinsville
- Ceiling Contractors, Collinsville - Ceilings
- Chemicals & Related Products, Collinsville
- Child Care & Day Care Services, Collinsville
- Churches 1 Of 3, Collinsville
- Churches 2 Of 3, Collinsville
- City & County Government, Collinsville
- Cleaning & Maintenance Services, Collinsville
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- Cleaning & Restoration Contractors, Including Sandblasting, Collinsville
- CNC Machine Shop, Collinsville
- Commercial & Industrial Photographers, Collinsville
- Commercial Printing, Collinsville
- Commercial Printing Manufacturers, Collinsville
- Commodity & Merchandise Storage & Warehouse, Collinsville - Warehousing
- Community Services, Collinsville
- Computer & Laptop Repair, Collinsville - PC Repair Services
- Computer Repair, Collinsville
- Congregational Church, Collinsville
- Construction, Collinsville
- Construction & Civil Engineer, Collinsville
- Consultants & Services, Collinsville
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