- Campgrounds, Clarklake
- Casual Dining Restaurants, Clarklake
- Catholic Churches, Clarklake
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Clarklake
- Cellular & Mobile Phone Service, Clarklake
- Chimney & Fireplace Construction Contractors, Clarklake - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Clarklake - Fireplace - Chimney Sweep Services
- City & County Administrative Agencies, Clarklake
- City & County Government, Clarklake
- Clergy, Clarklake
- CNC Machine Shop, Clarklake
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- Commercial Printing Manufacturers, Clarklake
- Communications Services, Clarklake
- Community Services, Clarklake
- Construction, Clarklake
- Construction Equipment & Supplies, Clarklake
- Consultants & Services, Clarklake
- Contractors Supplies & Equipment, Clarklake
- Convenience Stores, Clarklake
- Copier & Copy Machine Sales, Supplies, Service & Repair, Clarklake
- Copier & Copy Machine Supplies, Equipment & Parts, Clarklake
- Copying & Duplicating Services, Clarklake
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