- Cable TV Companies & Services, Janesville
- Cafe Restaurants, Janesville
- Campgrounds, Janesville
- Car Detailing & Wash Service, Janesville - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Janesville
- Cargo Containers, Janesville - Freight Containers
- Casual Dining Restaurants, Janesville
- Caterers Food Services, Janesville
- Catholic Churches, Janesville
- Chambers Of Commerce, Janesville
- Chimney Cleaning & Repair, Janesville - Fireplace - Chimney Sweep Services
- Chiropractor, Janesville
- Churches 1 Of 3, Janesville
- Churches 2 Of 3, Janesville
- City & County Government, Janesville
- City & County Law Enforcement, Janesville
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- Clinics, Janesville
- Commercial Printing, Janesville
- Communications Services, Janesville
- Community & Recreational Facilities, Janesville
- Community Church, Janesville
- Community Churches, Janesville
- Community Services, Janesville
- Construction, Janesville
- Consultants & Services, Janesville
- Convenience Stores, Janesville
- Convents & Monasteries, Janesville
- County Police, Janesville
- Cremation Services, Supplies & Equipment, Janesville
- Crop Planting & Protecting, Janesville - Soil Preparation & Cultivating
- Cyber Cafes, Janesville
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