- Cabins Cottages & Chalet Rental, Guerneville
- Cafe Restaurants, Guerneville
- Campgrounds, Guerneville
- Canoes & Kayaks, Guerneville - Equipment, Gear, PFD, Paddles & Accessories
- Casual Dining Restaurants, Guerneville
- Catholic Churches, Guerneville
- Central American Restaurants, Guerneville
- Chambers Of Commerce, Guerneville
- Child Care & Day Care Services, Guerneville
- Christian Churches, Guerneville
- Church Of Christ, Guerneville
- City & County Administrative Agencies, Guerneville
- City & County Government, Guerneville
- Clinics, Guerneville
- Clothing Stores, Guerneville - Clothes & Accessories
- Coffee & Tea Stores, Guerneville
- Coffee, Espresso & Tea House Restaurants, Guerneville
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- Collectibles, Guerneville
- Commercial Printing Manufacturers, Guerneville
- Communications Services, Guerneville
- Community Services, Guerneville
- Computer & Audio Visual Services, Guerneville
- Computer & Laptop Repair, Guerneville - PC Repair Services
- Computer & Software Stores, Guerneville
- Computer Repair, Guerneville
- Computer Stores, Guerneville
- Construction, Guerneville
- Construction Services, Guerneville
- Consultants & Services, Guerneville
- Copying & Duplicating Services, Guerneville
- Coroners, Guerneville
- Credit Unions, Guerneville
- Custom Furniture, Guerneville - Furniture Designers & Custom Builders
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