- Cafe Restaurants, Duvall
- Campgrounds, Duvall
- Carpet Rug & Upholstery Cleaners, Duvall
- Carpet, Rug & Linoleum Flooring Dealers, Duvall
- Cars, Truck, Van & SUV Car Dealerships, Duvall - Auto Dealers
- Casual Dining Restaurants, Duvall
- Catalog Compilers, Duvall
- Catalog Designers & Compilers, Duvall
- Catalog Services, Duvall
- Catholic Churches, Duvall
- Cellular & Mobile Phone Service, Duvall
- Ceramic Tile Flooring, Duvall
- Ceramic Tile Installation - Repair, Duvall - Ceramic Tiles Contractors
- Chambers Of Commerce, Duvall
- Child Care & Day Care Services, Duvall
- Chinese Restaurants, Duvall
- Chiropractor, Duvall
- Christian Churches, Duvall
- Churches 1 Of 3, Duvall
- Cigar, Cigarette & Tobacco Store & Supplies, Duvall
- City & County Administrative Agencies, Duvall
- City & County Government, Duvall
- City & County Law Enforcement, Duvall
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- Cleaning & Maintenance Services, Duvall
- Clinics, Duvall
- Clothing & Accessories Resale & Consignment Shops, Duvall
- CNC Machine Shop, Duvall
- Coffee, Duvall
- Coffee & Tea Stores, Duvall
- Coffee, Espresso & Tea House Restaurants, Duvall
- Commercial & Industrial Laundry, Duvall
- Commercial Printing, Duvall
- Commercial Printing Manufacturers, Duvall
- Communications Services, Duvall
- Community Church, Duvall
- Community Churches, Duvall
- Community Services, Duvall
- Computer & Laptop Repair, Duvall - PC Repair Services
- Computer Repair, Duvall
- Concrete Contractors, Duvall - Concrete Construction & Concrete Companies
- Construction, Duvall
- Consulates & Embassies, Duvall
- Consultants & Services, Duvall
- Convention & Meeting Facilities, Duvall - Meeting Rooms
- County Police, Duvall
- Custom Parts & Accessories, Duvall
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