- Cable Conduit & Pole Contractors, Dunnville
- Cafe Restaurants, Dunnville
- Campers & Pick-Up Canopies Parts & Supplies, Dunnville
- Campgrounds, Dunnville
- Candy, Nut & Confectionery Wholesale & Retail, Dunnville - Candy Stores
- Canvas Goods & Products, Dunnville
- Car Detailing & Wash Service, Dunnville - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Dunnville
- Carpet & Rug Cleaners Water Extraction & Restoration, Dunnville
- Carpet Rug & Upholstery Cleaners, Dunnville
- Carpet, Rug & Linoleum Flooring Dealers, Dunnville
- Cars, Truck, Van & SUV Car Dealerships, Dunnville - Auto Dealers
- Casual Dining Restaurants, Dunnville
- Catalog Services, Dunnville
- Catalog, Mail-Order & Electronic Shopping, Dunnville
- Caterers Food Services, Dunnville
- Catholic Churches, Dunnville
- Cement Retail, Dunnville
- Charitable & Non-Profit Organizations, Dunnville
- Chemical Products, Dunnville - Chemical Distributors, Dealers, Wholesale, etc
- Child Care & Day Care Services, Dunnville
- Child Related Social Services, Dunnville
- Chinese Grocery Stores, Dunnville
- Chiropractor, Dunnville
- Christian Churches, Dunnville
- Churches 1 Of 3, Dunnville
- Churches 2 Of 3, Dunnville
- Churches 3 Of 3, Dunnville
- Cistern Builders, Dunnville
- City & County Administrative Agencies, Dunnville
- City & County Government, Dunnville
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- Cleaning & Maintenance Services, Dunnville
- Cleaning & Restoration Contractors, Including Sandblasting, Dunnville
- Cleaning Supplies & Equipment, Dunnville
- Clinics, Dunnville
- Clothing Stores, Dunnville - Clothes & Accessories
- CNC Machine Shop, Dunnville
- Coffee, Dunnville
- Colleges & Universities, Dunnville
- Commercial & Industrial Laundry, Dunnville
- Commercial Equipment, Dunnville
- Commercial Printing Manufacturers, Dunnville
- Communications Cable Contractors, Dunnville
- Community & Recreational Facilities, Dunnville
- Community Services, Dunnville
- Computer & Software Stores, Dunnville
- Computer Networks, Dunnville - Design & Systems
- Computer Repair, Dunnville
- Concrete Contractors, Dunnville - Concrete Construction & Concrete Companies
- Condiments & Sauces, Dunnville
- Construction, Dunnville
- Construction Companies, Dunnville
- Construction Equipment & Supplies, Dunnville
- Consultants & Services, Dunnville
- Contractor Equipment & Supplies, Dunnville - Construction Equipment & Machinery
- Convenience Stores, Dunnville
- Cooking, Food & Beverage Equipment, Dunnville
- Cooling System & Parts, Dunnville - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Country Cooking Restaurants, Dunnville
- Credit Unions, Dunnville
- Crude Petroleum & Natural Gas, Dunnville
- Cyber Cafes, Dunnville
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