- Cafe Restaurants, Kleinburg
- Cakes, Pies, & Pastries, Kleinburg
- Candy, Nut & Confectionery Wholesale & Retail, Kleinburg - Candy Stores
- Canoes & Kayaks, Kleinburg - Equipment, Gear, PFD, Paddles & Accessories
- Cargo Containers, Kleinburg - Freight Containers
- Carpet Rug & Upholstery Cleaners, Kleinburg
- Cars, Truck, Van & SUV Car Dealerships, Kleinburg - Auto Dealers
- Casual Dining Restaurants, Kleinburg
- Catholic Churches, Kleinburg
- Child Care & Day Care Services, Kleinburg
- Children's Clothing Stores, Kleinburg - Infant, Babies & Kids Clothing
- Christian Churches, Kleinburg
- Churches 1 Of 3, Kleinburg
- Cleaning & Maintenance Services, Kleinburg
- Coffee, Espresso & Tea House Restaurants, Kleinburg
- Collectibles, Kleinburg
- Commercial Equipment, Kleinburg
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- Commercial Printing Manufacturers, Kleinburg
- Communications Consultants, Kleinburg
- Community Church, Kleinburg
- Community Churches, Kleinburg
- Community Services, Kleinburg
- Computer & Audio Visual Services, Kleinburg
- Computer & Software Stores, Kleinburg
- Computer Repair, Kleinburg
- Computer System Consultants, Kleinburg - IT Consulting Services
- Condiments & Sauces, Kleinburg
- Construction, Kleinburg
- Construction Companies, Kleinburg
- Consultants & Services, Kleinburg
- Convenience Stores, Kleinburg
- Cookies, Kleinburg
- Cosmetics, Kleinburg
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