- Cafe Restaurants, Port Colborne
- Canvas Goods & Products, Port Colborne
- Car Detailing & Wash Service, Port Colborne - Auto Detailing
- Carpet Rug & Upholstery Cleaners, Port Colborne
- Carpet, Rug & Linoleum Flooring Dealers, Port Colborne
- Cars, Truck, Van & SUV Car Dealerships, Port Colborne - Auto Dealers
- Casual Dining Restaurants, Port Colborne
- Catholic Churches, Port Colborne
- Central American Restaurants, Port Colborne
- Chambers Of Commerce, Port Colborne
- Chemical Product Manufacturers, Port Colborne
- Chemicals & Related Products, Port Colborne
- Chicken Restaurants, Port Colborne
- Child Care & Day Care Services, Port Colborne
- Child Related Social Services, Port Colborne
- Chinese Grocery Stores, Port Colborne
- Chinese Restaurants, Port Colborne
- Chiropractor, Port Colborne
- Christian Churches, Port Colborne
- Churches 1 Of 3, Port Colborne
- Churches 2 Of 3, Port Colborne
- Churches 3 Of 3, Port Colborne
- City & County Government, Port Colborne
- Cleaning & Maintenance Services, Port Colborne
- Cleaning Chemical Compounds, Port Colborne
- Cleaning Supplies & Products, Port Colborne
- Clock & Watch Stores, Port Colborne
- CNC Machine Shop, Port Colborne
- Coffee, Port Colborne
- Coin Operated Machines & Equipment, Port Colborne
- Commercial & Industrial Laundry, Port Colborne
- Commercial Equipment, Port Colborne
- Commercial Printing, Port Colborne
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- Commercial Printing Manufacturers, Port Colborne
- Communications Contractors, Port Colborne
- Community & Recreational Facilities, Port Colborne
- Community Services, Port Colborne
- Computer & Laptop Repair, Port Colborne - PC Repair Services
- Computer & Software Stores, Port Colborne
- Computer Repair, Port Colborne
- Concrete, Port Colborne - Cement & Concrete Products, Suppliers, Companies
- Concrete & Pumice Bricks, Port Colborne
- Concrete Blocks & Shapes - Commercial & Industrial, Port Colborne
- Concrete Contractors, Port Colborne - Concrete Construction & Concrete Companies
- Concrete Grinding & Finishing, Port Colborne
- Condiments & Sauces, Port Colborne
- Construction, Port Colborne
- Construction Equipment Rental & Leasing, Port Colborne
- Construction Services, Port Colborne
- Consultants & Services, Port Colborne
- Contact Lenses, Port Colborne
- Convenience Stores, Port Colborne
- Convention & Meeting Facilities, Port Colborne - Meeting Rooms
- Conveyor & Conveying Equipment, Port Colborne - Conveyor Belt
- Cooling System & Parts, Port Colborne - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copying & Duplicating Services, Port Colborne
- Corporate Employees Health Programs, Port Colborne
- Country Clubs, Port Colborne
- Country Cooking Restaurants, Port Colborne
- Crane Manufacturers, Port Colborne
- Crane Rental & Leasing, Port Colborne
- Credit & Debt Counseling Services, Port Colborne
- Credit Unions, Port Colborne
- Crude Petroleum & Natural Gas, Port Colborne
- Crushed Stone & Rock, Port Colborne - Crushed Granite, Concrete, Gravel, etc
- Custom Sewing & Alterations, Port Colborne
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