- Carbide Metal Products, Clairton
- Carbon Products, Clairton
- Cardiologists, Clairton - Heart Doctors, Physicians & Surgeons (Cardiology)
- Carpet Rug & Upholstery Cleaners, Clairton
- Carpet, Rug & Linoleum Flooring Dealers, Clairton
- Cars, Truck, Van & SUV Car Dealerships, Clairton - Auto Dealers
- Casual Dining Restaurants, Clairton
- Catholic Churches, Clairton
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Clairton
- Cellular & Mobile Phone Service, Clairton
- Chemical Manufacturers, Clairton
- Chemical Product Manufacturers, Clairton
- Chemical Products, Clairton - Chemical Distributors, Dealers, Wholesale, etc
- Child Care & Day Care Services, Clairton
- Chinese Restaurants, Clairton
- Chiropractor, Clairton
- Church Of God, Clairton
- Churches 1 Of 3, Clairton
- City & County Government, Clairton
- Cleaning & Maintenance Services, Clairton
- Cleaning & Restoration Contractors, Including Sandblasting, Clairton
- Clergy, Clairton
- Clinics, Clairton
- Clothing Stores, Clairton - Clothes & Accessories
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- CNC Machine Shop, Clairton
- Coffee & Tea Stores, Clairton
- Coffee, Espresso & Tea House Restaurants, Clairton
- Commercial Equipment, Clairton
- Commercial Printing, Clairton
- Communications Services, Clairton
- Community Services, Clairton
- Computer & Laptop Repair, Clairton - PC Repair Services
- Computer Repair, Clairton
- Conservative Synagogues, Clairton
- Construction, Clairton
- Construction Estimators, Clairton
- Construction Inspectors, Clairton
- Construction Services, Clairton
- Consultants & Services, Clairton
- Convenience Stores, Clairton
- Convention & Meeting Facilities, Clairton - Meeting Rooms
- Cooking, Food & Beverage Equipment, Clairton
- Cooling System & Parts, Clairton - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Clairton
- Copying & Duplicating Services, Clairton
- Courts Construction Indoor & Outdoor, Clairton
- Cremation Services, Supplies & Equipment, Clairton
- Curtains, Drapes & Window Treatments and Coverings, Clairton - Drapery & Upholstery Fabric Stores
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