- Cafe Restaurants, Irwindale
- Cameras & Photographic Equipment & Supplies, Irwindale - Camera Shops
- Candy, Nut & Confectionery Wholesale & Retail, Irwindale - Candy Stores
- Carbon Monoxide Detection & Alarms, Irwindale
- Carnivals, Fairs & Exhibitions, Irwindale
- Carpenters, Irwindale - Carpentry Contractors
- Casual Dining Restaurants, Irwindale
- Chemical Cleaning, Irwindale
- Chemical Products, Irwindale - Chemical Distributors, Dealers, Wholesale, etc
- Cigar, Cigarette & Tobacco Store & Supplies, Irwindale
- Clay Products Manufacturers, Irwindale
- Cleaning & Restoration Contractors, Including Sandblasting, Irwindale
- Clinics, Irwindale
- CNC Machine Shop, Irwindale
- Coaching Business & Personal, Irwindale
- Commercial Equipment, Irwindale
- Commercial Printing, Irwindale
- Commercial Printing Manufacturers, Irwindale
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- Community Services, Irwindale
- Concrete, Irwindale - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Irwindale
- Concrete Contractors, Irwindale - Concrete Construction & Concrete Companies
- Concrete Handling Services, Irwindale - Concrete Pumping
- Concrete Product Manufacturers, Irwindale
- Construction, Irwindale
- Construction & Civil Engineer, Irwindale
- Consultants & Services, Irwindale
- Contractors Equipment & Supplies Dealers Tools Pneumatic, Irwindale
- Convenience Stores, Irwindale
- Conveyor & Conveying Equipment, Irwindale - Conveyor Belt
- Cooking, Food & Beverage Equipment, Irwindale
- Counseling Services, Irwindale
- Courier Service, Irwindale
- Credit Card Manufacturers, Irwindale
- Critical & Emergency Care Doctors, Irwindale - Intensive Care Doctors, Physicians & Surgeons
- Custom Parts & Accessories, Irwindale
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