- Carpet Rug & Upholstery Cleaners, Thornton
- Casual Dining Restaurants, Thornton
- Chemical Products, Thornton - Chemical Distributors, Dealers, Wholesale, etc
- Churches 1 Of 3, Thornton
- City & County Administrative Agencies, Thornton
- City & County Government, Thornton
- Cleaning & Maintenance Services, Thornton
- Cleaning & Restoration Contractors, Including Sandblasting, Thornton
- CNC Machine Shop, Thornton
- Commercial Equipment, Thornton
- Community Services, Thornton
- Computer & Audio Visual Services, Thornton
- Computer & Software Stores, Thornton
- Computer Programming & Software Development Services, Thornton
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- Computer Repair, Thornton
- Computer Software & Services, Thornton
- Computer Software Service, Thornton
- Concrete, Thornton - Cement & Concrete Products, Suppliers, Companies
- Concrete Contractors, Thornton - Concrete Construction & Concrete Companies
- Condiments & Sauces, Thornton
- Construction, Thornton
- Construction Machinery, Thornton - Mining Machinery
- Consultants & Services, Thornton
- Convenience Stores, Thornton
- Convention Consultants & Management, Thornton
- Convention Services - Other, Thornton
- Copying & Duplicating Services, Thornton
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