- Car Rental, Clarkson - Rental Cars & Lease Service
- Carpenters, Clarkson - Carpentry Contractors
- Carpet, Rug & Linoleum Flooring Dealers, Clarkson
- Caterers Food Services, Clarkson
- Chemical Compounds, Clarkson
- Chemicals & Related Products, Clarkson
- Child Care & Day Care Services, Clarkson
- Children's Clothing Stores, Clarkson - Infant, Babies & Kids Clothing
- Chiropractic Clinics, Clarkson
- Chocolate & Cocoa, Clarkson
- Churches 1 Of 3, Clarkson
- Cleaning & Maintenance Services, Clarkson
- Clinics, Clarkson
- Clothing Stores, Clarkson - Clothes & Accessories
- Commercial Printing Manufacturers, Clarkson
- Community Services, Clarkson
- Computer & Audio Visual Services, Clarkson
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- Computer & Laptop Repair, Clarkson - PC Repair Services
- Computer & Software Stores, Clarkson
- Computer Networks, Clarkson - Design & Systems
- Computer Repair, Clarkson
- Computer Software & Services, Clarkson
- Computer Software Publishers & Developers, Clarkson
- Concrete Contractors, Clarkson - Concrete Construction & Concrete Companies
- Construction, Clarkson
- Construction Companies, Clarkson
- Construction Services, Clarkson
- Consultants & Services, Clarkson
- Control Systems & Regulators, Clarkson
- Convenience Stores, Clarkson
- Cosmetics & Perfumes Outlets, Clarkson
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Clarkson
- Cremation Services, Supplies & Equipment, Clarkson
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