- Cabins Cottages & Chalet Rental, Duffield
- Cable TV Companies & Services, Duffield
- Chemicals & Related Products, Duffield
- Child Care & Day Care Services, Duffield
- Churches 1 Of 3, Duffield
- City & County Government, Duffield
- Cleaning & Maintenance Services, Duffield
- Clinics, Duffield
- Clothing Stores, Duffield - Clothes & Accessories
- Combustibles & Explosives, Duffield
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- Commercial Equipment, Duffield
- Communications Services, Duffield
- Community Church, Duffield
- Community Churches, Duffield
- Community Services, Duffield
- Computer & Audio Visual Services, Duffield
- Construction, Duffield
- Construction Machinery, Duffield - Mining Machinery
- Convenience Stores, Duffield
- Credit Unions, Duffield
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