- Cable TV Companies & Services, Dulles
- Cafe Restaurants, Dulles
- Camping Supplies & Equipment Stores, Dulles - Tents, Gear & Accessories
- Car Rental, Dulles - Rental Cars & Lease Service
- Cargo Containers, Dulles - Freight Containers
- Carpenters, Dulles - Carpentry Contractors
- Carpet, Rug & Linoleum Flooring Dealers, Dulles
- Casual Dining Restaurants, Dulles
- Cell & Mobile Installation Repairs, Dulles
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Dulles
- Cellular & Mobile Phone Service, Dulles
- Chimney & Fireplace Construction Contractors, Dulles - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Dulles - Fireplace - Chimney Sweep Services
- City & County Government, Dulles
- Clothing Stores, Dulles - Clothes & Accessories
- Coffee, Espresso & Tea House Restaurants, Dulles
- Colleges & Universities, Dulles
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- Communications Services, Dulles
- Community Services, Dulles
- Computer & Software Stores, Dulles
- Computer Repair, Dulles
- Computer Software & Services, Dulles
- Computer Software Service, Dulles
- Computer Stores, Dulles
- Computer Stores - Other, Dulles
- Construction, Dulles
- Construction Services, Dulles
- Consultants & Services, Dulles
- Contractors Equipment & Supplies Dealers Tools Pneumatic, Dulles
- Correspondence & Writing Schools, Dulles
- Cosmetics, Dulles
- Currency Exchanges, Dulles
- Cyber Cafes, Dulles
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