- Cabinets & Cabinet Hardware, Poolesville
- Cafe Restaurants, Poolesville
- Campgrounds, Poolesville
- Cars, Truck, Van & SUV Car Dealerships, Poolesville - Auto Dealers
- Casual Dining Restaurants, Poolesville
- Catholic Churches, Poolesville
- Central American Restaurants, Poolesville
- Chambers Of Commerce, Poolesville
- Child Care & Day Care Services, Poolesville
- Child Related Social Services, Poolesville
- Chimney Cleaning & Repair, Poolesville - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Poolesville
- Christian Churches, Poolesville
- Churches 1 Of 3, Poolesville
- City & County Administrative Agencies, Poolesville
- City & County Government, Poolesville
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- Clinics, Poolesville
- Community & Recreational Facilities, Poolesville
- Community Services, Poolesville
- Computer & Laptop Repair, Poolesville - PC Repair Services
- Computer & Software Stores, Poolesville
- Computer Graphics, Poolesville
- Computer Graphics Services, Poolesville
- Computer Repair, Poolesville
- Computer Security Services & Equipment, Poolesville
- Computer Services, Poolesville
- Computer Software & Services, Poolesville
- Computer Software Service, Poolesville
- Concrete Contractors, Poolesville - Concrete Construction & Concrete Companies
- Construction, Poolesville
- Consultants & Services, Poolesville
- Craft Supplies, Poolesville - Hobby & Craft Stores
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