- Cabinets & Cabinet Hardware, Reston
- Cable TV Companies & Services, Reston
- Cafe Restaurants, Reston
- Campgrounds, Reston
- Cancer Clinics, Reston - Cancer Treatment Centers
- Caps Hats & Head Wear Manufacturers, Reston
- Car Tune Up Service, Reston - Auto Tune Up
- Cardiologists, Reston - Heart Doctors, Physicians & Surgeons (Cardiology)
- Cargo Containers, Reston - Freight Containers
- Carpenters, Reston - Carpentry Contractors
- Carpet & Rug Cleaners Water Extraction & Restoration, Reston
- Carpet Rug & Upholstery Cleaners, Reston
- Carpet, Rug & Linoleum Flooring Dealers, Reston
- Casual Dining Restaurants, Reston
- Catalog Compilers, Reston
- Catalog Designers & Compilers, Reston
- Catalog Services, Reston
- Caterers Food Services, Reston
- Catholic Churches, Reston
- Cell & Mobile Installation Repairs, Reston
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Reston
- Cellular & Mobile Phone Service, Reston
- Cellular & Wireless Telephones Rental & Leasing, Reston
- Central American Restaurants, Reston
- Chambers Of Commerce, Reston
- Charitable & Non-Profit Organizations, Reston
- Chicken Restaurants, Reston
- Child Care & Day Care Services, Reston
- Child Related Social Services, Reston
- Children's Clothing Stores, Reston - Infant, Babies & Kids Clothing
- Childrens After School Programs, Reston
- China Crystal & Glassware Decorations Stores, Reston
- Chinese Restaurants, Reston
- Chiropractor, Reston
- Chocolate & Cocoa, Reston
- Christian Churches, Reston
- Church Of Jesus Christ Of Latter Day Saints, Reston
- Churches 1 Of 3, Reston
- Churches 2 Of 3, Reston
- Churches 3 Of 3, Reston
- Churches Christian Science, Reston
- Cigar, Cigarette & Tobacco Store & Supplies, Reston
- City & County Administrative Agencies, Reston
- City & County Government, Reston
- City & County Law Enforcement, Reston
- Cleaning & Maintenance Services, Reston
- Cleaning & Restoration Contractors, Including Sandblasting, Reston
- Clinics, Reston
- Clothing Stores, Reston - Clothes & Accessories
- Coffee, Reston
- Coffee & Tea Stores, Reston
- Coffee, Espresso & Tea House Restaurants, Reston
- Collectibles, Reston
- Collection Agency Services, Reston
- Colleges & Universities, Reston
- Commercial & Literacy Writings, Reston
- Commercial Equipment, Reston
- Commercial Printing Manufacturers, Reston
- Commercial, Industrial & Office Space for Rent & Lease, Reston
- Communication Equipment & Systems, Reston
- Communications Consultants, Reston
- Communications Contractors, Reston
- Communications Services, Reston
- Communications Systems & Equipment Rental & Leasing, Reston
- Community & Recreational Facilities, Reston
- Community Centers, Reston
- Community Church, Reston
- Community Churches, Reston
- Community Services, Reston
- Computer & Audio Visual Services, Reston
- Computer & Data Services, Reston
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- Computer & Laptop Repair, Reston - PC Repair Services
- Computer & Software Stores, Reston
- Computer Aided Design Systems & Services, Reston - CAD
- Computer Applications Networking Systems, Reston
- Computer Database Service, Reston
- Computer Graphics, Reston
- Computer Graphics Services, Reston
- Computer Manufacturers, Reston
- Computer Networks, Reston - Design & Systems
- Computer Programming & Software Development Services, Reston
- Computer Repair, Reston
- Computer Security Services & Equipment, Reston
- Computer Services, Reston
- Computer Software & Services, Reston
- Computer Software & Services Business, Reston
- Computer Software & Services Network Solutions, Reston
- Computer Software Development, Reston
- Computer Software Service, Reston
- Computer Stores, Reston
- Computer Stores - Other, Reston
- Computer Supplies, Parts, Equipments & Accessories, Reston
- Computer Support & Help Services, Reston
- Computer System Consultants, Reston - IT Consulting Services
- Computer System Designer & Consultant, Reston
- Computer System Designers & Consultants, Reston
- Computer Technical Assistance & Support Services, Reston - Tech Support Service
- Computer Training Schools, Reston
- Computers Software & Services Security, Reston
- Concrete Contractors, Reston - Concrete Construction & Concrete Companies
- Condiments & Sauces, Reston
- Condominiums & Townhomes for Rent, Reston - Townhouses & Condos for Rent & Lease
- Construction, Reston
- Construction & Civil Engineer, Reston
- Construction Companies, Reston
- Construction Machinery, Reston - Mining Machinery
- Construction Services, Reston
- Consultants & Services, Reston
- Consultants Referral Service, Reston
- Consulting Services, Reston - Internet Consultants
- Contractor Equipment & Supplies, Reston - Construction Equipment & Machinery
- Control Systems & Regulators, Reston
- Convalescent Homes Placement Services, Reston - Convalescent Care
- Convenience Stores, Reston
- Convention & Corporate Accommodations, Reston
- Convention Services - Other, Reston
- Cooling System & Parts, Reston - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copying & Duplicating Services, Reston
- Copyright, Patent & Trademark Attorneys & Lawyers, Reston
- Copyright, Patent & Trademark Attorneys & Lawyers, Reston
- Copyright, Patent & Trademark Lawyers & Attorneys, Reston
- Corporate Attorneys & Lawyers, Reston
- Corporate Business Attorneys & Lawyers, Reston
- Corporate Employees Health Programs, Reston
- Corporate Lawyers & Attorneys, Reston
- Cosmetics, Reston
- Cosmetics & Perfumes Outlets, Reston
- Counseling Services, Reston
- Country Clubs, Reston
- County Police, Reston
- Covenant Churches, Reston
- Craft Supplies, Reston - Hobby & Craft Stores
- Credit Card & Plans - Machines, Equipment & Supplies , Reston - Terminal Systems
- Credit Card Merchant Services, Reston
- Credit Card Plan Services, Reston
- Credit Reporting Agencies, Reston
- Credit Unions, Reston
- Cruise Agents, Reston - Travel Agents
- Cruise Lines, Reston - Cruises
- Custom Sewing & Alterations, Reston
- Customer Service Representatives, Reston
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