- Tariff Bureaus, Reston
- Tax Return Preparation, Reston
- Tax Services, Reston
- Taxi Cab Service, Reston
- Taxi Service, Reston
- Technical Consultants, Reston
- Technological Research & Development, Reston
- Technology Transfer Consultants, Reston
- Teeth Whitening Products, Reston
- Teeth Whitening Products & Services, Reston
- Telecommunications, Reston
- Telecommunications Companies, Businesses & Services, Reston
- Telecommunications Consultants, Reston
- Teleconference Service, Equipment & Systems, Reston
- Telephone Answering Service, Reston - Messenger Services
- Telephone Communication Service & Phone Companies, Reston - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, Reston - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Reston - Telecommunication Services
- Temp Agencies, Reston
- Temporary & Contractor Agencies, Reston
- Testing Laboratories, Reston - Lab Tests
- Thai Restaurants, Reston
- Theater & Sport Ticket Agencies, Reston
- Theatrical Producers & Services, Reston
- Theme & Entertainment Restaurants, Reston
- Therapeutic Massage Clinics, Reston - Massage Therapy Centers
- Thoracic Surgeons, Reston - Thoracic Surgery Doctors & Physicians
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- Thrift Stores, Resale & Consignment Shops, Reston
- Tile & Mosaics, Reston - Manufacturers & Distributors
- Tires - Wholesale & Retail, Reston
- Title & Surety Insurance, Reston
- Title Companies, Reston - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Reston
- Towing Service, Reston
- Toy Stores, Reston
- Trademark Development & Searching, Reston
- Training & Seminars - Program Designing & Development, Reston
- Training Consultants, Reston
- Training Programs Designing & Development, Reston - Training Consultants
- Transcription Services, Reston
- Translators & Interpreters, Reston
- Transplant Services, Reston
- Transportation, Reston
- Transportation & Traffic Consultants & Services, Reston - Transportation Brokers & Consultants
- Transportation Facilities & Services, Reston
- Transportation Repair & Maintenance, Reston
- Travel & Tourism, Reston
- Travel Arrangement & Services, Reston
- Travel Assistance Organizations, Reston
- Truck Rental & Leasing, Reston - Rent a Truck & Tractor
- Truck Repair & Service, Reston
- Tutoring Instructor, Reston
- TV Stations & Broadcasting Companies, Reston - Cable TV Networks, Talk Shows, etc
- Typing & Word Processing Services, Reston
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