- Games & Hobbies, Reston
- Garage Door Repair, Reston
- Garage Doors & Door Operating Devices, Reston
- Garage Doors & Gates, Reston - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Reston
- Garment & Linen Services, Reston
- Gas Companies, Reston
- Gas Station, Reston - Service & Filling Station
- Gemologists & Jewelers, Reston
- General Business Consulting, Reston
- General Business Services, Reston
- General Consultants, Reston
- General Freight Trucking, Reston - Motor Freight
- General Hardware Stores, Reston
- General Management Consulting Services, Reston - Management Consultants
- General Merchandise Stores, Reston
- General Surgeons, Reston - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Reston
- Geotechnical Engineer, Reston
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- Gift Baskets, Reston
- Gift Certificates, Reston
- Gift Shops, Reston - Gift, Novelty & Souvenir Stores
- Gift Wrapping Service, Reston
- Gifts By Type & Occasion, Reston
- Gifts, Cards & Stationery Stores, Reston
- Glass & Glass Products, Reston
- Glass Block & Architectural, Reston
- Golf Courses, Reston
- Government, Reston
- Government Information & Offices Miscellaneous, Reston
- Graphic Design Services, Reston - Graphic Designer
- Graphic Designer & Artist Services, Reston
- Greek Churches, Reston
- Greeting Card Stores, Reston
- Grocery Stores & Supermarkets, Reston
- Ground Transportation, Except Passenger, Reston
- Group Homes, Reston
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