- Games & Hobbies, Lorton
- Garage Door Repair, Lorton
- Garage Doors & Door Operating Devices, Lorton
- Garage Doors & Gates, Lorton - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Lorton
- Garbage & Rubbish Removal, Lorton
- Garment & Linen Services, Lorton
- Gas & Air Compressors, Lorton
- Gas Companies, Lorton
- Gas Station, Lorton - Service & Filling Station
- General Business Consulting, Lorton
- General Business Services, Lorton
- General Consultants, Lorton
- General Freight Trucking, Lorton - Motor Freight
- General Management Consulting Services, Lorton - Management Consultants
- General Merchandise Stores, Lorton
- General Surgeons, Lorton - General Surgery Doctors, Physicians & Surgeons
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- General Travel Agents & Agencies, Lorton
- Generators, Compressors, Pumps, Motors & Fans, Lorton
- Gifts, Cards & Stationery Stores, Lorton
- Glass & Glass Products, Lorton
- Glass - Auto, Float, Plate, Window & Doors, Lorton
- Glassware Retail, Lorton
- Golf Courses, Lorton
- Government, Lorton
- Government Information & Offices Miscellaneous, Lorton
- Granite, Lorton
- Greek Restaurants, Lorton
- Grocery Stores & Supermarkets, Lorton
- Ground Transportation, Except Passenger, Lorton
- Guide & Directory Advertising Services, Lorton
- Gun Repair & Services, Lorton
- Guns & Gunsmith Services, Lorton
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