- Garage, Door & Window Products, Stittsville
- Garment & Linen Services, Stittsville
- Gas Station, Stittsville - Service & Filling Station
- General Business Services, Stittsville
- General Management Consulting Services, Stittsville - Management Consultants
- General Merchandise Stores, Stittsville
- General Travel Agents & Agencies, Stittsville
- Generators, Compressors, Pumps, Motors & Fans, Stittsville
- Gift Shops, Stittsville - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Stittsville
- Glass & Fiber Glass Materials, Stittsville - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Stittsville
- Glass - Auto, Float, Plate, Window & Doors, Stittsville
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- Golf Courses, Stittsville
- Golf Driving Ranges, Stittsville
- Golf Tours, Stittsville
- Government, Stittsville
- Granite, Stittsville
- Graphic Design Services, Stittsville - Graphic Designer
- Graphic Designer & Artist Services, Stittsville
- Grocery Stores & Supermarkets, Stittsville
- Ground Transportation, Except Passenger, Stittsville
- Gun Repair & Services, Stittsville
- Guns & Gunsmith Services, Stittsville
- Gymnastic Clubs, Stittsville
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