- Games & Hobbies, Ottawa
- Garage Door Repair, Ottawa
- Garage Doors & Door Operating Devices, Ottawa
- Garage Doors & Gates, Ottawa - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Ottawa
- Garbage & Rubbish Removal, Ottawa
- Garment & Linen Services, Ottawa
- Gas Station, Ottawa - Service & Filling Station
- Gasoline, Ottawa
- General Business Services, Ottawa
- General Freight Trucking, Ottawa - Motor Freight
- General Merchandise Stores, Ottawa
- General Travel Agents & Agencies, Ottawa
- Generators, Compressors, Pumps, Motors & Fans, Ottawa
- Gifts By Type & Occasion, Ottawa
- Gifts, Cards & Stationery Stores, Ottawa
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- Glass & Glass Products, Ottawa
- Glass & Glazing Contractors, Ottawa
- Glass - Auto, Float, Plate, Window & Doors, Ottawa
- Glass Tinting & Coating, Ottawa - Home - Car Window Tinting
- Golf Courses, Ottawa
- Gourmet Restaurants, Ottawa
- Government, Ottawa
- Grain Elevators, Ottawa
- Granite, Ottawa
- Graphic Design Services, Ottawa - Graphic Designer
- Graphic Designer & Artist Services, Ottawa
- Greek Restaurants, Ottawa
- Grocery Stores & Supermarkets, Ottawa
- Ground Transportation, Except Passenger, Ottawa
- Gutters & Downspout Cleaning & Repairing, Ottawa
- Gymnastics Schools, Ottawa
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