- Garage, Door & Window Products, Ottawa
- Garment & Linen Services, Ottawa
- Gas Engine, Ottawa
- Gas Station, Ottawa - Service & Filling Station
- General Business Services, Ottawa
- General Hardware Stores, Ottawa
- General Management Consulting Services, Ottawa - Management Consultants
- General Merchandise Stores, Ottawa
- General Travel Agents & Agencies, Ottawa
- Gift Shops, Ottawa - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Ottawa
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- Golf Clubs Private, Ottawa
- Golf Courses, Ottawa
- Government, Ottawa
- Grain Elevators, Ottawa
- Greeting Card Stores, Ottawa
- Grocery Stores & Supermarkets, Ottawa
- Ground Transportation, Except Passenger, Ottawa
- Gun Repair & Services, Ottawa
- Guns & Gunsmith Services, Ottawa
- Gymnastics Schools, Ottawa
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