- Gambling & Lottery Services, Ottawa
- Games & Hobbies, Ottawa
- Games Toys & Childrens Vehicles Manufacturers, Ottawa
- Garage Door Repair, Ottawa
- Garage Doors & Door Operating Devices, Ottawa
- Garage Doors & Gates, Ottawa - Stores & Companies - Install & Repair Services
- Garage Equipment & Accessories, Ottawa
- Garage, Door & Window Products, Ottawa
- Garages Auto Repairing Self Service, Ottawa
- Garbage & Rubbish Removal, Ottawa
- Garment & Linen Services, Ottawa
- Garment Pressing & Cleaners Agents, Ottawa - Laundries & Dry Cleaners
- Gas Appliance Repair, Maintenance & Service, Ottawa
- Gas Companies, Ottawa
- Gas Detection, Asbestos & Lead Contractors, Ottawa
- Gas Detectors & Analyzing, Ottawa
- Gas Equipment Industrial, Ottawa
- Gas Line Installation Contractors, Ottawa - Gas Pipe Installation - Repair Service
- Gas Pipe, Ottawa
- Gas Station, Ottawa - Service & Filling Station
- Gasket, Ottawa - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gastroenterologists, Ottawa - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gauges, Ottawa
- Gauges & Gages, Ottawa
- Gazebo Builders, Ottawa - Installation, Repair & Maintenance Services
- Gemologist, Ottawa
- Gemologists & Jewelers, Ottawa
- General Business Consulting, Ottawa
- General Business Services, Ottawa
- General Consultants, Ottawa
- General Freight Trucking, Ottawa - Motor Freight
- General Hardware Stores, Ottawa
- General Management Consultants & Services, Ottawa
- General Management Consulting Services, Ottawa - Management Consultants
- General Merchandise Stores, Ottawa
- General Travel Agents & Agencies, Ottawa
- Generator Rental & Leasing, Ottawa
- Generators, Ottawa - Solar, Steam, Wind Power, etc
- Generators, Compressors, Pumps, Motors & Fans, Ottawa
- Geographic & Geomatic Products, Ottawa
- Geographic & Geomatic Services, Ottawa
- Geosynthetics, Ottawa
- Geothermal Heating & Cooling Contractors, Ottawa - Geothermal HVAC - Installation
- German Restaurants, Ottawa
- Gift Baskets, Ottawa
- Gift Shops, Ottawa - Gift, Novelty & Souvenir Stores
- Gift Wrapping Materials, Ottawa
- Gifts By Type & Occasion, Ottawa
- Gifts Wholesale & Retail, 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 Art & Leaded, Ottawa
- Glass Decorative, Ottawa
- Glass Stained & Leaded, Ottawa
- Glass Tinting & Coating, Ottawa - Home - Car Window Tinting
- Glassware & Chinaware Repair, Ottawa
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Ottawa
- Golf Cars & Carts, Ottawa
- Golf Clubs Private, Ottawa
- Golf Courses, Ottawa
- Golf Driving Ranges, Ottawa
- Golf Equipment & Supplies Stores, Ottawa - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Equipment Repair & Sales, Ottawa - Clubs, Carts, Bags & More
- Golf Lessons & Instruction, Ottawa
- Golf Tours, Ottawa
- Goodyear Tires, Ottawa - Dealers
- Gospel Church, Ottawa
- Gourmet Food Stores, Ottawa
- Gourmet Restaurants, Ottawa
- Government, Ottawa
- Government And Administration Attorneys & Lawyers, Ottawa
- Government And Administration Attorneys & Lawyers, Ottawa
- Government And Administration Lawyers & Attorneys, Ottawa
- Government Contract & Relations Consultants, Ottawa
- Government Information & Offices Miscellaneous, Ottawa
- Gps Navigation Systems & Services, Ottawa
- Graffiti Removal & Protection Services, Ottawa
- Grain Elevators, Ottawa
- Granite, Ottawa
- Granite Counter Tops, Ottawa
- Graphic Design Services, Ottawa - Graphic Designer
- Graphic Designer & Artist Services, Ottawa
- Grease & Oil Disposal Sites, Ottawa
- Greek Churches, Ottawa
- Greek Restaurants, Ottawa
- Greeting Card Stores, Ottawa
- Grills & Grilling Equipment & Supplies, Ottawa
- Grocery Stores & Supermarkets, Ottawa
- Ground Transportation, Except Passenger, Ottawa
- Guide & Directory Advertising Services, Ottawa
- Gummed Tape, Ottawa
- Gun & Hunting & Fishing Clubs, Ottawa
- Gun Repair & Services, Ottawa
- Guns & Gunsmith Services, Ottawa
- Gutter & Flashing Contractors, Ottawa - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Centers, Ottawa
- Gymnastic Clubs, Ottawa
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