- Gambling & Lottery Services, Cornwall
- Games & Hobbies, Cornwall
- Games Toys & Childrens Vehicles Manufacturers, Cornwall
- Garage Doors & Door Operating Devices, Cornwall
- Garage Doors & Gates, Cornwall - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Cornwall
- Garbage & Rubbish Removal, Cornwall
- Garment & Linen Services, Cornwall
- Gas & Other Services Combined, Cornwall
- Gas Companies, Cornwall
- Gas Equipment Industrial, Cornwall
- Gas Station, Cornwall - Service & Filling Station
- Genealogy, Cornwall
- General Business Consulting, Cornwall
- General Business Services, Cornwall
- General Consultants, Cornwall
- General Freight Trucking, Cornwall - Motor Freight
- General Hardware Stores, Cornwall
- General Management Consulting Services, Cornwall - Management Consultants
- General Merchandise Stores, Cornwall
- General Travel Agents & Agencies, Cornwall
- Generators, Compressors, Pumps, Motors & Fans, Cornwall
- Geothermal Heating & Cooling Contractors, Cornwall - Geothermal HVAC - Installation
- Gift Baskets, Cornwall
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- Gift Shops, Cornwall - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Cornwall
- Gifts, Cards & Stationery Stores, Cornwall
- Glass & Glass Products, Cornwall
- Glass & Glazing Contractors, Cornwall
- Glass - Auto, Float, Plate, Window & Doors, Cornwall
- Glass Tinting & Coating, Cornwall - Home - Car Window Tinting
- Golf Clubs Private, Cornwall
- Golf Courses, Cornwall
- Golf Driving Ranges, Cornwall
- Goodyear Tires, Cornwall - Dealers
- Gourmet Food Stores, Cornwall
- Government, Cornwall
- Graphic Design Services, Cornwall - Graphic Designer
- Graphic Designer & Artist Services, Cornwall
- Greeting Card Stores, Cornwall
- Grocery Stores & Supermarkets, Cornwall
- Ground Transportation, Except Passenger, Cornwall
- Guide & Directory Advertising Services, Cornwall
- Gummed Tape, Cornwall
- Gun Repair & Services, Cornwall
- Guns & Gunsmith Services, Cornwall
- Gutter & Flashing Contractors, Cornwall - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, Cornwall
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