- Games & Hobbies, Winthrop
- Games Toys & Childrens Vehicles Manufacturers, Winthrop
- Garage Door Repair, Winthrop
- Garage, Door & Window Products, Winthrop
- Garbage & Rubbish Removal, Winthrop
- Garment & Linen Services, Winthrop
- Gas Appliance Repair, Maintenance & Service, Winthrop
- Gas Station, Winthrop - Service & Filling Station
- General Business Consulting, Winthrop
- General Business Services, Winthrop
- General Consultants, Winthrop
- General Freight Trucking, Winthrop - Motor Freight
- General Hardware Stores, Winthrop
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- General Management Consulting Services, Winthrop - Management Consultants
- General Merchandise Stores, Winthrop
- General Surgeons, Winthrop - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Winthrop
- Gifts, Cards & Stationery Stores, Winthrop
- Glass & Glass Products, Winthrop
- Glass - Auto, Float, Plate, Window & Doors, Winthrop
- Government, Winthrop
- Graffiti Removal & Protection Services, Winthrop
- Grocery Stores & Supermarkets, Winthrop
- Ground Transportation, Except Passenger, Winthrop
- Gymnastics Schools, Winthrop
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