- Games & Hobbies, Dayton
- Garage Doors & Door Operating Devices, Dayton
- Garage Doors & Gates, Dayton - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Dayton
- Garment & Linen Services, Dayton
- Gas Equipment Industrial, Dayton
- Gas Station, Dayton - Service & Filling Station
- General Business Consulting, Dayton
- General Business Services, Dayton
- General Consultants, Dayton
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- General Freight Trucking, Dayton - Motor Freight
- General Management Consulting Services, Dayton - Management Consultants
- General Merchandise Stores, Dayton
- General Travel Agents & Agencies, Dayton
- Gifts, Cards & Stationery Stores, Dayton
- Glass & Fiber Glass Materials, Dayton - Wholesale, Manufacturers & Suppliers
- Government, Dayton
- Grocery Stores & Supermarkets, Dayton
- Ground Transportation, Except Passenger, Dayton
- Gymnastics Schools, Dayton
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