- 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 Station, Dayton - Service & Filling Station
- Gasket, Dayton - Supply & Wholesale - Gaskets, Packing & Sealing Device
- General Business Consulting, Dayton
- General Business Services, Dayton
- General Consultants, Dayton
- General Management Consulting Services, Dayton - Management Consultants
- General Merchandise Stores, Dayton
- General Travel Agents & Agencies, Dayton
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- Generators, Compressors, Pumps, Motors & Fans, Dayton
- Glass & Glass Products, Dayton
- Glass Stained & Leaded, Dayton
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Dayton
- Golf Associations, Dayton
- Golf Courses, Dayton
- Government, Dayton
- Green - Landscape Contractors, Dayton
- Grocery Stores & Supermarkets, Dayton
- Ground Transportation, Except Passenger, Dayton
- Gun Repair & Services, Dayton
- Guns & Gunsmith Services, Dayton
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