- Games & Hobbies, Maineville
- Garage, Door & Window Products, Maineville
- Garment & Linen Services, Maineville
- Gas Station, Maineville - Service & Filling Station
- General Business Services, Maineville
- General Freight Trucking, Maineville - Motor Freight
- General Hardware Stores, Maineville
- General Merchandise Stores, Maineville
- Gift Baskets, Maineville
- Gifts By Type & Occasion, Maineville
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- Gifts, Cards & Stationery Stores, Maineville
- Glass & Glass Products, Maineville
- Glass Block & Architectural, Maineville
- Golf Course Management, Maineville
- Golf Courses, Maineville
- Golf Equipment & Supplies Stores, Maineville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Maineville
- Grocery Stores & Supermarkets, Maineville
- Ground Transportation, Except Passenger, Maineville
- Gutters & Downspout Cleaning & Repairing, Maineville
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