- Games & Hobbies, Madisonville
- Garage, Door & Window Products, Madisonville
- Garbage & Rubbish Removal, Madisonville
- Garment & Linen Services, Madisonville
- Gas Companies, Madisonville
- Gas Station, Madisonville - Service & Filling Station
- Gasoline, Madisonville
- General Business Services, Madisonville
- General Freight Trucking, Madisonville - Motor Freight
- General Merchandise Stores, Madisonville
- Generators, Compressors, Pumps, Motors & Fans, Madisonville
- Gift Shops, Madisonville - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Madisonville
- Glass & Glass Products, Madisonville
- Glass - Auto, Float, Plate, Window & Doors, Madisonville
- Golf Clubs Private, Madisonville
- Golf Courses, Madisonville
- Government, Madisonville
- Greeting Card Stores, Madisonville
- Grocery Stores & Supermarkets, Madisonville
- Ground Transportation, Except Passenger, Madisonville
- Gun Repair & Services, Madisonville
- Guns & Gunsmith Services, Madisonville
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