- Garment & Linen Services, Hennessey
- Gas Companies, Hennessey
- Gas Engine, Hennessey
- Gas Measurement Service, Hennessey
- Gas Station, Hennessey - Service & Filling Station
- General Business Services, Hennessey
- General Merchandise Stores, Hennessey
- Generators, Compressors, Pumps, Motors & Fans, Hennessey
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- Gifts, Cards & Stationery Stores, Hennessey
- Glass & Glass Products, Hennessey
- Glass - Auto, Float, Plate, Window & Doors, Hennessey
- Golf Courses, Hennessey
- Government, Hennessey
- Grain Elevators, Hennessey
- Grocery Stores & Supermarkets, Hennessey
- Ground Transportation, Except Passenger, Hennessey
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