- Garbage & Rubbish Removal, Smithville
- Garden & Lawn Sprinkler Repair, Installation & Service, Smithville
- Garment & Linen Services, Smithville
- Gas Equipment Industrial, Smithville
- Gas Station, Smithville - Service & Filling Station
- Gasoline, Smithville
- General Business Services, Smithville
- General Freight Trucking, Smithville - Motor Freight
- General Merchandise Stores, Smithville
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- Golf Courses, Smithville
- Golf Equipment & Supplies Stores, Smithville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Tournament Planning, Smithville
- Government, Smithville
- Grape Vineyards, Smithville
- Grocery Stores & Supermarkets, Smithville
- Ground Transportation, Except Passenger, Smithville
- Gymnastics Schools, Smithville
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