- Games & Hobbies, Duncanville
- Garage Door Repair, Duncanville
- Garage Doors & Door Operating Devices, Duncanville
- Garage Doors & Gates, Duncanville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Duncanville
- Garden & Lawn Sprinkler Repair, Installation & Service, Duncanville
- Garment & Linen Services, Duncanville
- Gas Station, Duncanville - Service & Filling Station
- Gate & Fence Repair, Duncanville
- General Business Consulting, Duncanville
- General Business Services, Duncanville
- General Consultants, Duncanville
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- General Hardware Stores, Duncanville
- General Management Consulting Services, Duncanville - Management Consultants
- General Merchandise Stores, Duncanville
- General Travel Agents & Agencies, Duncanville
- Gift Shops, Duncanville - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Duncanville
- Glass & Glass Products, Duncanville
- Glass Plate Windows, Duncanville
- Government, Duncanville
- Grocery Stores & Supermarkets, Duncanville
- Ground Transportation, Except Passenger, Duncanville
- Guide & Directory Advertising Services, Duncanville
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