- Garage Doors & Door Operating Devices, Duncan
- Garage Doors & Gates, Duncan - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Duncan
- Garbage & Rubbish Removal, Duncan
- Garment & Linen Services, Duncan
- Gasket, Duncan - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gastroenterologists, Duncan - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Duncan
- General Business Services, Duncan
- General Consultants, Duncan
- General Freight Trucking, Duncan - Motor Freight
- General Management Consulting Services, Duncan - Management Consultants
- General Merchandise Stores, Duncan
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- Gifts, Cards & Stationery Stores, Duncan
- Glass & Glass Products, Duncan
- Glass - Auto, Float, Plate, Window & Doors, Duncan
- Glass, Plastic & Rubber Working Machinery, Duncan
- Golf Courses, Duncan
- Gourmet Restaurants, Duncan
- Government, Duncan
- Government Contract & Relations Consultants, Duncan
- Government Information & Offices Miscellaneous, Duncan
- Grading Contractors, Duncan - Excavating - Excavation Companies
- Grocery Stores & Supermarkets, Duncan
- Ground Transportation, Except Passenger, Duncan
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