- Games Toys & Childrens Vehicles Manufacturers, Duncannon
- Garbage & Rubbish Removal, Duncannon
- Garment & Linen Services, Duncannon
- Garment Pressing & Cleaners Agents, Duncannon - Laundries & Dry Cleaners
- Gas Station, Duncannon - Service & Filling Station
- General Business Services, Duncannon
- General Merchandise Stores, Duncannon
- Generators, Duncannon - Solar, Steam, Wind Power, etc
- Geothermal Heating & Cooling Equipment, Systems & Supplies, Duncannon
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- Gifts, Cards & Stationery Stores, Duncannon
- Government, Duncannon
- Graphic Design Services, Duncannon - Graphic Designer
- Graphic Designer & Artist Services, Duncannon
- Grocery Stores & Supermarkets, Duncannon
- Ground Transportation, Except Passenger, Duncannon
- Gun Repair & Services, Duncannon
- Guns & Gunsmith Services, Duncannon
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