- Games & Hobbies, Duncansville
- Garage Door Repair, Duncansville
- Garage Doors & Door Operating Devices, Duncansville
- Garage Doors & Gates, Duncansville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Duncansville
- Garbage & Rubbish Removal, Duncansville
- Garment & Linen Services, Duncansville
- Gas Station, Duncansville - Service & Filling Station
- General Business Consulting, Duncansville
- General Business Services, Duncansville
- General Consultants, Duncansville
- General Freight Trucking, Duncansville - Motor Freight
- General Hardware Stores, Duncansville
- General Management Consulting Services, Duncansville - Management Consultants
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- General Merchandise Stores, Duncansville
- General Travel Agents & Agencies, Duncansville
- Generators, Compressors, Pumps, Motors & Fans, Duncansville
- Gift Baskets, Duncansville
- Gifts By Type & Occasion, Duncansville
- Gifts, Cards & Stationery Stores, Duncansville
- Glass & Glass Products, Duncansville
- Glass & Glazing Contractors, Duncansville
- Glass - Auto, Float, Plate, Window & Doors, Duncansville
- Glass Tinting & Coating, Duncansville - Home - Car Window Tinting
- Government, Duncansville
- Grace Brethren, Duncansville
- Grocery Stores & Supermarkets, Duncansville
- Ground Transportation, Except Passenger, Duncansville
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