- Games & Hobbies, Williamsport
- Garage Building & Repair, Williamsport - Carports - Garage Builders
- Garage Door Repair, Williamsport
- Garage Doors & Door Operating Devices, Williamsport
- Garage Doors & Gates, Williamsport - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Williamsport
- Garbage & Rubbish Removal, Williamsport
- Garment & Linen Services, Williamsport
- Gas & Air Compressors, Williamsport
- Gas Companies, Williamsport
- Gas Engine, Williamsport
- Gas Equipment Industrial, Williamsport
- Gas Station, Williamsport - Service & Filling Station
- Gasket, Williamsport - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gasoline, Williamsport
- Gastroenterologists, Williamsport - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Williamsport
- General Business Consulting, Williamsport
- General Business Services, Williamsport
- General Consultants, Williamsport
- General Freight Trucking, Williamsport - Motor Freight
- General Hardware Stores, Williamsport
- General Management Consulting Services, Williamsport - Management Consultants
- General Merchandise Stores, Williamsport
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- General Surgeons, Williamsport - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Williamsport
- Generators, Compressors, Pumps, Motors & Fans, Williamsport
- Gift Baskets, Williamsport
- Gift Shops, Williamsport - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Williamsport
- Gifts, Cards & Stationery Stores, Williamsport
- Glass & Glass Products, Williamsport
- Glass - Auto, Float, Plate, Window & Doors, Williamsport
- Glass - Beveled, Carved, Etched & Ornamental, Williamsport
- Glass Stained & Leaded, Williamsport
- Glass, Plastic & Rubber Working Machinery, Williamsport
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Williamsport
- Government, Williamsport
- Granite, Williamsport
- Graphic Design Services, Williamsport - Graphic Designer
- Graphic Designer & Artist Services, Williamsport
- Grills & Grilling Equipment & Supplies, Williamsport
- Grocery Stores & Supermarkets, Williamsport
- Ground Transportation, Except Passenger, Williamsport
- Gummed Tape, Williamsport
- Gun Repair & Services, Williamsport
- Guns & Gunsmith Services, Williamsport
- Gutters & Downspout Cleaning & Repairing, Williamsport
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