- Games & Hobbies, Johnstown
- Garage, Door & Window Products, Johnstown
- Garbage & Rubbish Removal, Johnstown
- Garment & Linen Services, Johnstown
- Garment Pressing & Cleaners Agents, Johnstown - Laundries & Dry Cleaners
- Gas Station, Johnstown - Service & Filling Station
- General Business Consulting, Johnstown
- General Business Services, Johnstown
- General Consultants, Johnstown
- General Hardware Stores, Johnstown
- General Management Consulting Services, Johnstown - Management Consultants
- General Merchandise Stores, Johnstown
- Generators, Compressors, Pumps, Motors & Fans, Johnstown
- Gift Shops, Johnstown - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Johnstown
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- Glass & Glass Products, Johnstown
- Glass - Auto, Float, Plate, Window & Doors, Johnstown
- Golf Clubs Private, Johnstown
- Golf Courses, Johnstown
- Golf Equipment & Supplies Stores, Johnstown - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Food Stores, Johnstown
- Government, Johnstown
- Government And Administration Attorneys & Lawyers, Johnstown
- Government And Administration Lawyers & Attorneys, Johnstown
- Grading Contractors, Johnstown - Excavating - Excavation Companies
- Graphic Design Services, Johnstown - Graphic Designer
- Graphic Designer & Artist Services, Johnstown
- Greeting Card Stores, Johnstown
- Grocery Stores & Supermarkets, Johnstown
- Ground Transportation, Except Passenger, Johnstown
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