- Garment & Linen Services, Johnstown
- Gas Companies, Johnstown
- Gas Station, Johnstown - Service & Filling Station
- General Business Consulting, Johnstown
- General Business Services, Johnstown
- General Consultants, Johnstown
- General Freight Trucking, Johnstown - Motor Freight
- General Merchandise Stores, Johnstown
- Generators, Compressors, Pumps, Motors & Fans, Johnstown
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- Gifts, Cards & Stationery Stores, Johnstown
- Golf Courses, Johnstown
- Golf Driving Ranges, Johnstown
- Golf Equipment & Supplies Stores, Johnstown - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Johnstown
- Government, Johnstown
- Grocery Stores & Supermarkets, Johnstown
- Ground Transportation, Except Passenger, Johnstown
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