- Games & Hobbies, Johnstown
- Garage Building & Repair, Johnstown - Carports - Garage Builders
- Garage Door Repair, Johnstown
- Garage Doors & Door Operating Devices, Johnstown
- Garage Doors & Gates, Johnstown - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Johnstown
- Garbage & Rubbish Removal, Johnstown
- Garment & Linen Services, Johnstown
- Gas Companies, Johnstown
- Gas Equipment Industrial, Johnstown
- Gas Station, Johnstown - Service & Filling Station
- Gastroenterologists, Johnstown - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Johnstown
- General Business Consulting, Johnstown
- General Business Services, Johnstown
- General Consultants, Johnstown
- General Freight Trucking, Johnstown - Motor Freight
- General Hardware Stores, Johnstown
- General Management Consulting Services, Johnstown - Management Consultants
- General Merchandise Stores, Johnstown
- General Surgeons, Johnstown - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Johnstown
- Generators, Compressors, Pumps, Motors & Fans, Johnstown
- Gift Baskets, Johnstown
- Gift Shops, Johnstown - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Johnstown
- Gifts, Cards & Stationery Stores, Johnstown
- Glass & Glass Products, Johnstown
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- Glass - Auto, Float, Plate, Window & Doors, Johnstown
- Glass Block & Architectural, Johnstown
- Glass Plate Windows, Johnstown
- Glass Stained & Leaded, Johnstown
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Johnstown
- Golf Clubs Private, Johnstown
- Golf Courses, Johnstown
- Golf Driving Ranges, Johnstown
- Golf Equipment & Supplies Stores, Johnstown - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gospel Church, Johnstown
- Government, Johnstown
- Government And Administration Attorneys & Lawyers, Johnstown
- Government And Administration Attorneys & Lawyers, Johnstown
- Government And Administration Lawyers & Attorneys, Johnstown
- Government Contract & Relations Consultants, Johnstown
- Government Information & Offices Miscellaneous, Johnstown
- Graphic Design Services, Johnstown - Graphic Designer
- Graphic Designer & Artist Services, Johnstown
- Gray & Ductile Iron Foundries, Johnstown
- Greek Churches, Johnstown
- Greeting Card Stores, Johnstown
- Grinding Services, Johnstown
- Grocery Stores & Supermarkets, Johnstown
- Ground Transportation, Except Passenger, Johnstown
- Guide & Directory Advertising Services, Johnstown
- Gun & Hunting & Fishing Clubs, Johnstown
- Gutters & Downspout Cleaning & Repairing, Johnstown
- Gymnastics Schools, Johnstown
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