- Garbage & Rubbish Removal, Lewistown
- Garment & Linen Services, Lewistown
- Gas Companies, Lewistown
- Gas Detection, Asbestos & Lead Contractors, Lewistown
- Gas Equipment Industrial, Lewistown
- Gas Station, Lewistown - Service & Filling Station
- General Business Consulting, Lewistown
- General Business Services, Lewistown
- General Consultants, Lewistown
- General Freight Trucking, Lewistown - Motor Freight
- General Hardware Stores, Lewistown
- General Merchandise Stores, Lewistown
- General Travel Agents & Agencies, Lewistown
- Generators, Compressors, Pumps, Motors & Fans, Lewistown
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- Gifts, Cards & Stationery Stores, Lewistown
- Glass & Glass Products, Lewistown
- Glass - Auto, Float, Plate, Window & Doors, Lewistown
- Golf Courses, Lewistown
- Golf Equipment & Supplies Stores, Lewistown - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Equipment Repair & Sales, Lewistown - Clubs, Carts, Bags & More
- Gourmet Food Stores, Lewistown
- Government, Lewistown
- Grain Elevators, Lewistown
- Graphic Design Services, Lewistown - Graphic Designer
- Graphic Designer & Artist Services, Lewistown
- Grocery Stores & Supermarkets, Lewistown
- Ground Transportation, Except Passenger, Lewistown
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