- Games & Hobbies, Clarkston
- Garbage & Rubbish Removal, Clarkston
- Garment & Linen Services, Clarkston
- Gas Engine, Clarkston
- Gas Equipment Industrial, Clarkston
- General Business Services, Clarkston
- General Freight Trucking, Clarkston - Motor Freight
- General Hardware Stores, Clarkston
- General Management Consulting Services, Clarkston - Management Consultants
- General Merchandise Stores, Clarkston
- General Surgeons, Clarkston - General Surgery Doctors, Physicians & Surgeons
- Gifts, Cards & Stationery Stores, Clarkston
- Glass & Glass Products, Clarkston
- Glass - Auto, Float, Plate, Window & Doors, Clarkston
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- Golf Courses, Clarkston
- Golf Equipment Repair & Sales, Clarkston - Clubs, Carts, Bags & More
- Golf Lessons & Instruction, Clarkston
- Gourmet Food Stores, Clarkston
- Government, Clarkston
- Grain Elevators, Clarkston
- Graphic Design Services, Clarkston - Graphic Designer
- Graphic Designer & Artist Services, Clarkston
- Green - Landscape Contractors, Clarkston
- Greeting Card Stores, Clarkston
- Grocery Stores & Supermarkets, Clarkston
- Ground Transportation, Except Passenger, Clarkston
- Gymnastics Schools, Clarkston
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