- Garage Door Repair, Clarkston
- Garment & Linen Services, Clarkston
- Gas Station, Clarkston - Service & Filling Station
- General Business Consulting, Clarkston
- General Business Services, Clarkston
- General Consultants, Clarkston
- General Merchandise Stores, Clarkston
- Gift Shops, Clarkston - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Clarkston
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- Glass & Glass Products, Clarkston
- Glass - Auto, Float, Plate, Window & Doors, Clarkston
- Glass Giftware, Clarkston
- Government, Clarkston
- Graphic Design Services, Clarkston - Graphic Designer
- Graphic Designer & Artist Services, Clarkston
- Grocery Stores & Supermarkets, Clarkston
- Ground Transportation, Except Passenger, Clarkston
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