- Gas Station, Port Austin - Service & Filling Station
- General Business Consulting, Port Austin
- General Business Services, Port Austin
- General Consultants, Port Austin
- General Merchandise Stores, Port Austin
- Generators, Compressors, Pumps, Motors & Fans, Port Austin
- Gifts, Cards & Stationery Stores, Port Austin
- Glass & Glass Products, Port Austin
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- Glass - Auto, Float, Plate, Window & Doors, Port Austin
- Go Kart Tracks, Port Austin
- Golf Clubs Private, Port Austin
- Golf Courses, Port Austin
- Golf Lessons & Instruction, Port Austin
- Government, Port Austin
- Grocery Stores & Supermarkets, Port Austin
- Guest Houses & Ranches, Port Austin
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