- Games & Hobbies, Cornwall
- Garment & Linen Services, Cornwall
- Gemologist, Cornwall
- General Business Services, Cornwall
- General Management Consulting Services, Cornwall - Management Consultants
- General Merchandise Stores, Cornwall
- Gift Shops, Cornwall - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Cornwall
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- Glass & Glass Products, Cornwall
- Glass - Auto, Float, Plate, Window & Doors, Cornwall
- Golf Clubs Private, Cornwall
- Golf Courses, Cornwall
- Government, Cornwall
- Grocery Stores & Supermarkets, Cornwall
- Ground Transportation, Except Passenger, Cornwall
- Gymnastics Schools, Cornwall
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