- Games & Hobbies, Nantucket
- Garage, Door & Window Products, Nantucket
- Garbage & Rubbish Removal, Nantucket
- Garden & Lawn Sprinkler Repair, Installation & Service, Nantucket
- Garment & Linen Services, Nantucket
- Gas Engine, Nantucket
- Gas Station, Nantucket - Service & Filling Station
- Gemologists & Jewelers, Nantucket
- General Business Consulting, Nantucket
- General Business Services, Nantucket
- General Consultants, Nantucket
- General Freight Trucking, Nantucket - Motor Freight
- General Hardware Stores, Nantucket
- General Management Consulting Services, Nantucket - Management Consultants
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- General Merchandise Stores, Nantucket
- General Travel Agents & Agencies, Nantucket
- Gift Baskets, Nantucket
- Gifts By Type & Occasion, Nantucket
- Gifts Wholesale & Retail, Nantucket
- Gifts, Cards & Stationery Stores, Nantucket
- Golf Clubs Private, Nantucket
- Golf Courses, Nantucket
- Golf Equipment & Supplies Stores, Nantucket - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Food Stores, Nantucket
- Government, Nantucket
- Grocery Stores & Supermarkets, Nantucket
- Ground Transportation, Except Passenger, Nantucket
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