- Games & Hobbies, Southold
- Garage Doors & Door Operating Devices, Southold
- Garage Doors & Gates, Southold - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Southold
- Garden & Lawn Sprinkler Repair, Installation & Service, Southold
- Gas Engine, Southold
- Gas Station, Southold - Service & Filling Station
- General Business Services, Southold
- General Hardware Stores, Southold
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- General Merchandise Stores, Southold
- Gift Baskets, Southold
- Gifts By Type & Occasion, Southold
- Gifts, Cards & Stationery Stores, Southold
- Golf Courses, Southold
- Government, Southold
- Grape Vineyards, Southold
- Grocery Stores & Supermarkets, Southold
- Ground Transportation, Except Passenger, Southold
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