- Games & Hobbies, Islip
- Garage Door Repair, Islip
- Garage Doors & Door Operating Devices, Islip
- Garage Doors & Gates, Islip - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Islip
- Garbage & Rubbish Removal, Islip
- Garbage Container Receptacles Manufacturers, Islip
- Garment & Linen Services, Islip
- Gas Station, Islip - Service & Filling Station
- General Business Services, Islip
- General Travel Agents & Agencies, Islip
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- Gift Baskets, Islip
- Gifts By Type & Occasion, Islip
- Gifts, Cards & Stationery Stores, Islip
- Glass & Glass Products, Islip
- Glass - Auto, Float, Plate, Window & Doors, Islip
- Government, Islip
- Graphic Design Services, Islip - Graphic Designer
- Graphic Designer & Artist Services, Islip
- Greek Restaurants, Islip
- Grocery Stores & Supermarkets, Islip
- Ground Transportation, Except Passenger, Islip
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