- Games & Hobbies, West Islip
- Garage Doors & Door Operating Devices, West Islip
- Garage Doors & Gates, West Islip - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, West Islip
- Garden & Lawn Sprinkler Repair, Installation & Service, West Islip
- Garden Design, West Islip
- Garment & Linen Services, West Islip
- Garment Pressing & Cleaners Agents, West Islip - Laundries & Dry Cleaners
- Gas Companies, West Islip
- Gas Station, West Islip - Service & Filling Station
- General Business Consulting, West Islip
- General Business Services, West Islip
- General Consultants, West Islip
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- General Hardware Stores, West Islip
- General Management Consulting Services, West Islip - Management Consultants
- General Merchandise Stores, West Islip
- General Surgeons, West Islip - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, West Islip
- Gifts, Cards & Stationery Stores, West Islip
- Glass & Glass Products, West Islip
- Glass - Auto, Float, Plate, Window & Doors, West Islip
- Government, West Islip
- Greeting Card Stores, West Islip
- Grocery Stores & Supermarkets, West Islip
- Ground Transportation, Except Passenger, West Islip
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