- Games & Hobbies, Holtsville
- Garage Door Repair, Holtsville
- Garage, Door & Window Products, Holtsville
- Garbage & Rubbish Removal, Holtsville
- Garment & Linen Services, Holtsville
- Gas Companies, Holtsville
- Gas Station, Holtsville - Service & Filling Station
- General Business Consulting, Holtsville
- General Business Services, Holtsville
- General Consultants, Holtsville
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- General Management Consulting Services, Holtsville - Management Consultants
- General Merchandise Stores, Holtsville
- Generators, Compressors, Pumps, Motors & Fans, Holtsville
- Gifts, Cards & Stationery Stores, Holtsville
- Government, Holtsville
- Granite, Holtsville
- Greeting Card Stores, Holtsville
- Grocery Stores & Supermarkets, Holtsville
- Ground Transportation, Except Passenger, Holtsville
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