- Games & Hobbies, Mattituck
- Garage Doors & Door Operating Devices, Mattituck
- Garage Doors & Gates, Mattituck - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Mattituck
- Garbage & Rubbish Removal, Mattituck
- Garment & Linen Services, Mattituck
- Gas Station, Mattituck - Service & Filling Station
- General Business Services, Mattituck
- General Travel Agents & Agencies, Mattituck
- Generators, Compressors, Pumps, Motors & Fans, Mattituck
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- Gift Shops, Mattituck - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Mattituck
- Golf Clubs Private, Mattituck
- Golf Courses, Mattituck
- Government, Mattituck
- Greek Churches, Mattituck
- Greek Restaurants, Mattituck
- Grocery Stores & Supermarkets, Mattituck
- Ground Transportation, Except Passenger, Mattituck
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