- Games & Hobbies, Northport
- Garage Doors & Door Operating Devices, Northport
- Garage Doors & Gates, Northport - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Northport
- Garden & Lawn Sprinkler Repair, Installation & Service, Northport
- Garment & Linen Services, Northport
- Gas Companies, Northport
- Gas Station, Northport - Service & Filling Station
- Gastroenterologists, Northport - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gate & Fence Repair, Northport
- General Business Consulting, Northport
- General Business Services, Northport
- General Consultants, Northport
- General Freight Trucking, Northport - Motor Freight
- General Hardware Stores, Northport
- General Management Consulting Services, Northport - Management Consultants
- General Merchandise Stores, Northport
- General Surgeons, Northport - General Surgery Doctors, Physicians & Surgeons
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- Generators, Compressors, Pumps, Motors & Fans, Northport
- Gift Baskets, Northport
- Gifts By Type & Occasion, Northport
- Gifts, Cards & Stationery Stores, Northport
- Glass & Glazing Contractors, Northport
- Glass Tinting & Coating, Northport - Home - Car Window Tinting
- Golf Cars & Carts, Northport
- Golf Courses, Northport
- Government, Northport
- Grading Contractors, Northport - Excavating - Excavation Companies
- Greek Restaurants, Northport
- Grills & Grilling Equipment & Supplies, Northport
- Grocery Stores & Supermarkets, Northport
- Ground Transportation, Except Passenger, Northport
- Gun Repair & Services, Northport
- Guns & Gunsmith Services, Northport
- Gutters & Downspout Cleaning & Repairing, Northport
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