- Games & Hobbies, Northport
- Garage Doors & Door Operating Devices, Northport
- Garage Doors & Gates, Northport - Stores & Companies - Install & Repair Services
- Garage Organizers, Northport - Garage Storage Companies
- Garage, Door & Window Products, Northport
- Garment & Linen Services, Northport
- Garment Pressing & Cleaners Agents, Northport - Laundries & Dry Cleaners
- Gas Appliance Repair, Maintenance & Service, Northport
- Gas Station, Northport - Service & Filling Station
- 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 Travel Agents & Agencies, Northport
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- Generator Sales & Rental, Northport - Contractors Supplies & Equipment
- Generators, Compressors, Pumps, Motors & Fans, Northport
- Gift Baskets, Northport
- Gift Shops, Northport - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Northport
- Gifts, Cards & Stationery Stores, Northport
- Glass, Plastic & Rubber Working Machinery, Northport
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Northport
- Golf Equipment & Supplies Stores, Northport - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Northport
- Graphic Design Services, Northport - Graphic Designer
- Graphic Designer & Artist Services, Northport
- Greek Restaurants, Northport
- Grinding Polishing & Lapidating Machines Manufacturers, Northport
- Grocery Stores & Supermarkets, Northport
- Ground Transportation, Except Passenger, Northport
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