- Games & Hobbies, Port Jefferson
- Garage Building & Repair, Port Jefferson - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Port Jefferson
- Garage Doors & Gates, Port Jefferson - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Port Jefferson
- Garden & Lawn Sprinkler Repair, Installation & Service, Port Jefferson
- Garment & Linen Services, Port Jefferson
- Gas Appliance Repair, Maintenance & Service, Port Jefferson
- General Business Consulting, Port Jefferson
- General Business Services, Port Jefferson
- General Consultants, Port Jefferson
- General Merchandise Stores, Port Jefferson
- General Surgeons, Port Jefferson - General Surgery Doctors, Physicians & Surgeons
|
- General Travel Agents & Agencies, Port Jefferson
- Gift Shops, Port Jefferson - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Port Jefferson
- Glass & Glass Products, Port Jefferson
- Glass - Auto, Float, Plate, Window & Doors, Port Jefferson
- Golf Courses, Port Jefferson
- Gourmet Food Stores, Port Jefferson
- Gourmet Restaurants, Port Jefferson
- Government, Port Jefferson
- Grape Vineyards, Port Jefferson
- Greek Churches, Port Jefferson
- Grocery Stores & Supermarkets, Port Jefferson
- Ground Transportation, Except Passenger, Port Jefferson
|
