- Gambling & Lottery Services, Smithtown
- Games & Hobbies, Smithtown
- Garage Door Repair, Smithtown
- Garage Doors & Door Operating Devices, Smithtown
- Garage Doors & Gates, Smithtown - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Smithtown
- Garbage & Rubbish Removal, Smithtown
- Garden & Lawn Sprinkler Repair, Installation & Service, Smithtown
- Garment & Linen Services, Smithtown
- Gas Companies, Smithtown
- Gas Station, Smithtown - Service & Filling Station
- Gastroenterologists, Smithtown - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Smithtown
- General Business Services, Smithtown
- General Consultants, Smithtown
- General Hardware Stores, Smithtown
- General Management Consulting Services, Smithtown - Management Consultants
- General Merchandise Stores, Smithtown
- General Surgeons, Smithtown - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Smithtown
- Generator Sales & Rental, Smithtown - Contractors Supplies & Equipment
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- Gift Baskets, Smithtown
- Gift Shops, Smithtown - Gift, Novelty & Souvenir Stores
- Gift Wrapping Materials, Smithtown
- Gifts By Type & Occasion, Smithtown
- Gifts, Cards & Stationery Stores, Smithtown
- Glass & Glass Products, Smithtown
- Glass & Glazing Contractors, Smithtown
- Glass - Auto, Float, Plate, Window & Doors, Smithtown
- Glass Tinting & Coating, Smithtown - Home - Car Window Tinting
- Golf Courses, Smithtown
- Gourmet Food Stores, Smithtown
- Government, Smithtown
- Granite, Smithtown
- Graphic Design Services, Smithtown - Graphic Designer
- Graphic Designer & Artist Services, Smithtown
- Greek Restaurants, Smithtown
- Greeting Card Stores, Smithtown
- Grocery Stores & Supermarkets, Smithtown
- Ground Transportation, Except Passenger, Smithtown
- Gutters & Downspout Cleaning & Repairing, Smithtown
- Gymnastics Schools, Smithtown
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