- Games & Hobbies, Syosset
- Garage Door Repair, Syosset
- Garage Doors & Door Operating Devices, Syosset
- Garage Doors & Gates, Syosset - Stores & Companies - Install & Repair Services
- Garage Organizers, Syosset - Garage Storage Companies
- Garage, Door & Window Products, Syosset
- Garbage & Rubbish Removal, Syosset
- Garment & Linen Services, Syosset
- Garment Pressing & Cleaners Agents, Syosset - Laundries & Dry Cleaners
- Gas Companies, Syosset
- Gas Station, Syosset - Service & Filling Station
- Gasoline, Syosset
- Gastroenterologists, Syosset - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Syosset
- General Business Consulting, Syosset
- General Business Services, Syosset
- General Consultants, Syosset
- General Hardware Stores, Syosset
- General Management Consulting Services, Syosset - Management Consultants
- General Merchandise Stores, Syosset
- General Travel Agents & Agencies, Syosset
- Generator Sales & Rental, Syosset - Contractors Supplies & Equipment
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- Gift Baskets, Syosset
- Gift Shops, Syosset - Gift, Novelty & Souvenir Stores
- Gift Wrapping Service, Syosset
- Gifts By Type & Occasion, Syosset
- Gifts, Cards & Stationery Stores, Syosset
- Glass & Glass Products, Syosset
- Glass - Auto, Float, Plate, Window & Doors, Syosset
- Glassware & Chinaware Repair, Syosset
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Syosset
- Golf Courses, Syosset
- Golf Lessons & Instruction, Syosset
- Gospel Church, Syosset
- Gourmet Restaurants, Syosset
- Government, Syosset
- Graphic Design Services, Syosset - Graphic Designer
- Graphic Designer & Artist Services, Syosset
- Greek Restaurants, Syosset
- Grocery Stores & Supermarkets, Syosset
- Ground Transportation, Except Passenger, Syosset
- Guide & Directory Advertising Services, Syosset
- Gymnastics Schools, Syosset
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