- Games & Hobbies, Rockville Centre
- Garage Door Repair, Rockville Centre
- Garage Doors & Door Operating Devices, Rockville Centre
- Garage Doors & Gates, Rockville Centre - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Rockville Centre
- Garbage & Rubbish Removal, Rockville Centre
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Rockville Centre
- Garment & Linen Services, Rockville Centre
- Gas Station, Rockville Centre - Service & Filling Station
- Gastroenterologists, Rockville Centre - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Rockville Centre
- General Business Services, Rockville Centre
- General Freight Trucking, Rockville Centre - Motor Freight
- General Hardware Stores, Rockville Centre
- General Management Consulting Services, Rockville Centre - Management Consultants
- General Merchandise Stores, Rockville Centre
- General Surgeons, Rockville Centre - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Rockville Centre
- Generator Sales & Rental, Rockville Centre - Contractors Supplies & Equipment
- Geriatric Care Management, Rockville Centre
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- Gift Baskets, Rockville Centre
- Gift Shops, Rockville Centre - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Rockville Centre
- Gifts, Cards & Stationery Stores, Rockville Centre
- Glass & Glass Products, Rockville Centre
- Glass - Auto, Float, Plate, Window & Doors, Rockville Centre
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Rockville Centre
- Golf Courses, Rockville Centre
- Government, Rockville Centre
- Graphic Design Services, Rockville Centre - Graphic Designer
- Graphic Designer & Artist Services, Rockville Centre
- Greek Restaurants, Rockville Centre
- Greeting Card Stores, Rockville Centre
- Grocery Stores & Supermarkets, Rockville Centre
- Ground Transportation, Except Passenger, Rockville Centre
- Guide & Directory Advertising Services, Rockville Centre
- Gun Repair & Services, Rockville Centre
- Guns & Gunsmith Services, Rockville Centre
- Gutters & Downspout Cleaning & Repairing, Rockville Centre
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