- Gambling & Lottery Services, Ronkonkoma
- Games & Hobbies, Ronkonkoma
- Garage Door Repair, Ronkonkoma
- Garage Doors & Door Operating Devices, Ronkonkoma
- Garage Doors & Gates, Ronkonkoma - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Ronkonkoma
- Garbage & Rubbish Removal, Ronkonkoma
- Garden & Lawn Sprinkler Repair, Installation & Service, Ronkonkoma
- Garment & Linen Services, Ronkonkoma
- Gas Appliance Repair, Maintenance & Service, Ronkonkoma
- Gas Companies, Ronkonkoma
- Gas Detection, Asbestos & Lead Contractors, Ronkonkoma
- Gas Station, Ronkonkoma - Service & Filling Station
- Gears, Ronkonkoma
- Gears & Gear Cutting, Ronkonkoma
- General Business Consulting, Ronkonkoma
- General Business Services, Ronkonkoma
- General Consultants, Ronkonkoma
- General Freight Trucking, Ronkonkoma - Motor Freight
- General Hardware Stores, Ronkonkoma
- General Management Consulting Services, Ronkonkoma - Management Consultants
- General Merchandise Stores, Ronkonkoma
- General Travel Agents & Agencies, Ronkonkoma
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- Generators, Compressors, Pumps, Motors & Fans, Ronkonkoma
- Gift Shops, Ronkonkoma - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Ronkonkoma
- Glass & Glass Products, Ronkonkoma
- Glass - Auto, Float, Plate, Window & Doors, Ronkonkoma
- Glass - Beveled, Carved, Etched & Ornamental, Ronkonkoma
- Glass, Plastic & Rubber Working Machinery, Ronkonkoma
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Ronkonkoma
- Golf Cars & Carts, Ronkonkoma
- Golf Equipment & Supplies Stores, Ronkonkoma - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Ronkonkoma
- Granite, Ronkonkoma
- Graphic Design Services, Ronkonkoma - Graphic Designer
- Graphic Designer & Artist Services, Ronkonkoma
- Greek Restaurants, Ronkonkoma
- Grinding Services, Ronkonkoma
- Grocery Stores & Supermarkets, Ronkonkoma
- Ground Transportation, Except Passenger, Ronkonkoma
- Guide & Directory Advertising Services, Ronkonkoma
- Gummed Tape, Ronkonkoma
- Gun Repair & Services, Ronkonkoma
- Guns & Gunsmith Services, Ronkonkoma
- Gymnastics Schools, Ronkonkoma
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