- Games & Hobbies, Port Washington
- Garage Door Repair, Port Washington
- Garage Doors & Door Operating Devices, Port Washington
- Garage Doors & Gates, Port Washington - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Port Washington
- Garbage & Rubbish Removal, Port Washington
- Garden & Lawn Sprinkler Repair, Installation & Service, Port Washington
- Garment & Linen Services, Port Washington
- Garment Pressing & Cleaners Agents, Port Washington - Laundries & Dry Cleaners
- Gas Engine, Port Washington
- Gas Station, Port Washington - Service & Filling Station
- Gemologists & Jewelers, Port Washington
- General Business Consulting, Port Washington
- General Business Services, Port Washington
- General Consultants, Port Washington
- General Hardware Stores, Port Washington
- General Management Consulting Services, Port Washington - Management Consultants
- General Merchandise Stores, Port Washington
- General Travel Agents & Agencies, Port Washington
- Generator Sales & Rental, Port Washington - Contractors Supplies & Equipment
- Gift Baskets, Port Washington
- Gift Shops, Port Washington - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Port Washington
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- Gifts Wholesale & Retail, Port Washington
- Gifts, Cards & Stationery Stores, Port Washington
- Glass & Glass Products, Port Washington
- Glass & Glazing Contractors, Port Washington
- Glass - Auto, Float, Plate, Window & Doors, Port Washington
- Glass Stained & Leaded, Port Washington
- Glass Tinting & Coating, Port Washington - Home - Car Window Tinting
- Golf Clubs Private, Port Washington
- Golf Course Construction, Port Washington
- Golf Courses, Port Washington
- Golf Lessons & Instruction, Port Washington
- Gourmet Food Stores, Port Washington
- Government, Port Washington
- Graphic Design Services, Port Washington - Graphic Designer
- Graphic Designer & Artist Services, Port Washington
- Graphite, Port Washington
- Greeting Card Stores, Port Washington
- Grills & Grilling Equipment & Supplies, Port Washington
- Grinding Services, Port Washington
- Grocery Stores & Supermarkets, Port Washington
- Ground Transportation, Except Passenger, Port Washington
- Guide & Directory Advertising Services, Port Washington
- Gymnastics Schools, Port Washington
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