- Games & Hobbies, New Haven
- Garage Doors & Door Operating Devices, New Haven
- Garage Doors & Gates, New Haven - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, New Haven
- Garment & Linen Services, New Haven
- Gas Station, New Haven - Service & Filling Station
- General Business Services, New Haven
- General Merchandise Stores, New Haven
- General Travel Agents & Agencies, New Haven
- Glass & Glazing Contractors, New Haven
- Glass Tinting & Coating, New Haven - Home - Car Window Tinting
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- Golf Courses, New Haven
- Government, New Haven
- Government Contract & Relations Consultants, New Haven
- Government Information & Offices Miscellaneous, New Haven
- Grain Elevators, New Haven
- Graphic Design Services, New Haven - Graphic Designer
- Graphic Designer & Artist Services, New Haven
- Green - Landscape Contractors, New Haven
- Grocery Stores & Supermarkets, New Haven
- Ground Transportation, Except Passenger, New Haven
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