- Games & Hobbies, Windham
- Garment & Linen Services, Windham
- Gas Station, Windham - Service & Filling Station
- General Business Consulting, Windham
- General Business Services, Windham
- General Consultants, Windham
- General Freight Trucking, Windham - Motor Freight
- General Hardware Stores, Windham
- General Management Consulting Services, Windham - Management Consultants
- General Merchandise Stores, Windham
- General Travel Agents & Agencies, Windham
- Generators, Compressors, Pumps, Motors & Fans, Windham
- Gifts, Cards & Stationery Stores, Windham
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- Glass & Glazing Contractors, Windham
- Glass Tinting & Coating, Windham - Home - Car Window Tinting
- Golf Courses, Windham
- Golf Lessons & Instruction, Windham
- Gourmet Restaurants, Windham
- Government, Windham
- Granite, Windham
- Grocery Stores & Supermarkets, Windham
- Ground Transportation, Except Passenger, Windham
- Gummed Tape, Windham
- Gun Repair & Services, Windham
- Guns & Gunsmith Services, Windham
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