- Garage Doors & Gates, Windham - Stores & Companies - Install & Repair Services
- Garbage & Rubbish Removal, Windham
- Garment & Linen Services, Windham
- Gas Companies, Windham
- Gas Recycling Plants, Windham
- 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
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- Generators, Compressors, Pumps, Motors & Fans, Windham
- Gifts, Cards & Stationery Stores, Windham
- Glass & Glass Products, Windham
- Glass - Auto, Float, Plate, Window & Doors, Windham
- Glass Decorative, Windham
- Glass Rods & Tubing, Windham
- Government, Windham
- Graphic Design Services, Windham - Graphic Designer
- Graphic Designer & Artist Services, Windham
- Grocery Stores & Supermarkets, Windham
- Ground Transportation, Except Passenger, Windham
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