- Gambling & Lottery Services, Winchendon
- Games Toys & Childrens Vehicles Manufacturers, Winchendon
- Garage Building & Repair, Winchendon - Carports - Garage Builders
- Garment & Linen Services, Winchendon
- Gasoline, Winchendon
- General Business Services, Winchendon
- General Freight Trucking, Winchendon - Motor Freight
- General Merchandise Stores, Winchendon
- Generators, Compressors, Pumps, Motors & Fans, Winchendon
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- Gift Shops, Winchendon - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Winchendon
- Glass & Glass Products, Winchendon
- Glass - Auto, Float, Plate, Window & Doors, Winchendon
- Golf Courses, Winchendon
- Government, Winchendon
- Grocery Stores & Supermarkets, Winchendon
- Ground Transportation, Except Passenger, Winchendon
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