- Games & Hobbies, Northborough
- Garage Door Repair, Northborough
- Garage Doors & Gates, Northborough - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Northborough
- Garbage & Rubbish Removal, Northborough
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Northborough
- Garment & Linen Services, Northborough
- Gas Companies, Northborough
- Gas Detection, Asbestos & Lead Contractors, Northborough
- Gas Station, Northborough - Service & Filling Station
- Gemologists & Jewelers, Northborough
- General Business Consulting, Northborough
- General Business Services, Northborough
- General Consultants, Northborough
- General Freight Trucking, Northborough - Motor Freight
- General Hardware Stores, Northborough
- General Management Consulting Services, Northborough - Management Consultants
- General Merchandise Stores, Northborough
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- Generators, Compressors, Pumps, Motors & Fans, Northborough
- Gift Shops, Northborough - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Northborough
- Gifts, Cards & Stationery Stores, Northborough
- Glass & Glass Products, Northborough
- Glass Stained & Leaded, Northborough
- Golf Courses, Northborough
- Golf Equipment & Supplies Stores, Northborough - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Northborough
- Government, Northborough
- Graphic Design Services, Northborough - Graphic Designer
- Graphic Designer & Artist Services, Northborough
- Greeting Card Stores, Northborough
- Grocery Stores & Supermarkets, Northborough
- Ground Transportation, Except Passenger, Northborough
- Gun Repair & Services, Northborough
- Guns & Gunsmith Services, Northborough
- Gym Equipment & Supplies, Northborough
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