- Games & Hobbies, Southborough
- Garage Door Repair, Southborough
- Garage Doors & Gates, Southborough - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Southborough
- Garbage & Rubbish Removal, Southborough
- Garden & Lawn Sprinkler Repair, Installation & Service, Southborough
- Garment & Linen Services, Southborough
- Gas Equipment Industrial, Southborough
- Gas Station, Southborough - Service & Filling Station
- General Business Consulting, Southborough
- General Business Services, Southborough
- General Consultants, Southborough
- General Freight Trucking, Southborough - Motor Freight
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- General Management Consulting Services, Southborough - Management Consultants
- General Merchandise Stores, Southborough
- Gifts, Cards & Stationery Stores, Southborough
- Golf Courses, Southborough
- Golf Driving Ranges, Southborough
- Golf Lessons & Instruction, Southborough
- Gospel Church, Southborough
- Government, Southborough
- Granite, Southborough
- Grocery Stores & Supermarkets, Southborough
- Grommets, Southborough
- Ground Transportation, Except Passenger, Southborough
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