- Games & Hobbies, Houlton
- Garage Doors & Door Operating Devices, Houlton
- Garage Doors & Gates, Houlton - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Houlton
- Garbage & Rubbish Removal, Houlton
- Garment & Linen Services, Houlton
- Gas Engine, Houlton
- Gas Station, Houlton - Service & Filling Station
- General Business Consulting, Houlton
- General Business Services, Houlton
- General Consultants, Houlton
- General Freight Trucking, Houlton - Motor Freight
- General Management Consulting Services, Houlton - Management Consultants
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- General Merchandise Stores, Houlton
- General Surgeons, Houlton - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Houlton
- Gifts, Cards & Stationery Stores, Houlton
- Glass & Glass Products, Houlton
- Glass - Auto, Float, Plate, Window & Doors, Houlton
- Golf Courses, Houlton
- Gospel Church, Houlton
- Government, Houlton
- Grocery Stores & Supermarkets, Houlton
- Ground Transportation, Except Passenger, Houlton
- Gun Repair & Services, Houlton
- Guns & Gunsmith Services, Houlton
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