- Garage, Door & Window Products, Havre
- Garbage & Rubbish Removal, Havre
- Garment & Linen Services, Havre
- Gas Companies, Havre
- Gas Station, Havre - Service & Filling Station
- Gasoline, Havre
- General Business Consulting, Havre
- General Business Services, Havre
- General Consultants, Havre
- General Freight Trucking, Havre - Motor Freight
- General Management Consulting Services, Havre - Management Consultants
- General Merchandise Stores, Havre
- General Surgeons, Havre - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Havre
- Generators, Compressors, Pumps, Motors & Fans, Havre
- Gift Shops, Havre - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Havre
- Glass & Glass Products, Havre
- Glass & Glazing Contractors, Havre
- Glass - Auto, Float, Plate, Window & Doors, Havre
- Glass Tinting & Coating, Havre - Home - Car Window Tinting
- Golf Courses, Havre
- Government, Havre
- Grain Bins, Havre
- Grain Elevators, Havre
- Greeting Card Stores, Havre
- Grocery Stores & Supermarkets, Havre
- Ground Transportation, Except Passenger, Havre
- Gun Repair & Services, Havre
- Guns & Gunsmith Services, Havre
- Gymnastics Schools, Havre
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