- Game & Wildlife Consultants, Miles City
- Game Processing, Miles City
- Games & Hobbies, Miles City
- Garage Doors & Door Operating Devices, Miles City
- Garage Doors & Gates, Miles City - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Miles City
- Garbage & Rubbish Removal, Miles City
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Miles City
- Garment & Linen Services, Miles City
- Gas Station, Miles City - Service & Filling Station
- Gasoline, Miles City
- Gemologists & Jewelers, Miles City
- General Business Consulting, Miles City
- General Business Services, Miles City
- General Consultants, Miles City
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- General Freight Trucking, Miles City - Motor Freight
- General Hardware Stores, Miles City
- General Merchandise Stores, Miles City
- General Surgeons, Miles City - General Surgery Doctors, Physicians & Surgeons
- Generators, Compressors, Pumps, Motors & Fans, Miles City
- Gifts, Cards & Stationery Stores, Miles City
- Glass & Glass Products, Miles City
- Glass - Auto, Float, Plate, Window & Doors, Miles City
- Government, Miles City
- Grain Brokers, Miles City
- Grocery Stores & Supermarkets, Miles City
- Ground Transportation, Except Passenger, Miles City
- Group Homes, Miles City
- Gun Repair & Services, Miles City
- Guns & Gunsmith Services, Miles City
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