- Garment & Linen Services, Watford City
- Gas & Air Compressors, Watford City
- Gas Companies, Watford City
- Gas Line Installation Contractors, Watford City - Gas Pipe Installation - Repair Service
- Gas Station, Watford City - Service & Filling Station
- General Business Consulting, Watford City
- General Business Services, Watford City
- General Consultants, Watford City
- General Freight Trucking, Watford City - Motor Freight
- General Management Consulting Services, Watford City - Management Consultants
- General Merchandise Stores, Watford City
- Generators, Compressors, Pumps, Motors & Fans, Watford City
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- Gifts, Cards & Stationery Stores, Watford City
- Glass & Glass Products, Watford City
- Glass - Auto, Float, Plate, Window & Doors, Watford City
- Golf Clubs Private, Watford City
- Golf Courses, Watford City
- Government, Watford City
- Grain Elevators, Watford City
- Grocery Stores & Supermarkets, Watford City
- Ground Transportation, Except Passenger, Watford City
- Gun Repair & Services, Watford City
- Guns & Gunsmith Services, Watford City
- Gymnastics Schools, Watford City
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