- Gambling & Lottery Services, Mason City
- Games & Hobbies, Mason City
- Garage Building & Repair, Mason City - Carports - Garage Builders
- Garage Door Repair, Mason City
- Garage Doors & Door Operating Devices, Mason City
- Garage Doors & Gates, Mason City - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Mason City
- Garbage & Rubbish Removal, Mason City
- Garment & Linen Services, Mason City
- Gas Companies, Mason City
- Gas Equipment Industrial, Mason City
- Gas Station, Mason City - Service & Filling Station
- Gastroenterologists, Mason City - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Mason City
- General Business Services, Mason City
- General Freight Trucking, Mason City - Motor Freight
- General Hardware Stores, Mason City
- General Management Consulting Services, Mason City - Management Consultants
- General Merchandise Stores, Mason City
- Generators, Compressors, Pumps, Motors & Fans, Mason City
- Geotechnical Soils Engineer, Mason City
- Geothermal Heating & Cooling Contractors, Mason City - Geothermal HVAC - Installation
- Gift Shops, Mason City - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Mason City
- Glass & Glass Products, Mason City
- Glass - Auto, Float, Plate, Window & Doors, Mason City
- Golf Courses, Mason City
- Golf Driving Ranges, Mason City
- Golf Equipment Repair & Sales, Mason City - Clubs, Carts, Bags & More
- Golf Lessons & Instruction, Mason City
- Gospel Church, Mason City
- Gourmet Restaurants, Mason City
- Government, Mason City
- Government And Administration Attorneys & Lawyers, Mason City
- Government And Administration Lawyers & Attorneys, Mason City
- Grain Elevators, Mason City
- Granite, Mason City
- Graphic Design Services, Mason City - Graphic Designer
- Graphic Designer & Artist Services, Mason City
- Greek Churches, Mason City
- Greeting Card Stores, Mason City
- Grocery Stores & Supermarkets, Mason City
- Ground Transportation, Except Passenger, Mason City
- Guide & Directory Advertising Services, Mason City
- Gun Repair & Services, Mason City
- Guns & Gunsmith Services, Mason City
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