- Games & Hobbies, Ottumwa
- Garage Building & Repair, Ottumwa - Carports - Garage Builders
- Garage Door Repair, Ottumwa
- Garage Doors & Door Operating Devices, Ottumwa
- Garage Doors & Gates, Ottumwa - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Ottumwa
- Garbage & Rubbish Removal, Ottumwa
- Garden & Lawn Equipment & Supplies Rental & Leasing, Ottumwa
- Garment & Linen Services, Ottumwa
- Gas Equipment Industrial, Ottumwa
- Gas Station, Ottumwa - Service & Filling Station
- General Business Services, Ottumwa
- General Freight Trucking, Ottumwa - Motor Freight
- General Merchandise Stores, Ottumwa
- General Travel Agents & Agencies, Ottumwa
- Geothermal Heating & Cooling Equipment, Systems & Supplies, Ottumwa
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- Gifts, Cards & Stationery Stores, Ottumwa
- Glass & Glass Products, Ottumwa
- Glass - Auto, Float, Plate, Window & Doors, Ottumwa
- Golf Clubs Private, Ottumwa
- Golf Courses, Ottumwa
- Golf Lessons & Instruction, Ottumwa
- Government, Ottumwa
- Grain Elevators, Ottumwa
- Granite, Ottumwa
- Graphic Design Services, Ottumwa - Graphic Designer
- Graphic Designer & Artist Services, Ottumwa
- Greeting Card Stores, Ottumwa
- Grocery Stores & Supermarkets, Ottumwa
- Ground Transportation, Except Passenger, Ottumwa
- Gun Repair & Services, Ottumwa
- Guns & Gunsmith Services, Ottumwa
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