- Games & Hobbies, Omro
- Garage Doors & Door Operating Devices, Omro
- Garage Doors & Gates, Omro - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Omro
- Garbage & Rubbish Removal, Omro
- Gas Companies, Omro
- Gas Piping Contractors, Omro - Gas Pipe Installation & Repair Service
- General Business Services, Omro
- General Freight Trucking, Omro - Motor Freight
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- General Merchandise Stores, Omro
- Generators, Compressors, Pumps, Motors & Fans, Omro
- Golf Cars & Carts, Omro
- Golf Cars & Carts Repair & Service, Omro
- Golf Courses, Omro
- Government, Omro
- Grocery Stores & Supermarkets, Omro
- Ground Transportation, Except Passenger, Omro
- Gun & Hunting & Fishing Clubs, Omro
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