- Games & Hobbies, Romeoville
- Garage Door Repair, Romeoville
- Garage Doors & Door Operating Devices, Romeoville
- Garage Doors & Gates, Romeoville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Romeoville
- Garment & Linen Services, Romeoville
- Gas & Air Compressors, Romeoville
- Gas Equipment Industrial, Romeoville
- Gas Piping Contractors, Romeoville - Gas Pipe Installation & Repair Service
- Gas Station, Romeoville - Service & Filling Station
- Gears, Romeoville
- Gears & Gear Cutting, Romeoville
- General Business Consulting, Romeoville
- General Business Services, Romeoville
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- General Consultants, Romeoville
- General Freight Trucking, Romeoville - Motor Freight
- General Hardware Stores, Romeoville
- General Management Consulting Services, Romeoville - Management Consultants
- General Merchandise Stores, Romeoville
- General Travel Agents & Agencies, Romeoville
- Generators, Compressors, Pumps, Motors & Fans, Romeoville
- Gift Shops, Romeoville - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Romeoville
- Golf Courses, Romeoville
- Government, Romeoville
- Granite, Romeoville
- Grocery Stores & Supermarkets, Romeoville
- Ground Transportation, Except Passenger, Romeoville
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