- Garage Door Repair, Alton
- Garage Doors & Door Operating Devices, Alton
- Garage Doors & Gates, Alton - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Alton
- Garbage & Rubbish Removal, Alton
- Garment & Linen Services, Alton
- Gas Companies, Alton
- Gas Equipment Industrial, Alton
- Gas Station, Alton - Service & Filling Station
- Gastroenterologists, Alton - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Alton
- General Business Services, Alton
- General Consultants, Alton
- General Hardware Stores, Alton
- General Management Consulting Services, Alton - Management Consultants
- General Merchandise Stores, Alton
- General Surgeons, Alton - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Alton
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- Generators, Compressors, Pumps, Motors & Fans, Alton
- Gift Shops, Alton - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Alton
- Glass & Glass Products, Alton
- Glass & Glazing Contractors, Alton
- Glass - Auto, Float, Plate, Window & Doors, Alton
- Glass Tinting & Coating, Alton - Home - Car Window Tinting
- Golf Courses, Alton
- Gourmet Food Stores, Alton
- Gourmet Restaurants, Alton
- Government, Alton
- Graphic Design Services, Alton - Graphic Designer
- Graphic Designer & Artist Services, Alton
- Greeting Card Stores, Alton
- Grocery Stores & Supermarkets, Alton
- Ground Transportation, Except Passenger, Alton
- Gun Repair & Services, Alton
- Guns & Gunsmith Services, Alton
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