- Games & Hobbies, Galesburg
- Garage Building & Repair, Galesburg - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Galesburg
- Garage Doors & Gates, Galesburg - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Galesburg
- Garbage & Rubbish Removal, Galesburg
- Garment & Linen Services, Galesburg
- Gas Companies, Galesburg
- Gas Equipment Industrial, Galesburg
- Gas Station, Galesburg - Service & Filling Station
- Gasoline, Galesburg
- General Business Services, Galesburg
- General Merchandise Stores, Galesburg
- General Surgeons, Galesburg - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Galesburg
- Generator Sales & Rental, Galesburg - Contractors Supplies & Equipment
- Generators, Compressors, Pumps, Motors & Fans, Galesburg
- Geotechnical Engineer, Galesburg
- Gift Shops, Galesburg - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Galesburg
- Glass & Glass Products, Galesburg
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- Glass - Auto, Float, Plate, Window & Doors, Galesburg
- Glass Giftware, Galesburg
- Glass Stained & Leaded, Galesburg
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Galesburg
- Golf Clubs Private, Galesburg
- Golf Courses, Galesburg
- Gospel Church, Galesburg
- Gourmet Restaurants, Galesburg
- Government, Galesburg
- Grain Elevators, Galesburg
- Grain Warehousing & Storage, Galesburg
- Graphic Design Services, Galesburg - Graphic Designer
- Graphic Designer & Artist Services, Galesburg
- Greek Restaurants, Galesburg
- Greeting Card Stores, Galesburg
- Grocery Stores & Supermarkets, Galesburg
- Ground Transportation, Except Passenger, Galesburg
- Gun Repair & Services, Galesburg
- Guns & Gunsmith Services, Galesburg
- Gymnastics Schools, Galesburg
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