- Games & Hobbies, Rockford
- Garage, Door & Window Products, Rockford
- Garbage & Rubbish Removal, Rockford
- Garden & Lawn Sprinkler Repair, Installation & Service, Rockford
- Garment & Linen Services, Rockford
- Gas Station, Rockford - Service & Filling Station
- Gasket, Rockford - Supply & Wholesale - Gaskets, Packing & Sealing Device
- General Business Consulting, Rockford
- General Business Services, Rockford
- General Consultants, Rockford
- General Hardware Stores, Rockford
- General Merchandise Stores, Rockford
- General Travel Agents & Agencies, Rockford
- Generators, Compressors, Pumps, Motors & Fans, Rockford
- Geothermal Heating & Cooling Equipment, Systems & Supplies, Rockford
- Gift Baskets, Rockford
- Gifts By Type & Occasion, Rockford
- Gifts, Cards & Stationery Stores, Rockford
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- Glass & Glass Products, Rockford
- Glass & Glazing Contractors, Rockford
- Glass - Auto, Float, Plate, Window & Doors, Rockford
- Glass - Beveled, Carved, Etched & Ornamental, Rockford
- Glass Plate Windows, Rockford
- Glass Stained & Leaded, Rockford
- Glass Tinting & Coating, Rockford - Home - Car Window Tinting
- Golf Courses, Rockford
- Golf Equipment & Supplies Stores, Rockford - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Food Stores, Rockford
- Gourmet Restaurants, Rockford
- Government, Rockford
- Graphic Design Services, Rockford - Graphic Designer
- Graphic Designer & Artist Services, Rockford
- Grocery Stores & Supermarkets, Rockford
- Ground Transportation, Except Passenger, Rockford
- Gymnastics Schools, Rockford
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