- Games & Hobbies, Schaumburg
- Garage Door Repair, Schaumburg
- Garage Doors & Door Operating Devices, Schaumburg
- Garage Doors & Gates, Schaumburg - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Schaumburg
- Garbage & Rubbish Removal, Schaumburg
- Garment & Linen Services, Schaumburg
- Garment Pressing & Cleaners Agents, Schaumburg - Laundries & Dry Cleaners
- Gas Companies, Schaumburg
- Gas Station, Schaumburg - Service & Filling Station
- Gasket, Schaumburg - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gasoline, Schaumburg
- Gemologists & Jewelers, Schaumburg
- Gemstone & Industrial Diamond Mining, Schaumburg
- General Business Consulting, Schaumburg
- General Business Services, Schaumburg
- General Consultants, Schaumburg
- General Freight Trucking, Schaumburg - Motor Freight
- General Hardware Stores, Schaumburg
- General Management Consulting Services, Schaumburg - Management Consultants
- General Merchandise Stores, Schaumburg
- General Travel Agents & Agencies, Schaumburg
- Generators, Compressors, Pumps, Motors & Fans, Schaumburg
- Geotechnical Soils Engineer, Schaumburg
- Gift Baskets, Schaumburg
- Gift Shops, Schaumburg - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Schaumburg
- Gifts, Cards & Stationery Stores, Schaumburg
- Glass & Glass Products, Schaumburg
- Glass & Glazing Contractors, Schaumburg
- Glass - Auto, Float, Plate, Window & Doors, Schaumburg
- Glass Tinting & Coating, Schaumburg - Home - Car Window Tinting
- Glass, Plastic & Rubber Working Machinery, Schaumburg
- Glassware Retail, Schaumburg
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Schaumburg
- Golf Equipment & Supplies Stores, Schaumburg - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Schaumburg
- Government, Schaumburg
- Gps Navigation Systems & Services, Schaumburg
- Granite, Schaumburg
- Graphic & Computer Advertising Services, Schaumburg
- Graphic Design Services, Schaumburg - Graphic Designer
- Graphic Designer & Artist Services, Schaumburg
- Greek Restaurants, Schaumburg
- Greeting Card Stores, Schaumburg
- Grills & Grilling Equipment & Supplies Manufacturers, Schaumburg
- Grocery Stores & Supermarkets, Schaumburg
- Ground Transportation, Except Passenger, Schaumburg
- Group Homes, Schaumburg
- Guide & Directory Advertising Services, Schaumburg
- Gymnastics Equipment & Supplies, Schaumburg
- Gynecologists, Schaumburg - Gynecology Doctors, Physicians & Surgeons
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