- Games & Hobbies, Barrington
- Garage Door Repair, Barrington
- Garage Doors & Door Operating Devices, Barrington
- Garage Doors & Gates, Barrington - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Barrington
- Garbage & Rubbish Removal, Barrington
- Garment & Linen Services, Barrington
- Gas Companies, Barrington
- Gas Station, Barrington - Service & Filling Station
- Gasoline, Barrington
- Gastroenterologists, Barrington - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Barrington
- General Business Consulting, Barrington
- General Business Services, Barrington
- General Consultants, Barrington
- General Hardware Stores, Barrington
- General Management Consulting Services, Barrington - Management Consultants
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- General Merchandise Stores, Barrington
- General Travel Agents & Agencies, Barrington
- Generators, Compressors, Pumps, Motors & Fans, Barrington
- Geriatric Care & Consulting, Barrington
- Gifts, Cards & Stationery Stores, Barrington
- Glass & Glazing Contractors, Barrington
- Glass Tinting & Coating, Barrington - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Barrington
- Golf Courses, Barrington
- Gourmet Restaurants, Barrington
- Government, Barrington
- Granite, Barrington
- Graphic Design Services, Barrington - Graphic Designer
- Graphic Designer & Artist Services, Barrington
- Greeting Card Stores, Barrington
- Grocery Stores & Supermarkets, Barrington
- Ground Transportation, Except Passenger, Barrington
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