- Games & Hobbies, Northbrook
- Garage Building & Repair, Northbrook - Carports - Garage Builders
- Garage Door Repair, Northbrook
- Garage Doors & Door Operating Devices, Northbrook
- Garage Doors & Gates, Northbrook - Stores & Companies - Install & Repair Services
- Garage Equipment & Accessories, Northbrook
- Garage, Door & Window Products, Northbrook
- Garbage & Rubbish Removal, Northbrook
- Garment & Linen Services, Northbrook
- Gas Companies, Northbrook
- Gas Station, Northbrook - Service & Filling Station
- Gemologists & Jewelers, Northbrook
- General Business Consulting, Northbrook
- General Business Services, Northbrook
- General Consultants, Northbrook
- General Hardware Stores, Northbrook
- General Management Consultants & Services, Northbrook
- General Management Consulting Services, Northbrook - Management Consultants
- General Merchandise Stores, Northbrook
- General Travel Agents & Agencies, Northbrook
- Gift Baskets, Northbrook
- Gift Shops, Northbrook - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Northbrook
- Gifts Wholesale & Retail, Northbrook
- Gifts, Cards & Stationery Stores, Northbrook
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- Glass & Glass Products, Northbrook
- Glass & Glazing Contractors, Northbrook
- Glass - Auto, Float, Plate, Window & Doors, Northbrook
- Glass Tinting & Coating, Northbrook - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Northbrook
- Golf Courses, Northbrook
- Golf Equipment & Supplies Stores, Northbrook - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Northbrook
- Government, Northbrook
- Granite, Northbrook
- Granite Counter Tops, Northbrook
- Graphic Design Services, Northbrook - Graphic Designer
- Graphic Designer & Artist Services, Northbrook
- Graphite, Northbrook
- Grease Traps, Northbrook
- Greek Restaurants, Northbrook
- Greeting Card Stores, Northbrook
- Grinding Services, Northbrook
- Grinding Wheels, Northbrook
- Grocery Stores & Supermarkets, Northbrook
- Ground Transportation, Except Passenger, Northbrook
- Guide & Directory Advertising Services, Northbrook
- Gutters & Downspout Cleaning & Repairing, Northbrook
- Gymnastics Schools, Northbrook
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