- Games & Hobbies, Middleton
- Garage, Door & Window Products, Middleton
- Garden & Lawn Sprinkler Repair, Installation & Service, Middleton
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Middleton
- Garment & Linen Services, Middleton
- Gas Piping Contractors, Middleton - Gas Pipe Installation & Repair Service
- Gas Station, Middleton - Service & Filling Station
- General Business Consulting, Middleton
- General Business Services, Middleton
- General Consultants, Middleton
- General Freight Trucking, Middleton - Motor Freight
- General Hardware Stores, Middleton
- General Management Consulting Services, Middleton - Management Consultants
- General Merchandise Stores, Middleton
- General Travel Agents & Agencies, Middleton
- Gift Shops, Middleton - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Middleton
- Glass & Glass Products, Middleton
- Glass & Glazing Contractors, Middleton
- Glass - Auto, Float, Plate, Window & Doors, Middleton
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- Glass Plate Windows, Middleton
- Glass Stained & Leaded, Middleton
- Glass Tinting & Coating, Middleton - Home - Car Window Tinting
- Glassware Decorators Manufacturers, Middleton
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Middleton
- Golf Courses, Middleton
- Golf Lessons & Instruction, Middleton
- Gourmet Restaurants, Middleton
- Government, Middleton
- Grain Bins, Middleton
- Graphic Design Services, Middleton - Graphic Designer
- Graphic Designer & Artist Services, Middleton
- Greeting Card Stores, Middleton
- Grocery Stores & Supermarkets, Middleton
- Ground Spices Manufacturers, Middleton
- Ground Transportation, Except Passenger, Middleton
- Guide & Directory Advertising Services, Middleton
- Gutters & Downspout Cleaning & Repairing, Middleton
- Gymnastics Schools, Middleton
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