- Game Farms, Janesville
- Games & Hobbies, Janesville
- Garage Building & Repair, Janesville - Carports - Garage Builders
- Garage Door Repair, Janesville
- Garage Doors & Door Operating Devices, Janesville
- Garage Doors & Gates, Janesville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Janesville
- Garbage & Rubbish Removal, Janesville
- Garbage Disposal Equipment Repair & Service, Janesville
- Garbage Disposals, Janesville
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Janesville
- Garment & Linen Services, Janesville
- Gas Companies, Janesville
- Gas Equipment Industrial, Janesville
- Gas Station, Janesville - Service & Filling Station
- Gasoline, Janesville
- Gastroenterologists, Janesville - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gauges, Janesville
- Gauges & Gages, Janesville
- Gemologists & Jewelers, Janesville
- General Business Consulting, Janesville
- General Business Services, Janesville
- General Consultants, Janesville
- General Freight Trucking, Janesville - Motor Freight
- General Hardware Stores, Janesville
- General Management Consulting Services, Janesville - Management Consultants
- General Merchandise Stores, Janesville
- General Surgeons, Janesville - General Surgery Doctors, Physicians & Surgeons
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- General Travel Agents & Agencies, Janesville
- Generators, Compressors, Pumps, Motors & Fans, Janesville
- Geothermal Heating & Cooling Contractors, Janesville - Geothermal HVAC - Installation
- Geriatricians, Janesville - Geriatric Specialists, Doctors, Physicians & Surgeons
- Gift Baskets, Janesville
- Gift Shops, Janesville - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Janesville
- Gifts, Cards & Stationery Stores, Janesville
- Glass & Glass Products, Janesville
- Glass & Glazing Contractors, Janesville
- Glass - Auto, Float, Plate, Window & Doors, Janesville
- Glass Stained & Leaded, Janesville
- Glass Tinting & Coating, Janesville - Home - Car Window Tinting
- Golf Courses, Janesville
- Golf Equipment & Supplies Stores, Janesville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Janesville
- Government, Janesville
- Grading Contractors, Janesville - Excavating - Excavation Companies
- Graffiti Removal & Protection Services, Janesville
- Grain Elevators, Janesville
- Graphic Design Services, Janesville - Graphic Designer
- Graphic Designer & Artist Services, Janesville
- Grease Traps, Janesville
- Grocery Stores & Supermarkets, Janesville
- Ground Transportation, Except Passenger, Janesville
- Gun Repair & Services, Janesville
- Guns & Gunsmith Services, Janesville
- Gutter Covers, Janesville
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