- Garbage & Rubbish Removal, Jefferson
- Garment & Linen Services, Jefferson
- General Business Consulting, Jefferson
- General Business Services, Jefferson
- General Consultants, Jefferson
- General Hardware Stores, Jefferson
- General Management Consulting Services, Jefferson - Management Consultants
- General Merchandise Stores, Jefferson
- General Travel Agents & Agencies, Jefferson
- Geothermal Heating & Cooling Contractors, Jefferson - Geothermal HVAC - Installation
- Geothermal Heating & Cooling Equipment, Systems & Supplies, Jefferson
- Gift Shops, Jefferson - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Jefferson
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- Glass & Glazing Contractors, Jefferson
- Glazing Contractors, Jefferson - Glass - Window Glazing
- Golf Courses, Jefferson
- Government, Jefferson
- Grain Elevators, Jefferson
- Grain Elevators Equipment Supplies & Repair, Jefferson
- Graphic Design Services, Jefferson - Graphic Designer
- Graphic Designer & Artist Services, Jefferson
- Greeting Card Stores, Jefferson
- Grocery Stores & Supermarkets, Jefferson
- Ground Transportation, Except Passenger, Jefferson
- Gun Repair & Services, Jefferson
- Guns & Gunsmith Services, Jefferson
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